Adjustable arthroplasty devices, systems, and methods

Abstract

An arthroplasty system for replacing a natural articular surface of a bone includes an arthroplasty prosthesis and a bone fixation component. The arthroplasty prosthesis includes a joint-facing side having an articular surface and a bone-facing side having a first adjustable attachment feature. The bone fixation component includes a bone-engaging surface securable to a resected surface of the bone and a second adjustable attachment feature. The first adjustable attachment feature is configured to movably mate with the second adjustable attachment feature, movably mating the bone fixation component to the bone-facing side of the arthroplasty prosthesis.

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates to arthroplasty devices, systems, and methods, and more particularly, to adjustable arthroplasty devices, systems, and methods for the surgical repair of diseased joints. [Background technology]

[0002] Arthroplasty is a surgical procedure in which one or more articular surfaces of a joint are replaced with artificial articular surfaces, and such procedures are becoming increasingly common, particularly for the knee joint.

[0003] A successful knee arthroplasty procedure requires that the knee implant be properly oriented relative to the patient's bone, positioned correctly, and remain in place to avoid subsequent complications and maintain the required wear characteristics. Furthermore, it is desirable that the knee arthroplasty procedure be performed quickly, smoothly, and at low cost. Many existing knee prosthetic implants, systems, and methods require complex, costly, and time-consuming trial-in instruments and associated trial-in procedures, resulting in slow implant times.

[0004] Therefore, infinitely adjustable arthroplasty devices, systems, and methods that can eliminate the need for complex, costly, and time-consuming trial instruments and procedures are desirable. Summary of the Invention [Means for solving the problem]

[0005] The various arthroplasty devices, systems, and methods of the present disclosure have been developed in response to the current state of the art, and particularly in response to problems and needs in the art that have not yet been fully addressed by currently available arthroplasty devices, systems, and methods. In some embodiments, the adjustable arthroplasty devices, systems, and methods of the present disclosure can improve the surgical procedure and repair of diseased joints.

[0006] In some embodiments, an arthroplasty system for replacing a natural articular surface of a bone includes an arthroplasty prosthesis and a bone fixation element. The arthroplasty prosthesis includes a joint-facing side having an articular surface and a bone-facing side having a first adjustable attachment feature. The bone fixation element includes a bone-engaging surface securable to the resected surface of the bone and a second adjustable attachment feature. The first adjustable attachment feature is configured to movably mate with the second adjustable attachment feature to movably mate the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

[0007] In some embodiments, the first adjustable attachment feature comprises a rotation plate coupled to a bone-facing side of the arthroplasty prosthesis, and the second adjustable attachment feature comprises a rotation recess formed in the bone fixation element and configured to receive the rotation plate for rotatably coupling the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

[0008] In some embodiments, the first adjustable attachment feature comprises a rotation recess formed in the bone-facing side of the arthroplasty prosthesis, and the second adjustable attachment feature comprises a rotation plate coupled to the bone fixation element and configured to mate with the rotation recess to rotatably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

[0009] In some embodiments, the first adjustable attachment feature includes a transfer member coupled to the bone-facing side of the arthroplasty prosthesis, and the second adjustable attachment feature includes a transfer coupler configured to movably mate with the transfer member and allow the bone fixation element to move along the transfer member in a first direction relative to the bone-facing side of the arthroplasty prosthesis and in a second direction opposite the first direction relative to the bone-facing side of the arthroplasty prosthesis.

[0010] In some embodiments, the first adjustable attachment feature includes a moving coupler on the bone-facing side of the arthroplasty prosthesis, and the second adjustable attachment feature includes a moving member configured to movably mate with the moving coupler and allow the bone fixation element to move along the moving coupler in a first direction relative to the bone-facing side of the arthroplasty prosthesis and to move along the moving coupler in a second direction opposite the first direction relative to the bone-facing side of the arthroplasty prosthesis.

[0011] In some embodiments, the first adjustable attachment feature includes a rotation recess formed on the bone-facing side of the arthroplasty prosthesis, and the second adjustable attachment feature includes a rotation plate coupled to the bone fixation element and configured to mate with the rotation recess to rotatably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis, the rotation plate further comprising a transfer member coupled to the rotation plate, the bone fixation element further comprising a transfer coupler movably coupled to the transfer member and configured to allow the bone fixation element to move along the transfer member relative to the rotation plate in a first direction and to move along the transfer member relative to the rotation plate in a second direction opposite the first direction.

[0012] In some embodiments, the arthroplasty prosthesis comprises a tibial baseplate, the tibial baseplate comprising a tibial articular surface on an articular-facing side of the tibial baseplate, and the bone fixation element comprises at least one of a keel, a stem, a sleeve, an adapter, and an augment.

[0013] In some embodiments, the arthroplasty prosthesis comprises a femoral prosthesis, the femoral prosthesis comprising a femoral articular surface on an articular-facing side of the femoral prosthesis, and the bone fixation element comprises at least one of a keel, a stem, a sleeve, an adapter, and an augment.

[0014] In some embodiments, a knee arthroplasty system for replacing a natural articular surface of a bone of a knee joint includes a knee arthroplasty prosthesis and a revision bone fixation element. The knee arthroplasty prosthesis includes a joint-facing side including an articular surface and a bone-facing side including a prosthesis attachment feature. The primary bone fixation element includes a bone-engaging surface that allows engagement with a resected surface of the bone and the primary attachment feature. When the primary bone fixation element is secured to the bone, at least a majority of the primary bone fixation element is located outside the intramedullary canal of the bone. The revision bone fixation element includes the revision attachment feature and a stem including a distal portion that is securable in the intramedullary canal of the bone when the revision bone fixation element is secured to the bone. The prosthesis attachment feature is configured to mate with the primary attachment feature to removably couple the primary bone fixation element to the bone-facing side of the knee arthroplasty prosthesis. The prosthesis attachment feature is configured to mate with the revision attachment feature to removably couple the revision bone fixation element to the bone-facing side of the knee arthroplasty prosthesis.

[0015] In some embodiments, the prosthesis attachment feature comprises a prosthesis plate coupled to a bone-facing side of the knee arthroplasty prosthesis, the primary attachment feature comprises a primary recess formed in a primary bone fixation element and configured to removably mate with the prosthesis plate, and the revision attachment feature comprises a revision recess formed in a revision bone fixation element and configured to removably mate with the prosthesis plate.

[0016] In some embodiments, the prosthesis attachment feature comprises a prosthesis recess formed on the bone-facing side of the knee arthroplasty prosthesis, the primary attachment feature comprises a primary plate coupled to the primary bone fixation element and configured to removably mate with the prosthesis recess, and the revision attachment feature comprises a revision plate coupled to the revision bone fixation element and configured to removably mate with the prosthesis recess.

[0017] In some embodiments, the prosthesis attachment feature comprises a prosthesis movement member on a bone-facing side of the knee arthroplasty prosthesis, the primary attachment feature comprises a primary movement coupler configured to removably mate with the prosthesis movement member, and the modification attachment feature comprises a modification movement coupler configured to removably mate with the prosthesis movement member. In some embodiments, the prosthesis attachment feature comprises a prosthesis movement coupler on a bone-facing side of the knee arthroplasty prosthesis, the primary attachment feature comprises a primary movement member configured to removably mate with the prosthesis movement coupler, and the modification attachment feature comprises a modification movement member configured to removably mate with the prosthesis movement coupler.

[0018] In some embodiments, the knee arthroplasty prosthesis includes a tibial baseplate, the tibial baseplate including a tibial articular surface on an articular-facing side of the tibial baseplate, and the primary bone fixation element includes at least one of a short stem, a keel, a sleeve, an adapter, and an augment.

[0019] In some embodiments, the revision bone fixation element further comprises at least one of a keel, a sleeve, an adaptor, and an augment.

[0020] In some embodiments, the knee arthroplasty prosthesis includes a femoral prosthesis, the femoral prosthesis having a femoral articular surface on an articular-facing side of the femoral prosthesis, and the primary bone fixation element includes at least one of a short stem, a keel, a sleeve, an adapter, and an augment.

[0021] In some embodiments, the revision bone fixation element further comprises at least one of a keel, a sleeve, an adaptor, and an augment.

[0022] In some embodiments, a knee arthroplasty system for replacing a natural articular surface on a bone of a knee joint includes a knee arthroplasty prosthesis, a primary bone fixation element, and a revision bone fixation element. The knee arthroplasty prosthesis includes a joint-facing side including an articular surface and a bone-facing side including a prosthesis attachment feature, the bone-facing side including the prosthesis attachment feature formed thereon. The primary bone fixation element includes a primary bone-engaging surface securable to a resected primary surface of the bone and the primary attachment feature. The revision bone fixation element includes a revision bone-engaging surface securable to a resected revision surface of the bone and the revision attachment feature. The prosthesis attachment feature is configured to mate with either the primary attachment feature or the revision attachment feature to couple either the primary bone fixation element or the revision bone fixation element to the bone-facing side of the knee arthroplasty prosthesis. The prosthesis attachment feature is configured to rotatably and / or translatably mate with at least one of the primary attachment feature and the revision attachment feature.

[0023] In some embodiments, the prosthesis attachment feature comprises a prosthesis plate coupled to a bone-facing side of the knee arthroplasty prosthesis, the primary attachment feature comprises a primary recess formed in the primary bone fixation element and configured to rotatably mate with the prosthesis plate, and the revision attachment feature comprises a revision recess formed in the revision bone fixation element and configured to rotatably mate with the prosthesis plate.

[0024] In some embodiments, the prosthesis attachment feature comprises a prosthesis recess formed on a bone-facing side of the knee arthroplasty prosthesis, the primary attachment feature comprises a primary plate coupled to the primary bone fixation element and configured to rotatably mate with the prosthesis recess, and the revision attachment feature comprises a revision plate coupled to the revision bone fixation element and configured to rotatably mate with the prosthesis recess.

[0025] In some embodiments, the prosthesis attachment feature comprises a prosthesis movement member on a bone-facing side of the knee arthroplasty prosthesis, the primary attachment feature comprises a primary movement coupler configured to translatably mate with the prosthesis movement member, and the modification attachment feature comprises a modification movement coupler configured to translatably mate with the prosthesis movement member.

[0026] In some embodiments, the prosthesis attachment feature comprises a prosthesis movement coupler on a bone-facing side of the knee arthroplasty prosthesis, the primary attachment feature comprises a primary movement member configured to translatably mate with the prosthesis movement coupler, and the modification attachment feature comprises a modification movement member configured to translatably mate with the prosthesis movement coupler.

[0027] In some embodiments, the prosthesis attachment feature includes a prosthesis recess formed in the bone-facing side of the knee arthroplasty prosthesis, and the primary attachment feature includes a primary plate coupled to the primary bone fixation element and configured to rotatably mate with the prosthesis recess to rotatably mate the primary bone fixation element to the bone-facing side of the knee arthroplasty prosthesis. The primary plate further includes a primary movement member coupled to the primary plate. The primary bone fixation element further includes a primary movement coupler translatably mated with the primary movement member and configured to enable movement of the primary bone fixation element along the primary movement member in a first direction relative to the primary plate and along the primary movement member in a second direction opposite the first direction relative to the primary plate.

[0028] In some embodiments, the prosthesis attachment feature includes a prosthesis recess formed in the bone-facing side of the knee arthroplasty prosthesis, and the revision attachment feature includes a revision plate coupled to the revision bone fixation element and configured to rotatably couple with the prosthesis recess and rotatably couple the revision bone fixation element to the bone-facing side of the knee arthroplasty prosthesis. The revision plate further includes a revision transfer member coupled to the revision plate. The revision bone fixation element further includes a revision transfer coupler translatably mated with the revision transfer member and configured to enable movement of the revision bone fixation element along the revision transfer member relative to the revision plate in a first direction and movement along the revision transfer member relative to the revision plate in a second direction opposite the first direction.

[0029] In some embodiments, the knee arthroplasty prosthesis comprises a tibial baseplate with a tibial articular surface on the opposing articular side of the tibial baseplate.

[0030] In some embodiments, the knee arthroplasty prosthesis includes a femoral prosthesis having a femoral articular surface on an articular-facing side of said femoral prosthesis.

[0031] In some embodiments, the primary bone fixation element includes at least one of a short stem, a keel, a sleeve, an adaptor, and an augment.

[0032] In some embodiments, at least a majority of the primary bone fixation element is located outside the intramedullary canal of the bone when the primary bone fixation element is secured to said bone.

[0033] In some embodiments, the revision bone fixation element includes a stem, a distal portion of the stem being securable within the intramedullary canal of the bone when the revision bone fixation element is secured to the bone.

[0034] In some embodiments, the revision bone fixation element further comprises at least one of a keel, a sleeve, an adaptor, and an augment.

[0035] In some embodiments, an arthroplasty system for replacing a natural articular surface of a bone includes an arthroplasty prosthesis having an articular-facing side including an articular surface and a bone-facing side including a prosthesis attachment feature, the arthroplasty system includes a bone fixation element having a bone-engaging surface engageable with a resected surface of the bone and an element attachment feature configured to releasably mate with the prosthesis attachment feature to releasably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis, the prosthesis attachment feature including a circular shape having a diameter of at least 10 mm.

[0036] In some embodiments, the prosthesis attachment feature includes a first circular shape having a first diameter of at least 10 mm, the element attachment feature includes a second circular shape having a second diameter of at least 10 mm, and the prosthesis attachment feature and the element attachment feature include complementary circular shapes.

[0037] In some embodiments, the diameter of the circular shape is at least 20 mm.

[0038] In some embodiments, the diameter of the circular shape is at least 30 mm.

[0039] In some embodiments, the prosthesis attachment feature includes a prosthesis plate coupled to the bone-facing side of the arthroplasty prosthesis, and the element attachment feature includes an element recess configured to releasably couple with the prosthesis plate to releasably couple a bone fixation element to the bone-facing side of the arthroplasty prosthesis.

[0040] In some embodiments, the prosthesis attachment feature includes a prosthesis recess formed in the bone-facing side of the arthroplasty prosthesis, and the element attachment feature is configured to releasably couple with the prosthesis recess to releasably couple a bone fixation element to the bone-facing side of the arthroplasty prosthesis, and comprises an element plate coupled to the bone fixation element.

[0041] In some embodiments, the arthroplasty prosthesis comprises a femoral prosthesis comprising a femoral articular surface on an opposing side of the femoral prosthesis.

[0042] In some embodiments, the arthroplasty prosthesis comprises a tibial baseplate comprising a tibial articular surface on an opposing articular side of the tibial baseplate.

[0043] In some embodiments, the tibial baseplate includes at least one first anti-rotation feature formed on the bone-facing side of the tibial baseplate, and the bone fixation element includes at least one second anti-rotation feature configured to removably mate with the first anti-rotation feature and to resist rotation of the bone fixation element relative to the tibial baseplate.

[0044] In some embodiments, the bone fixation element includes at least one of a keel, a stem, a sleeve, an adaptor, and an augment.

[0045] In some embodiments, a method of replacing a natural articular surface of a bone includes movably mating a first adjustable attachment feature of an arthroplasty prosthesis with a second adjustable attachment feature of a bone fixation element to movably fit the bone-facing side of the arthroplasty prosthesis, securing a bone-engaging surface of the bone fixation element to a resected surface of the bone, and replacing the natural articular surface of the bone with the articular surface of the arthroplasty prosthesis.

[0046] In some embodiments, movably mating the first adjustable attachment feature with the second adjustable attachment feature includes inserting a rotation plate of the first adjustable attachment feature into a rotation recess of the second adjustable attachment feature to rotatably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

[0047] In some embodiments, movably mating the first adjustable attachment feature with the second adjustable attachment feature includes inserting a rotation plate of the second adjustable attachment feature into a rotation recess of the first adjustable attachment feature to rotatably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

[0048] In some embodiments, movably mating the first adjustable attachment feature with the second adjustable attachment feature includes mating a moving coupler of the first adjustable attachment feature with a moving member of the second adjustable attachment feature to translatably couple a bone fixation element to a bone-facing side of the arthroplasty prosthesis.

[0049] In some embodiments, movably mating the first adjustable attachment feature with the second adjustable attachment feature includes mating a moving coupler of the second adjustable attachment feature with a moving member of the first adjustable attachment feature to translatably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

[0050] In some embodiments, the step of movably mating the first adjustable attachment feature and the second adjustable attachment feature includes inserting a rotation plate of the second adjustable attachment feature into a rotation recess of the first adjustable attachment feature to rotatably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis, and mating a moving coupler of the bone fixation element with a moving member of the rotation plate to translatably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

[0051] In some embodiments, the method further includes engaging a bone-engaging surface of a bone fixation element with a resected surface of the bone, and transmitting at least one force between the resected surface and the bone-engaging surface to movably self-position the bone fixation element relative to the bone-facing side of the arthroplasty prosthesis.

[0052] In some embodiments, the method further includes activating a locking mechanism to prevent further movement of the bone fixation element relative to the opposing bone side of the arthroplasty prosthesis.

[0053] In some embodiments, a method for replacing a natural articular surface of a bone of a knee joint includes mating a prosthesis attachment feature of a knee joint prosthesis with one of the primary attachment features of a primary bone fixation element and the revision attachment feature of a revision bone fixation element to removably couple the primary bone fixation element and one of the revision bone fixation elements to a bone-facing side of the knee joint prosthesis, securing one of the primary bone-engaging surfaces of the primary bone fixation element and the revision bone-engaging surface of the revision bone fixation element to a resected surface of the bone, and replacing the natural articular surface of the bone with the articular surface of the bone-facing side of the knee joint prosthesis. When the primary bone fixation element is secured to the bone, at least a majority of the primary bone fixation element is located outside the intramedullary canal of the bone. When the revision bone fixation element is secured to the bone, a distal portion of the stem of the revision bone fixation element is securable within the intramedullary canal of the bone.

[0054] In some embodiments, mating the prosthesis attachment feature with one of the primary attachment feature and the revision attachment feature includes inserting a prosthesis plate of the prosthesis attachment feature into one of the primary recess of the primary attachment feature and the revision recess of the revision attachment feature to removably couple the one of the primary bone fixation element and the revision bone fixation element to the bone-facing side of the knee arthroplasty prosthesis.

[0055] In some embodiments, mating the prosthesis attachment feature with one of the primary attachment feature and the revision attachment feature includes mating a prosthesis recess of the prosthesis attachment feature with one of the primary plate of the primary attachment feature and the revision plate of the revision attachment feature to removably couple one of the primary bone fixation element and the revision bone fixation element to a bone-facing side of the knee arthroplasty prosthesis.

[0056] In some embodiments, mating a prosthesis attachment feature with one of the primary attachment feature and the revision attachment feature includes mating a prosthesis movement member of the prosthesis attachment feature with one of the primary movement coupler of the primary attachment feature and the revision movement coupler of the revision attachment feature to releasably couple one of the primary bone fixation element and the revision bone fixation element to a bone-facing side of the knee arthroplasty prosthesis.

[0057] In some embodiments, mating the prosthesis attachment feature with the primary attachment feature and one of the revision attachment features includes mating a prosthesis movement coupler of the prosthesis attachment feature with one of the primary movement members of the primary attachment feature and the revision movement members of the revision attachment feature to releasably couple the one of the primary bone fixation element and the revision bone fixation element to a bone-facing side of the knee arthroplasty prosthesis.

[0058] In some embodiments, the method further includes engaging one of the primary and revision bone-engaging surfaces with the resected surface of the bone, and transmitting at least one force between the resected surface and one of the primary and revision bone-engaging surfaces to movably self-position one of the primary and revision bone fixation elements relative to an opposing bone side of the knee arthroplasty prosthesis.

[0059] In some embodiments, the method further comprises activating a locking mechanism to prevent further movement of one of the primary and revision bone fixation elements relative to the opposing bone side of the knee arthroplasty prosthesis.

[0060] In some embodiments, the knee arthroplasty prosthesis comprises one of a tibial baseplate having a tibial articular surface on an articular-facing side of the tibial baseplate, and a femoral prosthesis having a femoral articular surface on an articular-facing side of the femoral prosthesis. The primary bone fixation element comprises at least one of a short stem, a keel, a sleeve, an adapter, and an augment.

[0061] In some embodiments, the revision bone fixation element further comprises at least one of a keel, a sleeve, an adaptor, and an augment.

[0062] In some embodiments, a method for replacing a natural articular surface of a bone of a knee joint includes selecting one of a primary bone fixation element having a primary bone-engaging surface and a primary attachment feature securable to a resected surface of the bone, and a revision bone fixation element having a revision bone-engaging surface and a revision attachment feature securable to the resected surface of the bone. The method includes rotatably and / or translatably mating a prosthesis attachment feature of the knee joint prosthesis with one of the primary attachment feature and the revision attachment feature to couple the primary bone fixation element or the revision bone fixation element to an opposing bone side of the knee joint prosthesis. The method includes securing the primary bone-engaging surface or the revision bone-engaging surface to the resected surface of the bone, and replacing the natural articular surface of the bone with an articular surface of the opposing joint side of the knee joint prosthesis.

[0063] In some embodiments, the step of rotatably and / or translatably mating the prosthesis attachment feature with either the primary attachment feature or the revision attachment feature includes inserting a prosthesis plate of the prosthesis attachment feature into either the primary recess of the primary attachment feature or the revision recess of the revision attachment feature to couple either the primary bone fixation element or the revision bone fixation element to the bone-facing side of the knee arthroplasty prosthesis.

[0064] In some embodiments, the step of rotatably and / or translatably mating the prosthesis attachment feature with either the primary attachment feature or the revision attachment feature includes mating the prosthesis recess of the prosthesis attachment feature with either the primary plate of the primary attachment feature or the revision plate of the revision attachment feature to couple either the primary bone fixation element or the revision bone fixation element to the bone-facing side of the knee arthroplasty prosthesis.

[0065] In some embodiments, rotatably and / or translatably mating the prosthesis attachment feature with either the primary attachment feature or the revision attachment feature includes mating a prosthesis movement member of the prosthesis attachment feature with either the primary movement coupler of the primary attachment feature or the revision movement coupler of the revision attachment feature to releasably couple either the primary bone fixation element or the revision bone fixation element to the bone-facing side of the knee arthroplasty prosthesis.

[0066] In some embodiments, rotatably and / or translatably mating the prosthesis attachment feature with either the primary attachment feature or the revision attachment feature comprises mating a prosthesis movement coupler of the prosthesis attachment feature with either the primary movement member of the primary attachment feature or the revision movement member of the revision attachment feature to releasably couple either the primary bone fixation element or the revision bone fixation element to the bone-facing side of the knee arthroplasty prosthesis.

[0067] In some embodiments, the method includes engaging one of the primary bone-engaging surface and the revision bone-engaging surface with a resected surface of a bone, and transmitting at least one force between the resected surface and one of the primary bone-engaging surface and the revision bone-engaging surface to movably self-position one of the primary bone fixation element and the revision bone fixation element relative to an opposing bone side of the knee arthroplasty prosthesis.

[0068] In some embodiments, the method further comprises activating a locking mechanism to prevent further movement of either the primary or revision bone fixation elements relative to the opposing bone side of the knee arthroplasty prosthesis.

[0069] In some embodiments, actuating the locking mechanism comprises rotating the locking fastener in a first direction to prevent further movement of either the primary bone fixation element or the revision bone fixation element relative to the opposing bone side of the knee arthroplasty prosthesis.

[0070] In some embodiments, when the primary bone fixation element is secured to the bone, at least a majority of the primary bone fixation element is located outside the intramedullary canal of the bone, and when the revision bone fixation element is secured to the bone, a distal portion of the stem of the revision bone fixation element is securable within the intramedullary canal of the bone.

[0071] In some embodiments, the revision bone fixation element further comprises at least one of a keel, a sleeve, an adaptor, and an augment.

[0072] In some embodiments, the primary bone fixation element comprises at least one of a short stem, a keel, a sleeve, an adaptor, and an augment.

[0073] In some embodiments, the knee arthroplasty prosthesis comprises a tibial baseplate having a tibial articular surface on an articular-facing side of said tibial baseplate.

[0074] In some embodiments, the knee arthroplasty prosthesis comprises a femoral prosthesis comprising a femoral articular surface on an opposing side of the femoral prosthesis.

[0075] In some embodiments, a method for replacing a natural articular surface of a bone comprises removably coupling a prosthesis attachment feature of an arthroplasty prosthesis with an element attachment feature of a bone fixation element to removably couple the bone fixation element to a bone-facing side of the arthroplasty prosthesis. The method also comprises securing a bone-engaging surface of the bone fixation element to a resected surface of the bone and replacing the natural articular surface of the bone with the articular surface of the arthroplasty prosthesis. The prosthesis attachment feature comprises a circular shape having a diameter of at least 10 mm.

[0076] In some embodiments, the prosthesis attachment feature comprises a first circular shape having a first diameter of at least 10 mm, the element attachment feature comprises a second circular shape having a second diameter of at least 10 mm, and the prosthesis attachment feature and the element attachment feature comprise complementary circular shapes.

[0077] In some embodiments, the diameter of the circular shape is at least 20 mm.

[0078] In some embodiments, the diameter of the circular shape is at least 30 mm.

[0079] In some embodiments, releasably mating the prosthesis attachment feature with the element attachment feature comprises inserting a prosthesis plate of the prosthesis attachment feature into an element recess of the element attachment feature to releasably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

[0080] In some embodiments, the method further comprises engaging the engagement surface with a resection surface of the bone and transmitting at least one force between the resection surface and the bone engagement surface to movably self-position the bone fixation element relative to the bone-facing side of the arthroplasty prosthesis.

[0081] In some embodiments, the method further comprises activating a locking mechanism to prevent further movement of the bone fixation element relative to the opposing bone side of the arthroplasty prosthesis.

[0082] In some embodiments, actuating the locking mechanism includes rotating the locking fastener in a first direction to prevent further movement of the bone fixation element relative to the opposing bone side of the arthroplasty prosthesis.

[0083] In some embodiments, the method further comprises engaging at least one first anti-rotation feature of the arthroplasty prosthesis with at least one second anti-rotation feature of the bone fixation element to resist rotation of the bone fixation element relative to the opposing bone side of the arthroplasty prosthesis.

[0084] In some embodiments, the arthroplasty prosthesis comprises one of a tibial baseplate, the tibial baseplate comprising a tibial articular surface on an articular-facing side of the tibial baseplate, and a femoral prosthesis, the femoral prosthesis comprising a femoral articular surface on an articular-facing side of the femoral prosthesis, and the bone fixation element comprises at least one of a stem, a keel, a sleeve, an adapter, and an augment.

[0085] These and other features and advantages of the present disclosure will become more fully apparent from the following description and appended claims, or may be learned by the practice of the prosthetic devices, systems, and methods described hereinafter. [Brief explanation of the drawings]

[0086] Exemplary embodiments of the present disclosure will become more fully apparent from the following description taken in conjunction with the accompanying drawings, in which: It will be understood that these drawings depict exemplary embodiments only and are therefore not intended to limit the scope of the disclosure, and exemplary embodiments of the present disclosure will be described with additional specificity and detail using the accompanying drawings in which: [Figure 1]1 illustrates an exploded view of an arthroplasty system according to an embodiment of the present disclosure. [Figure 2] 2 shows a front perspective view of the arthroplasty system of FIG. 1 after assembly. [Figure 3] 3 shows a rear perspective view of the arthroplasty system of FIG. 2. [Figure 4A] 1 illustrates a top perspective view of a tibial baseplate according to an embodiment of the present disclosure. [Figure 4B] 4B shows a bottom perspective view of the tibial baseplate of FIG. 4A. [Figure 4C] 4B shows a top view of the tibial baseplate of FIG. 4A. [Figure 4D] FIG. 4B shows a bottom view of the tibial baseplate of FIG. 4A. [Figure 5A] 1 illustrates a front view of a keel according to an embodiment of the present disclosure. [Figure 5B] 5B shows a side view of the keel of FIG. 5A. [Figure 5C] 5B shows a top view of the keel of FIG. 5A. [Figure 5D] 5B shows a bottom view of the keel of FIG. 5A. [Figure 6] 10 shows an exploded view of an arthroplasty system according to another embodiment of the present disclosure. [Figure 7] FIG. 7 shows a front perspective view of the arthroplasty system of FIG. 6 after assembly. [Figure 8] 8 shows a rear perspective view of the arthroplasty system of FIG. 7. [Figure 9A] FIG. 10 shows a front view of a low-profile keel according to another embodiment of the present disclosure. [Figure 9B] 9B shows a side view of the low-profile keel of FIG. 9A. [Figure 9C] 9B shows a top view of the low-profile keel of FIG. 9A. [Figure 9D] 9B shows a bottom view of the low-profile keel of FIG. 9A. [Figure 10] 10 shows an exploded view of an arthroplasty system according to another embodiment of the present disclosure. [Figure 11] 11 shows a perspective view of the arthroplasty system of FIG. 10 after assembly. [Figure 12]12 shows a perspective view of the arthroplasty system of FIG. 11. [Figure 13] 13 shows a cross-sectional view of the arthroplasty system of FIG. 12. [Figure 14A] 10 illustrates a bottom perspective view of an element attachment feature according to an embodiment of the present disclosure. [Figure 14B] FIG. 14B shows a side view of the element attachment feature of FIG. 14A. [Figure 14C] FIG. 14B illustrates a top view of the element attachment feature of FIG. 14A. [Figure 14D] FIG. 14B illustrates a bottom view of the element attachment feature of FIG. 14A. [Figure 15A] FIG. 1 illustrates a perspective view of a stem adapter according to an embodiment of the present disclosure. [Figure 15B] 15B shows another perspective view of the stem adapter of FIG. 15A. [Figure 15C] 15B shows a top view of the stem adapter of FIG. 15A. [Figure 15D] 15B shows a side view of the stem adapter of FIG. 15A. [Figure 16] 10 shows an exploded view of an arthroplasty system according to another embodiment of the present disclosure. [Figure 17] 17 shows a bottom perspective view of the arthroplasty system of FIG. 16 after assembly. [Figure 18] FIG. 18 shows a front view of the arthroplasty system of FIG. 17. [Figure 19] 18 shows a bottom view of the arthroplasty system of FIG. 17. [Figure 20] 10 shows an exploded view of an arthroplasty system according to another embodiment of the present disclosure. [Figure 21] 21 shows an assembled perspective view of the arthroplasty system of FIG. 20. [Figure 22A] 1 shows a perspective view of a conical sleeve according to an embodiment of the present disclosure. [Figure 22B] 22B shows a side view of the conical sleeve of FIG. 22A. [Figure 22C] 22B shows a top view of the conical sleeve of FIG. 22A. [Figure 22D] 22B shows a bottom view of the conical sleeve of FIG. 22A. [Figure 23]10 shows an exploded view of an arthroplasty system according to another embodiment of the present disclosure. [Figure 24] FIG. 24 shows a perspective view of the arthroplasty system of FIG. 23 after assembly. [Figure 25A] FIG. 10 shows a perspective view of an oblong sleeve according to another embodiment of the present disclosure. [Figure 25B] A side view of the oval sleeve of 25A is shown. [Figure 25C] 25B shows a top view of the oval sleeve of FIG. 25A. [Figure 25D] 25B shows a bottom view of the oval sleeve of FIG. 25A. [Figure 26A] 1 shows a perspective view of a broach according to an embodiment of the present disclosure. [Figure 26B] 26B shows another perspective view of the broach of FIG. 26A. [Figure 26C] 26B shows a side view of the broach of FIG. 26A. [Figure 26D] 26B shows a bottom view of the broach of FIG. 26A. [Figure 27] 10 shows an exploded view of an arthroplasty system according to another embodiment of the present disclosure. [Figure 28] 28 shows a perspective view of the arthroplasty system of FIG. 27 after assembly. [Figure 29A] 1 shows a lateral side view of a femoral prosthesis according to an embodiment of the present disclosure. [Figure 29B] 29B shows a rear view of the femoral prosthesis of FIG. 29A. [Figure 29C] 29B shows a medial side view of the femoral prosthesis of FIG. 29A. [Figure 29D] 29B shows a front view of the femoral prosthesis of FIG. 29A. [Figure 29E] 29B shows a top view of the femoral prosthesis of FIG. 29A. [Figure 29F] 29B shows a bottom view of the femoral prosthesis of FIG. 29A. [Figure 30] 10 shows an exploded view of an arthroplasty system according to another embodiment of the present disclosure. [Figure 31] 31 shows a perspective view of the arthroplasty system of FIG. 30 after assembly.

[0087] Please note that the drawings are created to illustrate the concepts of the present disclosure, may not be drawn to scale, depict exemplary embodiments, and are not intended to limit the scope of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0088] Exemplary embodiments of the present disclosure will be best understood by reference to the drawings, in which like parts are designated with like numerals throughout. It will be readily understood that the components of the present disclosure, as generally described and illustrated in the drawings, could be arranged and designed in a wide variety of configurations. Thus, the following more detailed description of embodiments of devices, systems, and methods that are represented in the drawings is not intended to limit the scope of the present disclosure, but merely represent exemplary embodiments of the present disclosure.

[0089] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While various aspects of the embodiments are illustrated in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0090] Standard medical reference surfaces and descriptive terminology are employed herein. These terms are used generally to refer to the human body, although certain terms can be applied to physical objects in general.

[0091] A standard system of three mutually perpendicular reference planes is employed: The sagittal plane divides the body into right and left sides. The coronal plane divides the body into anterior and posterior parts. The transverse plane divides the body into superior and inferior parts. The midsagittal, midcoronal, or midtransverse planes divide the body into symmetrical equal parts. The intersection of the sagittal and coronal planes defines the superior-inferior or craniocaudal axis. The intersection of the sagittal and transverse planes defines the anterior-posterior axis. The intersection of the coronal and transverse planes defines the mediolateral axis. The superior-inferior or craniocaudal axis, the anterior-posterior axis, and the mediolateral axis are mutually perpendicular.

[0092] Anterior means toward the front of the body. Posterior means toward the back of the body. Superior or cephalad means toward the head. Inferior or caudal means toward the feet or tail. Medial means toward the midline of the body, especially toward the bilateral plane of symmetry of the body. Lateral means away from the midline of the body or away from the bilateral plane of symmetry of the body. Axial means toward the central axis of the body. Dorsal means away from the central axis of the body. Ipsilateral means the same side of the body. Contralateral means the opposite side of the body. Proximal means toward the trunk of the body. Proximal can also mean toward the user or operator. Distal can also mean away from the trunk. Distal can also mean away from the user or operator. Dorsal means toward the top of the foot. Plantar means toward the bottom of the foot. Inversion refers to the inward deflection of the distal portion of the leg below the knee, resulting in a bow-legged appearance. Eversion refers to the outward deflection of the distal portion of the leg below the knee, resulting in a bowed appearance.

[0093] As defined herein, the terms "arthroplasty prosthesis" and "arthroplasty system" (and their variants) include any prosthesis or arthroplasty system that includes bone counterparts that can be implanted within, adjacent to, or near the bone of a patient or animal. Thus, the terms "arthroplasty prosthesis" and "arthroplasty system" include prostheses or arthroplasty systems that may or may not be utilized to repair a diseased joint in a patient or animal.

[0094] As defined herein, the term "bone fixation element" (and similar terms) includes a prosthesis including at least one bone-engaging surface (or at least one bone cement-engaging surface, or at least one bone augmentation material-engaging surface, etc.), or a prosthesis coupled (directly or indirectly) to or supporting another element of a prosthesis including at least one bone-engaging surface (or at least one bone cement-engaging surface, or at least one bone augmentation material-engaging surface, etc.) that is implantable within, adjacent to, or near the bone of a patient or animal. Thus, the term "bone fixation element" can include any stem (short stem, long stem, mid-stem, etc.), intramedullary rod, keel, sleeve, adapter, augment, etc., having any size, shape, feature, configuration, etc., described or contemplated herein, as well as any stem (short stem, long stem, etc.), intramedullary rod, keel, sleeve, adapter, augment, etc., having any size, shape, feature, configuration, etc., not described or contemplated herein.

[0095] Although the arthroplasty prostheses and systems described herein are disclosed in connection with knee replacement prostheses and systems, those skilled in the art will readily appreciate that the inventive concepts described and discussed herein may be applied to any prosthesis or arthroplasty system for any bone or joint of a patient or animal, including, but not limited to, bones / joints of the foot, ankle, knee, hip, hand, wrist, elbow, shoulder, sacrum, spine, neck, etc., without departing from the spirit or scope of the present invention.

[0096] It will also be understood that any component or feature of any arthroplasty system described or discussed herein can be combined with any other component or feature described or discussed herein to create any number of different arthroplasty system embodiments.

[0097] It will also be understood that any component or feature of any arthroplasty system described or discussed herein can be combined with any other component or feature described or discussed herein to create any number of different surgical kits, each of which may or may not include any number of supporting surgical instruments or general components (e.g., bone screws, fasteners, K-wires, etc.).

[0098] It will further be understood that any method step (or component / feature of any method step) described or discussed herein can be combined in any order and / or in any combination with any other method step (or component / feature of any method step) described or discussed herein to create any number of different method embodiments for implanting any number of different arthroplasty system embodiments described or discussed herein.

[0099] Figures 1-5D show various views of an arthroplasty system according to embodiments of the present disclosure. Specifically, Figure 1 is an exploded view of the arthroplasty system, Figure 2 is a front perspective view of the assembled arthroplasty system, Figure 3 is a rear perspective view of the arthroplasty system, Figure 4A is a top perspective view of a tibial baseplate of the arthroplasty system, Figure 4B is a bottom perspective view of the tibial baseplate, Figure 4C is a top view of the tibial baseplate, Figure 4D is a bottom view of the tibial baseplate, Figure 5A is a front view of a keel of the arthroplasty system, Figure 5B is a side view of the keel, Figure 5C is a top view of the keel, and Figure 5D is a bottom view of the keel.

[0100] In some embodiments, the arthroplasty system of FIGS. 1-5D generally includes a tibial baseplate 100, a keel 200, and a locking fastener 50.

[0101] In some embodiments, the locking fastener 50 includes a locking fastener torque connection interface 59 and a locking fastener screw 58 .

[0102] In some embodiments, the tibial baseplate 100 may be a universal tibial baseplate that is compatible with some or all of the other bone fixation elements described or discussed herein.

[0103] The tibial baseplate 100 is also referred to herein as an arthroplasty prosthesis or knee arthroplasty prosthesis. The tibial baseplate 100 generally includes a joint-facing side 1, a bone-facing side 2, a peripheral ridge 110, an internal recess 112, an alcove 114, and at least one first anti-rotation feature 61 (or first anti-rotation hole / first augmentation hole).

[0104] In some embodiments, the articular-facing side 1 of the tibial baseplate 100 may include a tibial articular surface, such as the tibial articular surface of a tibial insert (not shown), which may be matable with the internal recess 112 of the tibial baseplate 100 and held in place by the alcove 114 and / or peripheral ridge 110 of the tibial baseplate 100. However, in other embodiments, the articular-facing side 1 of the tibial baseplate 100 may directly incorporate a tibial articular surface (not shown), which may be integrally formed with the tibial baseplate 100.

[0105] In some embodiments, the bone-facing side 2 of the tibial baseplate 100 includes a bone-engaging surface 4 (see, e.g., FIGS. 20 and 21 ). The bone-engaging surface 4 is also referred to herein as a primary bone-engaging surface or a modified bone-engaging surface. In some embodiments, the bone-engaging surface 4 of the tibial baseplate 100 includes a porous surface coating 5 (see, e.g., FIGS. 20 and 21 ). In some embodiments, the porous surface coating 5 may be an additional surface coating (e.g., a porous titanium surface, or other porous metal surface), a nanocoating, or other treatment that may be configured to promote bone ingrowth in cementless (or cemented) applications.

[0106] In some embodiments, the bone-facing side 2 of the tibial baseplate 100 may not include a bone-engaging surface.

[0107] In some embodiments, the bone-facing side 2 of the tibial baseplate 100 may be for use with bone cement, bone augmentation materials, or the like.

[0108] In some embodiments, the bone-facing side 2 of the tibial baseplate 100 includes at least one post 190 (see, for example, Figures 20 and 21) that can protrude downwardly from the bone-facing side 2 of the tibial baseplate 100.

[0109] As shown in FIG. 1, in some embodiments, the tibial baseplate 100 may include a prosthetic attachment feature 10 or a first adjustable attachment feature on the bone-facing side 2 of the tibial baseplate 100.

[0110] In some embodiments, the prosthesis attachment feature 10 may be formed on the bone-facing side 2 of the tibial baseplate 100. The prosthesis attachment feature 10 may include a rotation recess 15 having a recess surface 11, recess sidewalls 12, recess fastening holes 13, and a recess diameter 14. The rotation recess 15 is also referred to herein as a prosthesis recess, element recess, primary recess, or modification recess. However, in some embodiments, the prosthesis attachment feature 10 of the tibial baseplate 100 may include a rotation plate, as described in more detail below.

[0111] Continuing with FIGS. 1-5D, the keel 200 is also referred to herein as a bone fixation element, a primary bone fixation element, or a revision bone fixation element.

[0112] In some embodiments, the keel 200 generally includes a first keel web 201, a second keel web 202, a central keel post 203, a keel bore 244, a keel bore screw 205, and one or more keel ribs 210 or crenellations formed on the bone-engaging surface 4 of the keel 200.

[0113] In some embodiments, the keel 200 includes at least one second anti-rotation feature 62 and an element attachment feature 20 coupled to or formed within the proximal end of the keel 200.

[0114] In some embodiments, the at least one second anti-rotation feature 62 is tapered and is received within the at least one first anti-rotation feature 61 formed in the tibial baseplate 100 to form a tapered connection that can prevent relative rotation between the keel 200 and the tibial baseplate 100, as will be described in more detail below.

[0115] Element attachment feature 20 is also referred to herein as a second adjustable attachment feature, a primary attachment feature, or a modified attachment feature.

[0116] In some embodiments, the element attachment feature 20 includes a rotating plate 25 having a plate diameter 24 , a prosthesis-facing surface 21 , an element-facing surface 22 , and a plate sidewall 23 .

[0117] However, in other embodiments, the structure of element attachment feature 20 and prosthesis attachment feature 10 may be reversed, such that element attachment feature 20 includes rotation recess 15 and prosthesis attachment feature 10 includes rotation plate 25. Thus, in some embodiments, prosthesis attachment feature 10 and element attachment feature 20 may include complementary circular shapes.

[0118] The rotating plate 25 is also referred to herein as a prosthetic plate, component plate, primary plate, or revision plate.

[0119] In some embodiments, the prosthesis attachment feature 10 may include a circular shape having a diameter of at least 10 mm.

[0120] In some embodiments, the prosthesis attachment feature 10 may include a circular shape having a diameter of at least 20 mm.

[0121] In some embodiments, the prosthesis attachment feature 10 may include a circular shape having a diameter of at least 30 mm.

[0122] In some embodiments, the prosthesis attachment feature 10 may include a circular shape having a diameter of at least 40 mm.

[0123] In some embodiments, the prosthesis attachment feature 10 may include a circular shape having a diameter of at least 50 mm.

[0124] However, in some embodiments, the prosthesis attachment feature 10 may also include a circular shape with a diameter of less than 10 mm.

[0125] As shown in Figures 1-5D, in some embodiments, the element attachment feature 20 may be configured to removably mate with the prosthesis attachment feature 10 to removably couple the bone fixation element to the bone-facing side 2 of the arthroplasty prosthesis.

[0126] In some embodiments, the first adjustable attachment feature or prosthesis attachment feature 10 includes a rotation recess 15 formed in the bone-facing side 2 of the arthroplasty prosthesis, and the second adjustable attachment feature or element attachment feature 20 includes a rotation plate 25 coupled to the bone fixation element and configured to removably mate with the rotation recess 15. In these embodiments, the at least one second anti-rotation feature 62 of the keel 200 is configured to mate with the at least one first anti-rotation feature 61 of the tibial baseplate 100 to prevent relative rotation between the keel 200 and the tibial baseplate 100 after assembly with the locking fasteners 50 coupling the tibial baseplate 100 to the keel 200, so that the keel 200 does not move / rotate relative to the tibial baseplate 100.

[0127] In some embodiments, the arthroplasty system of Figures 1-5D can be utilized in primary knee arthroplasty procedures that do not require a stem or intramedullary rod for additional stability. However, it will be appreciated that the arthroplasty system of Figures 6-9D can also be utilized in revision knee arthroplasty procedures.

[0128] In some embodiments, the first adjustable attachment feature or prosthesis attachment feature 10 is configured to movably mate with the second adjustable attachment feature or element attachment feature 20 to movably couple a bone fixation element, such as a keel 200, to the bone opposing side 2 of an arthroplasty prosthesis, such as a tibial baseplate 100.

[0129] In some embodiments, the first adjustable attachment feature may include a rotation recess 15 formed in the bone-facing side 2 of the arthroplasty prosthesis, and the second adjustable attachment feature may include a rotation plate 25 coupled to the bone fixation element and configured to mate with the rotation recess 15 to rotatably couple the bone fixation element to the bone-facing side 2 of the arthroplasty prosthesis. For example, at least one of the first and / or second anti-rotation features may be omitted to allow for a rotatable coupling between the keel 200 and the tibial baseplate 100.

[0130] In some embodiments, the first adjustable attachment feature can include a rotation plate 25 coupled to the bone-facing side 2 of the arthroplasty prosthesis, and the second adjustable attachment feature can include a rotation recess 15 formed in the bone fixation element and configured to receive the rotation plate 25 and rotatably couple the bone fixation element to the bone-facing side 2 of the arthroplasty prosthesis.

[0131] 6-9D show various views of an arthroplasty system or knee arthroplasty system according to another embodiment of the present disclosure. Specifically, FIG. 6 is an exploded view of the arthroplasty system, FIG. 7 is a front perspective view of the assembled arthroplasty system, FIG. 8 is a rear perspective view of the arthroplasty system, FIG. 9A is a front view of a low-profile keel of the arthroplasty system, FIG. 9B is a side view of the low-profile keel, FIG. 9C is a top view of the low-profile keel, and FIG. 9D is a bottom view of the low-profile keel. In some embodiments, the arthroplasty system of FIGS. 6-9D can generally include a locking fastener 50, a tibial baseplate 100, and a low-profile keel 250.

[0132] In some embodiments, the locking fastener 50 and tibial baseplate 100 may include the same / similar features as other locking fasteners and tibial baseplates described herein.

[0133] In some embodiments, the low profile keel 250 may have similar features to the keel 200, but may have a reduced height.

[0134] In some embodiments, the low-profile keel 250 may generally include a bone-engaging surface 4, a first low-profile keel web 251, a second low-profile keel web 252, a low-profile central keel post 253, a low-profile keel bore 294, a keel bore screw 255, at least one second anti-rotation feature 62, an element attachment feature 20, and one or more low-profile keel ribs 260 or crenellations formed on the bone-engaging surface 4.

[0135] In some embodiments, the arthroplasty system of Figures 6-9D can be utilized in primary knee arthroplasty procedures that do not require a stem or intramedullary rod for additional stability. However, it will be appreciated that the arthroplasty system of Figures 6-9D can also be utilized in revision knee arthroplasty procedures.

[0136] In some embodiments, the knee arthroplasty systems of FIGS. 6-9D can be implanted into a knee joint from a lateral approach using a minimally invasive surgical procedure. The low overall height of the low-profile keel 250 facilitates surgical procedures using the lateral approach. In some embodiments, the low-profile keel 250 is first implanted into a prepared tibia from the lateral approach, and then the tibial baseplate 100 is inserted into the surgical site from the lateral approach and coupled to the installed low-profile keel 250. However, it will be understood that any of the arthroplasty systems described or discussed herein can be implanted into any joint or bone from an anterior direction, a posterior direction, a lateral direction, a medial direction, an inferior direction, a superior direction, etc., and / or any combination thereof (e.g., posterolateral, anteromedial, etc.).

[0137]

[0023] Figures 10-15D show various views of an arthroplasty system or knee arthroplasty system according to another embodiment of the present disclosure. Specifically, Figure 10 is an exploded view of the arthroplasty system. Figure 11 is a perspective view of the assembled arthroplasty system. Figure 12 is another perspective view of the arthroplasty system. Figure 13 is a cross-sectional view of the arthroplasty system of Figure 12. Figure 14A is a bottom perspective view of an element attachment feature of the arthroplasty system. Figure 14B is a side view of the element attachment feature. Figure 14C is a top view of the element attachment feature. Figure 14D is a bottom view of the element attachment feature. Figure 15A is a perspective view of a stem adapter of the arthroplasty system. Figure 15B is another perspective view of the stem adapter. Figure 15C is a top view of the stem adapter, and Figure 15D is a side view of the stem adapter.

[0138] In some embodiments, the arthroplasty system of FIGS. 10-15D can generally include a locking fastener 50, a tibial baseplate 100, an element attachment feature 20 (which in some embodiments may form one or more separate components), a stem adaptor 300 or bone fixation element / adaptor, and a stem 400.

[0139] In some embodiments, the locking fastener 50 and tibial baseplate 100 may include the same or similar features as other locking fasteners and tibial baseplates described herein.

[0140] In some embodiments, the stem 400 can include a proximal portion 401 including stem threads 408, a distal portion 402, and a bone-engaging surface 4 that may or may not include one or more splines 410 or ribs and that may or may not have a porous surface coating.

[0141] In some embodiments, the arthroplasty system of Figures 10-15D can be utilized in revision knee arthroplasty procedures that may require a stem 400 or an intramedullary rod for additional stability. However, it will be understood that the arthroplasty system of Figures 10-15D can also be utilized in primary knee arthroplasty procedures.

[0142] In some embodiments, the element attachment feature 20 can include a rotation plate 25, a transfer member 30 that can be coupled to the element-facing surface 22 of the rotation plate 25, and a transfer coupler 40 formed within one or more bone fixation elements described or discussed herein (e.g., the stem adapter 300 in the embodiment shown in Figures 10-15D).

[0143] Herein, the transfer member 30 is also referred to as a prosthetic transfer member, a primary transfer member, or a corrective transfer member.

[0144] Herein, the moving coupler 40 is also referred to as a prosthetic moving coupler, a primary moving coupler, or a modified moving coupler.

[0145] In some embodiments, the transfer member 30 includes a transfer member body 35 that protrudes from the element-facing surface 22 of the rotating plate 25 and a fastening hole 37 formed therein.

[0146] In some embodiments, the transfer member body 35 comprises an elongated shape that may or may not extend across the entire diameter of the rotating plate 25 .

[0147] In some embodiments, the transfer member body 35 may have an elongated shape that can extend beyond the plate diameter 24 of the rotating plate 25 (see, for example, Figures 27 and 28, where the transfer member 30 includes a protrusion 36 on at least one side of the rotating plate 25 that extends beyond the plate diameter 24 of the rotating plate 25).

[0148] 10-15D, the moving member 30 may also include a first moving member arm 31 that protrudes from a distal portion of the moving member body 35 along a first direction that extends alongside and / or generally parallel to the rotating plate 25. The moving member 30 may also include a second moving member arm 32 that protrudes from the distal portion of the moving member body 35 along a second direction opposite to the first direction that extends alongside and / or generally parallel to the rotating plate 25.

[0149] In other embodiments, the transfer member 30 may include an elongated coupling slot (not shown) formed in the rotating plate 25 instead of a transfer member body 35 protruding from the rotating plate 25. In these embodiments, the elongated coupling slot may be configured to translatably couple with a bone fixation element to translatably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

[0150] In some embodiments, the stem 400 can include a moving coupler 40 (not shown) formed at the proximal end of the stem 400 .

[0151] In some embodiments, the stem adapter 300 can include a moving coupler 40 formed at the proximal end of the stem adapter 300, a bone-engaging surface 4 that may or may not include a porous surface coating, a stem adapter bore 344, and a stem adapter thread 308.

[0152] The configuration of the moving coupler 40 may be formed within the stem adapter 300 and / or within other elements of the present disclosure, as will be described in more detail below with reference to Figures 22A-22D and 25A-25D.

[0153] 22A-22D and 25A-25D, the moving coupler 40 formed on the stem adapter 300 can generally include a first moving coupler arm 41, a second moving coupler arm 42, a moving coupler arm slot 43, a moving coupler body slot 45, and a moving coupler locking surface 46, as shown in FIGS.

[0154] The moving coupler arm slot 43 may be configured to accommodate the first moving member arm 31 and the second moving member arm 32 of the moving member 30, and the moving coupler body slot 45 may be configured to accommodate the proximal / thinned portion of the moving member body 35. In this manner, the stem adapter 300 may be configured to slidably couple and / or translatably mate with the moving member 30, as shown in FIG.

[0155] In some embodiments, the rotating plate 25 includes a transfer member 30 coupled to the rotating plate 25, and the bone fixation element (e.g., stem adaptor 300 and / or stem 400 in this embodiment) can include a transfer coupler 40 configured to movably couple to the transfer member 30 to allow the bone fixation element to move along the transfer member 30 in a first direction relative to the rotating plate 25 and to move along the transfer member 30 in a second direction opposite the first direction relative to the rotating plate 25. In these embodiments, the first adjustable attachment feature or prosthesis attachment feature 10 also includes a rotation recess 15 formed on the bone-facing side of the arthroplasty prosthesis, and the second adjustable attachment feature or element attachment feature 20 can include a rotating plate 25 that can be coupled to the bone fixation element (e.g., stem adaptor 300 and / or stem 400), with the rotation plate 25 configured to mate with the rotation recess 15 to rotatably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

[0156] In this manner, the bone fixation element (e.g., stem adapter 300 and / or stem 400) can be rotatably and / or translatably mated with the bone-facing side 2 of the tibial baseplate 100. This arrangement allows the stem adapter 300 and / or stem 400 to be positioned relative to the bone-facing side 2 of the tibial baseplate 100 along an infinite number of different rotational and / or translational positions (e.g., rotational positions along 360 degrees or rotational positions and / or translational positions along the length of travel 40) to achieve a precise desired position of the bone fixation element relative to the bone-facing side of the arthroplasty prosthesis.

[0157] Once the desired position of the bone fixation element relative to the bone-facing side of the arthroplasty prosthesis is achieved, this desired position can be secured in place by tightening the locking fasteners 50, as shown in Figures 1 and 2. For example, when the locking fasteners 50 are tightened, the distal ends of the locking fasteners 50 press against the moving coupler locking surfaces 46, forcing the first and second moving coupler arms of the moving coupler 40 against the first and second moving member arms of the transfer member 30. This frictionally locks the stem adapter 300 relative to the transfer member 30, preventing the stem adapter 300 from moving along the transfer member 30. Furthermore, tightening the locking fasteners 50 also tightens the rotation plate 25 against the rotation recess 15 formed in the tibial baseplate 100, preventing the stem adapter 300 (and / or stem 400) from rotating relative to the bone-facing side 2 of the tibial baseplate 100.

[0158] In some embodiments, the locking fastener 50 can be loosened to allow the stem 400 to rotate and / or translate relative to the bone-facing side 2 of the tibial baseplate 100. In this state, the stem 400 can be inserted into a prepared bone tunnel or resected bone, with the bone-engaging surface 4 of the stem 400 engaging a resected surface of the bone (e.g., the surface of a bone tunnel formed in the bone to receive the stem 400; the diameter of this surface may be slightly smaller than the diameter of the stem 400 to ensure a good press-fit). Further forcing of the stem 400 into the bone tunnel transfers at least one force between the resected surface of the bone and the bone-engaging surface 4 of the stem 400, potentially causing the stem 400 to movably self-align or self-position relative to the bone-facing side 2 of the tibial baseplate 100 as the stem is forced into the bone tunnel. The operator can also grasp the tibial baseplate 100 and manually move it relative to the stem 400 in the bone tunnel to further adjust the position of the tibial baseplate 100 relative to the bone-facing side 2 of the tibial baseplate 100, if necessary. Once the desired position of the bone fixation element relative to the bone-facing side of the arthroplasty prosthesis is achieved, the desired position is locked in place by tightening the locking fasteners 50, as described above. In this manner, the self-adjusting and / or adjustable arthroplasty system of the present disclosure can eliminate the need for a trial instrument and / or the need to perform one or more trial procedures to select a "best fit" or "most personalized" prosthesis from among multiple different prostheses in a kit (e.g., each individual prosthesis may include a different personalized rotational position, shape, or configuration, and / or a different personalized offset position, shape, or configuration).

[0159] In other embodiments, the structure of the second adjustable attachment feature or element attachment feature 20 and the first adjustable attachment feature or prosthesis attachment feature 10 may be reversed, with the first adjustable attachment feature including a moving coupler 40 on the bone-facing side of the arthroplasty prosthesis and the second adjustable attachment feature including a moving member 30 configured to movably mate with the moving coupler 40 and allow the bone fixation element to move along the moving coupler 40 in a first direction relative to the bone-facing side of the arthroplasty prosthesis and to move along the moving coupler in a second direction opposite the first direction relative to the bone-facing side of the arthroplasty prosthesis.

[0160] In some embodiments, a knee arthroplasty system for replacing a natural articular surface of a bone of a knee joint may include a knee arthroplasty prosthesis, a primary bone fixation element, and a revision bone fixation element. The knee arthroplasty prosthesis includes a joint-facing side having an articular surface and a bone-facing side having a prosthesis attachment feature. The primary bone fixation element includes a primary bone-engaging surface attachable to a resected surface of the bone and the primary attachment feature. When the primary bone fixation element is secured to the bone, at least a majority of the primary bone fixation element is positioned outside the intramedullary canal of the bone. The revision bone fixation element includes the revision attachment feature and a stem having a distal portion securable within the intramedullary canal of the bone when the revision bone fixation element is secured to the bone. The prosthesis attachment feature may be configured to mate with the primary attachment feature to removably couple the primary bone fixation element to the bone-facing side of the knee arthroplasty prosthesis. The prosthesis attachment feature is configured to mate with the revision attachment feature to removably couple the revision bone fixation element to the bone-facing side of the knee arthroplasty prosthesis.

[0161] In some embodiments, a knee arthroplasty system for replacing a natural articular surface of a bone of a knee joint includes a knee arthroplasty prosthesis, a primary bone fixation element, and a revision bone fixation element. The primary bone fixation element includes an articulation-facing surface having an articulation surface and a bone-facing surface having a prosthesis attachment feature formed thereon. The primary bone fixation element includes a primary bone-engaging surface securable to a resected primary surface of the bone and a primary attachment feature. The revision bone fixation component may include a revision bone-engaging surface securable to a resected revised surface of the bone and a revision attachment feature. The prosthesis attachment feature may be configured to mate with either the primary attachment feature or the revision attachment feature to couple either the primary bone fixation element or the revision bone fixation element to the bone-facing surface of the knee arthroplasty prosthesis. The prosthesis attachment feature may be configured to rotatably and / or translatably mate with at least one of the primary attachment feature and the revision attachment feature.

[0162] 16-19 show various views of an arthroplasty system or knee arthroplasty system according to another embodiment of the present disclosure. Specifically, FIG. 16 is an exploded view of the arthroplasty system, FIG. 17 is a bottom perspective view of the assembled arthroplasty system, FIG. 18 is a front view of the arthroplasty system, and FIG. 19 is a bottom view of the arthroplasty system.

[0163] In some embodiments, the prosthetic system of Figures 16-19 generally includes a locking fastener 50, a tibial baseplate 100, at least a portion of an element attachment feature 20, a first augmentation portion 510 having a first augmentation ledge 531, a second augmentation portion 520 having a second augmentation ledge 532, a first augmentation fastener 511, and a second augmentation fastener 522.

[0164] In some embodiments, the locking fasteners 50, tibial baseplates 100, and element attachment features 20 may have the same / similar functionality as other locking fasteners, tibial baseplates, and element attachment features described herein.

[0165] In some embodiments, the prosthetic system of FIGS. 16-19 may also include other elements described herein, such as a stem 400, a stem adapter 300, etc.

[0166] In some embodiments, the bone-facing side 2 of the first augment 510 and / or the second augment 520 may include a bone-engaging surface 4 that includes a porous surface coating 5. In some embodiments, the porous surface coating 5 may be an additive surface coating (e.g., a porous titanium surface, or other porous metal surface), a nanocoating, or other treatment that may be configured to promote bone growth in cementless (or cemented) applications.

[0167] In some embodiments, the height of the first augment and / or the second augment may be selected to suit a predetermined resected tibial plateau morphology.

[0168] 16-19, the first augment 510 may be approximately 10 mm in height and the second augment 520 may be approximately 5 mm in height. However, it will be understood that augments of any size / height may be utilized with the arthroplasty systems and components of the present disclosure.

[0169] As shown in FIG. 19, in some embodiments, the first augmenting ledge 531 and / or the second augmenting ledge 532 protrude slightly from the rotating plate 25 to help lock / retain the rotating plate 25 to the tibial baseplate 100.

[0170] 20-22D show various views of an arthroplasty system or knee arthroplasty system according to another embodiment of the present disclosure. Specifically, FIG. 20 is an exploded view of the arthroplasty system, FIG. 21 is a perspective view of the arthroplasty system, FIG. 22A is a perspective view of a conical sleeve of the arthroplasty system, FIG. 22B is a side view of the conical sleeve, FIG. 22C is a top view of the conical sleeve, and FIG. 22D is a bottom view of the conical sleeve.

[0171] In some embodiments, the arthroplasty system of FIGS. 20-22D generally includes a locking fastener 50, a tibial baseplate 100, an element attachment feature 20, a stem 400, and a conical sleeve 600 or stem / conical augment.

[0172] In some embodiments, the locking fastener 50, tibial baseplate 100, element attachment feature 20, and stem 400 may include features that are the same as or similar to other locking fasteners, tibial baseplates, element attachment features, and stems described herein.

[0173] In some embodiments, the conical sleeve 600 includes a moving coupler 40 formed at the proximal end of the conical sleeve 600, a bone-engaging surface 4 that may or may not include a porous surface coating 5, a conical sleeve bore 644, and a conical sleeve thread 608.

[0174] In some embodiments, the porous surface coating 5 may be an additive surface coating (e.g., a porous titanium surface, or other porous metal surface), nanocoating, or other treatment that may be configured to promote bone growth in cementless (or cemented) applications.

[0175] The moving coupler 40 formed on the proximal end of the conical sleeve 600 can perform the same function as the moving coupler 40 formed on the proximal end of the stem adapter 300, as described above. In this manner, the conical sleeve 600 (and / or the stem 400 coupled thereto) can rotate and / or move relative to the bone-facing side 2 of the tibial baseplate 100, similar to that described above with respect to FIGS. 10-15D.

[0176] In some embodiments, the arthroplasty system of Figures 20-22D can be utilized in revision knee replacement procedures, which may require a stem 400 (or intramedullary rod) and a conical sleeve 600 for additional stability. However, it will be understood that the arthroplasty system of Figures 20-22D can also be utilized in primary knee replacement procedures.

[0177]

[0023] Figures 23-26D show various views of an arthroplasty system or knee arthroplasty system according to another embodiment of the present disclosure. Specifically, Figure 23 shows an exploded view of the arthroplasty system. Figure 24 is a perspective view of the assembled arthroplasty system, Figure 25A is a perspective view of an oval sleeve of the arthroplasty system, Figure 25B is a side view of the oval sleeve, Figure 25C is a top view of the oval sleeve, Figure 25D is a bottom view of the oval sleeve, Figure 26A is a perspective view of an exemplary broach of the arthroplasty system, Figure 26B is another perspective view of the broach, Figure 26C is a side view of the broach, and Figure 26D is a bottom view of the broach.

[0178] In some embodiments, the arthroplasty system of FIGS. 23-26D generally includes a locking fastener 50, a tibial baseplate 100, an element attachment feature 20, a stem 400, and an oblong sleeve 700.

[0179] In some embodiments, the locking fastener 50, tibial baseplate 100, element attachment feature 20, and stem 400 may have the same / similar functionality as other locking fasteners, tibial baseplates, element attachment features, and stems described herein.

[0180] In some embodiments, the oval sleeve 700 may include a moving coupler 40 formed at the proximal end of the oval sleeve 700, a bone-engaging surface 4 that may or may not include a porous surface coating 5, an oval sleeve bore 744, and an oval sleeve screw 708.

[0181] In some embodiments, the porous surface coating 5 may be an additive surface coating (e.g., a porous titanium surface, or other porous metal surface), a nanocoating, or other treatment that may be configured to promote bone growth in cementless (or cemented) applications.

[0182] The moving coupler 40 formed on the proximal end of the oblong sleeve 700 can perform the same function as the moving coupler 40 formed on the proximal end of the stem adapter 300, as described above. In this manner, the oblong sleeve 700 (and / or the stem 400 coupled thereto) can move rotatably and / or translationally relative to the bone-facing side 2 of the tibial baseplate 100, similar to that described above with respect to FIGS. 10-15D .

[0183] In some embodiments, the arthroplasty system of Figures 23-26D can be utilized in revision knee replacement procedures, which may require the stem 400 (or intramedullary rod) and the oval sleeve 700 for additional stability. However, it will be understood that the arthroplasty system of Figures 23-26D can also be utilized in primary knee replacement procedures.

[0184] 26A-26D show various views of a broach 750 that can be used in combination with the oval sleeve 700. The broach 750 can include the same general shape as the oval sleeve 700 shown in FIGS. 25A-25D. However, the broach 750 can also include one or more cutting blades 755 disposed about the body of the broach 750 and configured to cut / file a surface of the bone (e.g., tibia, femur, etc.) to prepare the bone for receiving the oval sleeve 700.

[0185] In some embodiments, the broach 750 may be somewhat smaller in size than the corresponding oval sleeve of the arthroplasty system to ensure a tight fit when the oval sleeve 700 is press-fit into the bone prepared by the broach 750.

[0186]

[0013] Figures 27-29F show various views of an arthroplasty system or knee arthroplasty system according to another embodiment of the present disclosure. Specifically, Figure 27 is an exploded view of the arthroplasty system, Figure 28 is a perspective view of the assembled arthroplasty system, Figure 29A is a lateral side view of a femoral prosthesis of the arthroplasty system, Figure 29B is a posterior view of the femoral prosthesis, Figure 29C is a medial side view of the femoral prosthesis, Figure 29D is a front view of the femoral prosthesis, Figure 29E is a top view of the femoral prosthesis, and Figure 29F is a bottom view of the femoral prosthesis.

[0187] In some embodiments, the arthroplasty system of FIGS. 27-29F generally includes a locking fastener 50, an element attachment feature 20, a stem adapter 300, a stem 400, and a femoral element or femoral prosthesis 800.

[0188] In some embodiments, the locking fastener 50, element attachment feature 20, stem adapter 300, and stem 400 may have the same / similar functionality as other locking fasteners, element attachment features, stem adapters, and stems described herein.

[0189] In some embodiments, femoral prosthesis 800 includes an articular-facing surface 1 that generally includes an articular surface 3, a femoral articular surface, a first condylar articular surface 841, a second condylar articular surface 842, and / or a patellar articular surface 843. Femoral prosthesis 800 includes a bone-facing side 2 that includes a bone-engaging surface 4 that may or may not include a porous surface coating for cementless applications, and one or more augmented connection interfaces 810.

[0190] In some embodiments, the porous surface coating may be an additive surface coating (e.g., a porous titanium surface, or other porous metal surface), a nanocoating, or other treatment that may be configured to promote bone growth in cementless (or cemented) applications.

[0191] In some embodiments, the arthroplasty system of Figures 27-29F can be utilized in revision knee arthroplasty procedures that may require a stem 400 or an intramedullary rod for additional stability. However, it will be understood that the arthroplasty system of Figures 27-29F can also be utilized in primary knee arthroplasty procedures.

[0192] In some embodiments, the femoral prosthesis 800 can also include a prosthesis attachment feature 10 or a first adjustable attachment feature, as described herein above with respect to Figures 1-5D. The prosthesis attachment feature 10 can be formed on the bone-facing side 2 of the femoral prosthesis 800, and the size of the recess diameter 14 can be adapted to fit the femoral prosthesis 800.

[0193] In some embodiments, the prosthesis attachment feature 10 may include a circular shape having a diameter of at least 10 mm.

[0194] However, in some embodiments, the prosthesis attachment feature 10 may also include a circular shape with a diameter of less than 10 mm.

[0195] In some embodiments, the prosthesis attachment feature 10 may include a circular shape having a diameter of at least 20 mm.

[0196] In some embodiments, the prosthesis attachment feature 10 may include a circular shape having a diameter of at least 30 mm.

[0197] In some embodiments, the prosthesis attachment feature 10 may include a circular shape having a diameter of at least 40 mm.

[0198] In some embodiments, the prosthesis attachment feature 10 may include a circular shape having a diameter of at least 50 mm.

[0199] The size of the element attachment feature 20 can also be adjusted to fit the recess diameter 14. Thus, as previously described, the transfer member 30 includes the protrusion 36.

[0200] 30 and 31 show exploded and assembled perspective views of an arthroplasty system or knee arthroplasty system according to another embodiment of the present disclosure.

[0201] In some embodiments, the arthroplasty system of Figures 30 and 31 may generally include a locking fastener 50, a femoral prosthesis 800, an element attachment feature 20, an oval sleeve 700, and a stem 400, as previously described herein.

[0202] In some embodiments, the arthroplasty system of Figures 30 and 31 may be utilized in revision knee arthroplasty procedures that may require the stem 400, intramedullary rod, and / or oval sleeve 700 for additional stability. However, it will be understood that the arthroplasty system of Figures 30 and 31 may also be utilized in primary knee arthroplasty procedures.

[0203] For example, in some embodiments, the arthroplasty system of FIGS. 30 and 31 may be modified to include only locking fastener 50, femoral prosthesis 800, element attachment feature 20, and oval sleeve 700 (or conical sleeve 600, or a shorter stem, or another sleeve or keel, etc.), and not include stem 400 as shown in FIGS. 30 and 31 . In these embodiments, the arthroplasty system may be referred to as a primary arthroplasty system utilized in a primary arthroplasty procedure to repair a diseased knee joint, regardless of whether the knee has previously undergone arthroplasty surgery. In either case, the femur may be sufficiently healthy to support a primary arthroplasty system that does not require stem 400 (or another long stem or femoral intramedullary rod, etc.) to provide the additional stability required for a revision arthroplasty procedure.

[0204] In some embodiments, a method of replacing a natural articular surface of a bone includes movably mating a first adjustable attachment feature of the arthroplasty prosthesis with a second adjustable attachment feature of the bone fixation element to movably fit the bone-facing side of the arthroplasty prosthesis, securing a bone-engaging surface of the bone fixation element to a resected surface of the bone, and replacing the natural articular surface of the bone with the articular surface of the arthroplasty prosthesis.

[0205] In some embodiments, movably mating the first adjustable attachment feature with the second adjustable attachment feature includes inserting a rotation plate of the first adjustable attachment feature into a rotation recess of the second adjustable attachment feature to rotatably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

[0206] In some embodiments, movably mating the first adjustable attachment feature with the second adjustable attachment feature includes inserting a rotation plate of the second adjustable attachment feature into a rotation recess of the first adjustable attachment feature to rotatably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

[0207] In some embodiments, movably mating the first adjustable attachment feature with the second adjustable attachment feature includes mating a moving coupler of the first adjustable attachment feature with a moving member of the second adjustable attachment feature to translatably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

[0208] In some embodiments, movably mating the first adjustable attachment feature with the second adjustable attachment feature includes mating a moving coupler of the second adjustable attachment feature with a moving member of the first adjustable attachment feature to translatably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

[0209] In some embodiments, movably mating the first adjustable attachment feature with the second adjustable attachment feature includes inserting a rotation plate of the second adjustable attachment feature into a rotation recess of the first adjustable attachment feature to rotatably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

[0210] In some embodiments, the method further includes engaging a bone-engaging surface of a bone fixation element with a resection surface of the bone and transmitting at least one force between the resection surface and the bone-engaging surface to movably self-position the bone fixation element relative to the bone-facing side of the arthroplasty prosthesis.

[0211] In some embodiments, the method also includes activating a locking mechanism, such as, as one non-limiting example, a locking fastener 50, to prevent further movement of the bone fixation element relative to the opposing bone side of the arthroplasty prosthesis.

[0212] In some embodiments, a method for replacing a natural articular surface of a bone of a knee joint includes mating a prosthesis attachment feature of a knee joint prosthesis with one of the primary attachment features of a primary bone fixation element and the revision attachment feature of a revision bone fixation element to removably couple the primary bone fixation element and one of the revision bone fixation elements to a bone-facing side of the knee joint prosthesis, securing one of the primary bone-engaging surfaces of the primary bone fixation element and the revision bone-engaging surface of the revision bone fixation element to a resected surface of the bone, and replacing the natural articular surface of the bone with the articular surface of the joint-facing side of the knee joint prosthesis. When the primary bone fixation element is secured to the bone, at least a majority of the primary bone fixation element is located outside the intramedullary canal of the bone. When the revision bone fixation element is secured to the bone, a distal portion of the stem of the revision bone fixation element is securable within the intramedullary canal of the bone.

[0213] In some embodiments, mating the prosthesis attachment feature with one of the primary attachment feature and the revision attachment feature includes inserting a prosthesis plate of the prosthesis attachment feature into one of the primary recess of the primary attachment feature and the revision recess of the revision attachment feature to removably couple the one of the primary bone fixation element and the revision bone fixation element to the bone-facing side of the knee arthroplasty prosthesis.

[0214] In some embodiments, mating the prosthesis attachment feature with one of the primary and revision attachment features includes mating a prosthesis recess of the prosthesis attachment feature with one of the primary plate of the primary attachment feature and the revision plate of the revision attachment feature to releasably couple the primary bone fixation element and one of the revision bone fixation elements to the bone-facing side of the knee arthroplasty prosthesis.

[0215] In some embodiments, mating the prosthesis attachment feature with one of the primary attachment feature and the revision attachment feature includes mating a prosthesis movement member of the prosthesis attachment feature with one of the primary movement coupler of the primary attachment feature and the revision movement coupler of the revision attachment feature to releasably couple one of the primary bone fixation element and the revision bone fixation element to a bone-facing side of the knee arthroplasty prosthesis.

[0216] In some embodiments, mating the prosthesis attachment feature with one of the primary attachment feature and the revision attachment feature includes mating a prosthesis movement coupler of the prosthesis attachment feature with one of the primary movement member of the primary attachment feature and the revision movement member of the revision attachment feature to releasably couple one of the primary bone fixation element and the revision bone fixation element to a bone-facing side of the knee arthroplasty prosthesis.

[0217] In some embodiments, the method further includes engaging one of the primary and revision bone-engaging surfaces with a resected surface of the bone, and transmitting at least one force between the resected surface and one of the primary and revision bone-engaging surfaces to movably self-position one of the primary and revision bone fixation elements relative to an opposing bone side of the knee arthroplasty prosthesis.

[0218] In some embodiments, the method also includes activating a locking mechanism, such as, as one non-limiting example, locking fastener 50, to prevent further movement of the bone fixation element relative to the opposing bone side of the knee arthroplasty prosthesis.

[0219] In some embodiments, the knee arthroplasty prosthesis comprises one of a tibial baseplate having a tibial articular surface on an articular-facing side of the tibial baseplate, and a femoral prosthesis having a femoral articular surface on an articular-facing side of the femoral prosthesis. The primary bone fixation element comprises at least one of a short stem, a keel, a sleeve, an adapter, and an augment.

[0220] In some embodiments, the revision bone fixation element further comprises at least one of a keel, a sleeve, an adaptor, and an augment.

[0221] In some embodiments, a method for replacing a natural articular surface of a bone of a knee joint includes the steps of selecting one of a primary bone fixation element comprising a primary bone engaging surface securable to the resected surface of the bone and a primary attachment feature, and a revision bone fixation element comprising a revision bone engaging surface securable to the resected surface of the bone and a revision attachment feature; and rotatably and / or translatably mating a prosthesis attachment feature of the knee arthroplasty prosthesis with either the primary attachment feature or the revision attachment feature to couple either the primary bone fixation element or the revision bone fixation element to the bone-facing side of the knee arthroplasty prosthesis. The method further comprises securing either the primary bone-engaging surface or the revision bone-engaging surface to the resected surface of the bone, and replacing the natural articular surface of the bone with the articular surface of the articular-facing side of the knee arthroplasty prosthesis.

[0222] In some embodiments, the step of rotatably and / or translatably mating the prosthesis attachment feature with either the primary attachment feature or the revision attachment feature includes inserting a prosthesis plate of the prosthesis attachment feature into either the primary recess of the primary attachment feature or the revision recess of the revision attachment feature to couple either the primary bone fixation element or the revision bone fixation element to the bone-facing side of the knee arthroplasty prosthesis.

[0223] In some embodiments, the step of rotatably and / or translatably mating the prosthesis attachment feature with either the primary attachment feature or the revision attachment feature includes mating the prosthesis recess of the prosthesis attachment feature with either the primary plate of the primary attachment feature or the revision plate of the revision attachment feature to couple either the primary bone fixation element or the revision bone fixation element to the bone-facing side of the knee arthroplasty prosthesis.

[0224] In some embodiments, the step of rotatably and / or translatably mating the prosthesis attachment feature with either the primary attachment feature or the revision attachment feature includes mating a prosthesis movement member of the prosthesis attachment feature with either the primary movement coupler of the primary attachment feature or the revision movement coupler of the revision attachment feature to releasably couple either the primary bone fixation element or the revision bone fixation element to the bone-facing side of the knee arthroplasty prosthesis.

[0225] In some embodiments, the step includes mating a prosthesis movement coupler of the prosthesis attachment feature with either the primary movement member of the primary attachment feature or the modified movement member of the modified attachment feature to releasably couple either the primary bone fixation element or the modified bone fixation element to the bone-facing side of the knee arthroplasty prosthesis.

[0226] In some embodiments, the method includes engaging one of the primary and revision bone-engaging surfaces with the resected surface of the bone, and transmitting at least one force between the resected surface and one of the primary and revision bone-engaging surfaces to movably self-position the one of the primary and revision bone fixation elements relative to an opposing side of the bone of the knee arthroplasty prosthesis.

[0227] In some embodiments, the method further comprises activating a locking mechanism, such as, as one non-limiting example, locking fastener 50, to prevent further movement of either the primary or revision bone fixation elements relative to the opposing bone side of the knee arthroplasty prosthesis.

[0228] In some embodiments, actuating the locking mechanism comprises rotating the locking fastener in a first direction to prevent further movement of either the primary bone fixation element or the revision bone fixation element relative to the opposing bone side of the knee arthroplasty prosthesis.

[0229] In some embodiments, releasing the locking mechanism includes rotating the locking fastener 50 in a second direction to allow movement of either the primary or revision bone fixation element relative to the bone-facing side of the knee arthroplasty prosthesis.

[0230] In some embodiments, when the primary bone fixation element is secured to the bone, at least a majority of the primary bone fixation element is located outside the intramedullary canal of the bone, and when the revision bone fixation element is secured to the bone, a distal portion of the stem of the revision bone fixation element is securable within the intramedullary canal of the bone.

[0231] In some embodiments, the revision bone fixation element further comprises at least one of a keel, a sleeve, an adaptor, and an augment.

[0232] In some embodiments, the primary bone fixation element comprises at least one of a short stem, a keel, a sleeve, an adaptor, and an augment.

[0233] In some embodiments, the knee arthroplasty prosthesis includes a tibial baseplate having a tibial articular surface on an articular-facing side of the tibial baseplate.

[0234] In some embodiments, the knee arthroplasty prosthesis comprises a femoral prosthesis comprising a femoral articular surface on an opposing side of the femoral prosthesis.

[0235] In some embodiments, a method for replacing a natural articular surface of a bone comprises removably mating a prosthesis attachment feature of an arthroplasty prosthesis with an element attachment feature of a bone fixation element to removably couple the bone fixation element to a bone-facing side of the arthroplasty prosthesis. The method may comprise securing a bone-engaging surface of the bone fixation element to a resected surface of the bone, and replacing the natural articular surface of the bone with the articular surface of the arthroplasty prosthesis. The prosthesis attachment feature comprises a circular shape having a diameter of at least 10 mm.

[0236] In some embodiments, the prosthesis attachment feature comprises a first circular shape having a first diameter of at least 10 mm, the element attachment feature comprises a second circular shape having a second diameter of at least 10 mm, and the prosthesis attachment feature and the element attachment feature comprise complementary circular shapes.

[0237] In some embodiments, the diameter of the circular shape is at least 20 mm.

[0238] In some embodiments, the diameter of the circular shape is at least 30 mm.

[0239] In some embodiments, the step of releasably coupling the prosthesis attachment feature with the element attachment feature comprises inserting a prosthesis plate of the prosthesis attachment feature into an element recess of the element attachment feature to releasably engage the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

[0240] In some embodiments, the method further comprises engaging the engagement surface with a resection surface of the bone and transmitting at least one force between the resection surface and the bone engagement surface to movably self-position the bone fixation element relative to the bone-facing side of the arthroplasty prosthesis.

[0241] In some embodiments, the method further comprises activating a locking mechanism, such as, as one non-limiting example, a locking fastener 50, to prevent further movement of the bone fixation element relative to the bone-facing side of the arthroplasty prosthesis.

[0242] In some embodiments, actuating the locking mechanism includes rotating the locking fastener 50 in a first direction to prevent further movement of the bone fixation element relative to the opposing bone side of the arthroplasty prosthesis.

[0243] In some embodiments, releasing the locking mechanism may include rotating the locking fastener 50 in a second direction to allow movement of either the primary or revision bone fixation element relative to the bone-facing side of the knee arthroplasty prosthesis.

[0244] In some embodiments, the method further comprises engaging at least one first anti-rotation feature of the arthroplasty prosthesis with at least one second anti-rotation feature of the bone fixation element to resist rotation of the bone fixation element relative to the opposing bone side of the arthroplasty prosthesis.

[0245] In some embodiments, the arthroplasty prosthesis comprises one of a tibial baseplate, the tibial baseplate comprising a tibial articular surface on an articular-facing side of the tibial baseplate, and a femoral prosthesis, the femoral prosthesis comprising a femoral articular surface on an articular-facing side of the femoral prosthesis. The bone fixation element comprises at least one of a stem, a keel, a sleeve, an adapter, and an augment.

[0246] Any procedure or method disclosed herein may include one or more steps or actions for performing the described method. Method steps and / or actions may be interchanged with one another. In other words, unless a particular order of steps or actions is required for proper operation of an embodiment, the order and / or use of certain steps and / or actions may be modified.

[0247] References throughout this specification to an "embodiment" mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in at least one embodiment. Thus, references to phrases or variations thereof throughout this specification do not necessarily all refer to the same embodiment.

[0248] Similarly, in the description of the foregoing embodiments, it should be understood that various features may be grouped together in a single embodiment, figure, or description for the purpose of streamlining the disclosure. However, this method of disclosure should not be interpreted as reflecting an intention that an embodiment requires more features than are expressly recited in that embodiment. Rather, inventive aspects lie in a combination of fewer than all features of a single foregoing disclosed embodiment.

[0249] The recitation of the term "first" with respect to a feature or element does not necessarily imply the presence of a second or additional such feature or element. Elements recited in means-plus-function form are intended to be construed in accordance with 35 U.S.C. § 112(f). Those skilled in the art will recognize that changes can be made in the details of the above-described embodiments without departing from the underlying principles described herein.

[0250] The phrases "connected," "coupled," "engaged," and "communicate" refer to any form of interaction between two or more entities, including mechanical, electrical, magnetic, electromagnetic, fluid, and thermal interaction. Two elements may be operatively coupled without being in direct contact. The phrase "coupled" may include elements that are integrally formed together, elements that are detachably and / or irremovably coupled together, elements that are operatively coupled through one or more intermediate elements, etc. The phrase "abutting" refers to items that may be in direct physical contact with each other, but are not necessarily attached together. The phrase "fluid communication" refers to two or more features that are connected such that fluid within one feature can pass to another feature. As defined herein, the phrase "substantially" means within + / - 20% of a target value, measurement, or desired property.

[0251] While particular embodiments and applications of the present disclosure have been illustrated and described, it should be understood that the scope of the disclosure is not limited to the precise configuration and components disclosed herein. Various modifications, changes, and variations may be apparent to those skilled in the art in the arrangement, operation, and details of the devices, systems, methods, and / or apparatus disclosed herein.

Claims

1. 1. An arthroplasty system for replacing a natural articular surface of a bone, said arthroplasty system comprising: an arthroplasty prosthesis including a joint-facing side including an articular surface and a bone-facing side including a first adjustable attachment feature; a bone fixation element including a bone engaging surface engageable with the resected surface of the bone and a second adjustable attachment feature; the first adjustable attachment feature is configured to movably mate with the second adjustable attachment feature to movably mate the bone fixation element to the bone opposing side of the joint arthroplasty prosthesis.

2. the first adjustable attachment feature comprises a rotating plate coupled to the bone-facing side of the arthroplasty prosthesis; 2. The joint arthroplasty system of claim 1, wherein the second adjustable attachment feature comprises a rotation recess formed in the bone fixation element and configured to accommodate the rotation plate for rotatably coupling the bone fixation element to the opposing bone side of the joint arthroplasty prosthesis.

3. the first adjustable attachment feature comprises a rotation recess formed in the bone-facing side of the arthroplasty prosthesis; 2. The joint arthroplasty system of claim 1, wherein the second adjustable attachment feature comprises a rotation plate coupled to the bone fixation element and configured to mate with the rotation recess to rotatably couple the bone fixation element to the opposing bone side of the joint arthroplasty prosthesis.

4. the first adjustable attachment feature includes a translation member coupled to the bone-facing side of the arthroplasty prosthesis; 2. The joint arthroplasty system of claim 1, wherein the second adjustable attachment feature includes a movement coupler configured to movably mate with the transfer member and allow the bone fixation element to move along the transfer member relative to the bone-facing side of the joint arthroplasty prosthesis in a first direction and to move along the transfer member relative to the bone-facing side of the joint arthroplasty prosthesis in a second direction opposite the first direction.

5. the first adjustable attachment feature includes a moving coupler on the bone-facing side of the arthroplasty prosthesis; 2. The arthroplasty system of claim 1, wherein the second adjustable attachment feature includes a movement member configured to movably mate with the movement coupler and enable the bone fixation element to move along the movement coupler in a first direction relative to the bone-facing side of the arthroplasty prosthesis and to move along the movement coupler in a second direction opposite the first direction relative to the bone-facing side of the arthroplasty prosthesis.

6. the first adjustable attachment feature includes a rotation recess formed in the bone-facing side of the arthroplasty prosthesis; the second adjustable attachment feature includes a rotation plate coupled to the bone fixation element and configured to mate with the rotation recess to rotatably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis; 2. The arthroplasty system of claim 1, wherein the rotating plate further comprises a transfer member coupled to the rotating plate, and the bone fixation element further comprises a transfer coupler movably coupled to the transfer member and configured to allow the bone fixation element to move in a first direction along the transfer member relative to the rotating plate and to move in a second direction opposite the first direction along the transfer member relative to the rotating plate.

7. the arthroplasty prosthesis includes a tibial baseplate having a tibial articular surface on an opposing articular side of the tibial baseplate; The arthroplasty system of claim 1 , wherein the bone fixation element comprises at least one of a keel, a stem, a sleeve, an adaptor, and an augment.

8. the arthroplasty prosthesis comprises a femoral prosthesis having a femoral articular surface on an opposing side of the femoral prosthesis; The arthroplasty system of claim 1 , wherein the bone fixation element comprises at least one of a keel, a stem, a sleeve, an adaptor, and an augment.

9. 1. A knee arthroplasty system for replacing natural articular surfaces of bones of a knee joint, said knee arthroplasty system comprising: an arthroplasty knee prosthesis including a joint-facing side including an articular surface and a bone-facing side including a prosthesis attachment feature; a primary bone fixation element including a bone engaging surface that can engage a resected surface of a bone and a primary attachment feature, wherein at least a majority of the primary bone fixation element is located outside of an intramedullary canal of the bone when the primary bone fixation element is secured to the bone; a revision bone fixation element including a revision attachment feature and a stem including a distal portion securable in an intramedullary canal of the bone when the revision bone fixation element is secured to the bone; Equipped with the prosthesis attachment feature is configured to mate with the primary attachment feature to removably couple the primary bone fixation element to the bone-facing side of the knee arthroplasty prosthesis; The prosthesis attachment feature is configured to mate with the revision attachment feature to removably couple the revision bone fixation element to the bone-opposing side of a knee arthroplasty prosthesis.

10. the prosthesis attachment feature includes a prosthesis plate coupled to a bone-facing side of the knee arthroplasty prosthesis; the primary attachment feature includes a primary recess formed in the primary bone fixation element and configured to removably mate with the prosthetic plate; The knee arthroplasty system of claim 9 , wherein the revision attachment feature includes a revision recess formed in the revision bone fixation element and configured to removably mate with the prosthesis plate.

11. the prosthesis attachment feature includes a prosthesis recess formed in a bone-facing side of the knee arthroplasty prosthesis; the primary attachment feature includes a primary plate coupled to the primary bone fixation element and configured to removably mate with the prosthesis recess; The knee arthroplasty system of claim 9 , wherein the revision attachment feature includes a revision plate coupled to the revision bone fixation element and configured to removably mate with the prosthesis recess.

12. the prosthesis attachment feature comprises a prosthesis movement member on a bone-facing side of the knee arthroplasty prosthesis; the primary attachment feature comprises a primary movement coupler configured to removably mate with the prosthesis movement member; The knee arthroplasty system of claim 9 , wherein the modification attachment feature comprises a modification movement coupler configured to removably mate with the prosthesis movement member.

13. the prosthesis attachment feature comprises a prosthesis movement coupler on a bone-facing side of the knee arthroplasty prosthesis; the primary attachment feature comprises a primary movement member configured to removably mate with the prosthesis movement coupler; The knee arthroplasty system of claim 9 , wherein the modification attachment feature comprises a modification movement member configured to removably mate with the prosthesis movement coupler.

14. the knee arthroplasty prosthesis includes a tibial baseplate having a tibial articular surface on an articular-facing side of the tibial baseplate; The knee arthroplasty system of claim 9 , wherein the primary bone fixation element includes at least one of a short stem, a keel, a sleeve, an adapter, and an augment.

15. The knee arthroplasty system of claim 14 , wherein the revision bone fixation element further comprises at least one of a keel, a sleeve, an adaptor, and an augment.

16. The knee arthroplasty prosthesis includes a femoral prosthesis having a femoral articular surface on an opposing side of the femoral prosthesis; The knee arthroplasty system of claim 9 , wherein the primary bone fixation element includes at least one of a short stem, a keel, a sleeve, an adapter, and an augment.

17. The knee arthroplasty system of claim 16 , wherein the revision bone fixation element further comprises at least one of a keel, a sleeve, an adaptor, and an augment.

18. 1. A knee arthroplasty system for replacing a natural articular surface on a bone of a knee joint, comprising: a knee arthroplasty prosthesis including a joint-facing side including an articular surface and a bone-facing side including prosthesis attachment features formed thereon; a primary bone fixation element including a primary bone engaging surface securable to a resected primary surface of the bone and a primary attachment feature; a modified bone fixation element including a modified bone engaging surface securable to the resected modified surface of the bone and a modified attachment feature; Equipped with the prosthesis attachment feature is configured to mate with either the primary attachment feature or the revision attachment feature to couple either the primary bone fixation element or the revision bone fixation element to the bone-opposing side of the knee arthroplasty prosthesis; The prosthesis attachment feature is configured to rotatably and / or translatably mate with at least one of the primary attachment feature and the revision attachment feature.

19. the prosthesis attachment feature includes a prosthesis plate coupled to a bone-facing side of the knee arthroplasty prosthesis; the primary attachment feature includes a primary recess formed in the primary bone fixation element and configured to rotatably mate with the prosthetic plate; The knee arthroplasty system of claim 18 , wherein the revision attachment feature includes a revision recess formed in the revision bone fixation element and configured to rotatably mate with the prosthesis plate.

20. the prosthesis attachment feature includes a prosthesis recess formed in a bone-facing side of the knee arthroplasty prosthesis; the primary attachment feature includes a primary plate coupled to the primary bone fixation element and configured to rotatably mate with the prosthesis recess; The knee arthroplasty system of claim 18 , wherein the revision attachment feature includes a revision plate coupled to the revision bone fixation element and configured to rotatably mate with the prosthesis recess.

21. the prosthesis attachment feature comprises a prosthesis movement member on a bone-facing side of the knee arthroplasty prosthesis; the primary attachment feature comprises a primary movement coupler configured to translatably mate with the prosthesis movement member; The knee arthroplasty system of claim 18 , wherein the modification attachment feature comprises a modification movement coupler configured to translatably mate with the prosthesis movement member.

22. the prosthesis attachment feature comprises a prosthesis movement coupler on a bone-facing side of the knee arthroplasty prosthesis; the primary attachment feature comprises a primary movement member configured to translatably mate with the prosthesis movement coupler; The knee arthroplasty system of claim 18 , wherein the modification attachment feature comprises a modification movement member configured to translatably mate with the prosthesis movement coupler.

23. the prosthesis attachment feature includes a prosthesis recess formed in a bone-facing side of the knee arthroplasty prosthesis; the primary attachment feature includes a primary plate coupled to the primary bone fixation element and configured to rotatably mate with the prosthesis recess to rotatably mate the primary bone fixation element to the bone-facing side of the knee arthroplasty prosthesis; the primary plate further comprises a primary moving member coupled to the primary plate; 20. The knee arthroplasty system of claim 18, wherein the primary bone fixation element further comprises a primary movement coupler configured to translatably mate with the primary movement member and to enable the primary bone fixation element to move along the primary movement member in a first direction relative to the primary plate and along the primary movement member in a second direction opposite the first direction relative to the primary plate.

24. the prosthesis attachment feature includes a prosthesis recess formed in a bone-facing side of the knee arthroplasty prosthesis; the revision attachment feature includes a revision plate coupled to the revision bone fixation element and configured to rotatably mate with the prosthesis recess and rotatably couple the revision bone fixation element to the bone-facing side of the knee arthroplasty prosthesis; The correction plate further comprises a correction movement member coupled to the correction plate; 20. The knee arthroplasty system of claim 18, wherein the correction bone fixation element further comprises a correction movement coupler configured to translatably mate with the correction movement member and to enable the correction bone fixation element to move in a first direction along the correction movement member relative to the correction plate and to move in a second direction opposite the first direction along the correction movement member relative to the correction plate.

25. 20. The knee arthroplasty system of claim 18, wherein the knee arthroplasty prosthesis comprises a tibial baseplate with a tibial articular surface on an opposing articular side of the tibial baseplate.

26. 20. The knee arthroplasty system of claim 18, wherein the knee arthroplasty prosthesis includes a femoral prosthesis having a femoral articular surface on an opposing articular side of the femoral prosthesis.

27. The knee arthroplasty system of claim 18 , wherein the primary bone fixation element includes at least one of a short stem, a keel, a sleeve, an adapter, and an augment.

28. 28. The knee arthroplasty system of claim 27, wherein at least a majority of the primary bone fixation element is located outside of the intramedullary canal of the bone when the primary bone fixation element is secured to the bone.

29. 20. The knee arthroplasty system of claim 18, wherein the revision bone fixation element includes a stem, a distal portion of the stem being securable within the intramedullary canal of the bone when the revision bone fixation element is secured to the bone.

30. The knee arthroplasty system of claim 29, wherein the revision bone fixation element further comprises at least one of a keel, a sleeve, an adaptor, and an augment.

31. 1. An arthroplasty system for replacing a natural articular surface of a bone, said arthroplasty system comprising: an arthroplasty prosthesis including a joint-facing side including an articular surface and a bone-facing side including a prosthesis attachment feature; a bone fixation element including a bone engaging surface that can engage the resected surface of the bone and an element attachment feature; Equipped with the element attachment feature is configured to removably mate with the prosthesis attachment feature to removably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis; The prosthesis attachment feature includes a circular shape having a diameter of at least 10 mm.

32. the prosthesis attachment feature includes a first circular shape having a first diameter of at least 10 mm; the element attachment feature includes a second circular shape having a second diameter of at least 10 mm; The arthroplasty system of claim 31 , wherein the prosthesis attachment feature and the element attachment feature comprise complementary circular shapes.

33. 32. The arthroplasty system of claim 31, wherein the diameter of the circular shape is at least 20 mm.

34. 32. The arthroplasty system of claim 31, wherein the diameter of the circular shape is at least 30 mm.

35. the prosthesis attachment feature includes a prosthesis plate coupled to a bone-facing side of the arthroplasty prosthesis; 32. The arthroplasty system of claim 31 , wherein the element attachment feature includes an element recess configured to removably mate with the prosthesis plate to removably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

36. the prosthesis attachment feature includes a prosthesis recess formed in a bone-facing side of the arthroplasty prosthesis; 32. The arthroplasty system of claim 31 , wherein the element attachment feature is configured to removably mate with the prosthesis recess to removably couple the bone fixation element to a bone-facing side of the arthroplasty prosthesis, and comprises an element plate coupled to the bone fixation element.

37. 32. The arthroplasty system of claim 31, wherein the arthroplasty prosthesis comprises a femoral prosthesis, the femoral prosthesis comprising a femoral articular surface on an opposing articular side of the femoral prosthesis.

38. 32. The arthroplasty system of claim 31, wherein the arthroplasty prosthesis includes a tibial baseplate having a tibial articular surface on an opposing articular side of the tibial baseplate.

39. the tibial baseplate includes at least one first anti-rotation feature formed on a bone-facing side of the tibial baseplate; 39. The arthroplasty system of claim 38, wherein the bone fixation element comprises at least one second anti-rotation feature configured to removably mate with the first anti-rotation feature and resist rotation of the bone fixation element relative to the tibial baseplate.

40. The arthroplasty system of claim 31 , wherein the bone fixation element comprises at least one of a keel, a stem, a sleeve, an adaptor, and an augment.

41. 1. A method of replacing a natural articular surface of a bone, comprising: movably mating a first adjustable attachment feature of the arthroplasty prosthesis with a second adjustable attachment feature of the bone fixation element to movably mating the bone fixation element with the bone opposing side of the arthroplasty prosthesis; securing the bone engaging surface of the bone fixation element to the resected surface of the bone; replacing the natural articular surface of the bone with the opposing articular surface of the arthroplasty prosthesis; A method comprising:

42. The step of movably mating the first adjustable attachment feature with the second adjustable attachment feature comprises:

42. The method of claim 41, comprising inserting a rotation plate of the first adjustable attachment feature into a rotation recess of the second adjustable attachment feature to rotatably couple the bone fixation element to a bone-facing side of the arthroplasty prosthesis.

43. The step of movably mating the first adjustable attachment feature with the second adjustable attachment feature comprises:

42. The method of claim 41, comprising inserting a rotation plate of the second adjustable attachment feature into a rotation recess of the first adjustable attachment feature to rotatably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

44. The step of movably mating the first adjustable attachment feature with the second adjustable attachment feature comprises:

42. The method of claim 41, comprising mating a moving coupler of the first adjustable attachment feature with a moving member of the second adjustable attachment feature to translatably couple the bone fixation element to a bone-facing side of the arthroplasty prosthesis.

45. The step of movably mating the first adjustable attachment feature with the second adjustable attachment feature comprises:

42. The method of claim 41, comprising mating a moving coupler of the second adjustable attachment feature with a moving member of the first adjustable attachment feature to translatably couple the bone fixation element to a bone-facing side of the arthroplasty prosthesis.

46. The step of movably mating the first adjustable attachment feature with the second adjustable attachment feature comprises: inserting a rotation plate of the second adjustable attachment feature into a rotation recess of the first adjustable attachment feature to rotatably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis; and mating a moving coupler of the bone fixation element with a moving member of the rotating plate to translatably couple the bone fixation element to the bone-facing side of the arthroplasty prosthesis.

47. engaging a bone engaging surface of the bone fixation element with the resected surface of the bone; transmitting at least one force between the resection surface and the bone-engaging surface to movably self-position the bone fixation element relative to an opposing bone side of the arthroplasty prosthesis; 42. The method of claim 41, further comprising:

48. 48. The method of claim 47, further comprising activating a locking mechanism to prevent further movement of the bone fixation element relative to the opposing bone side of the arthroplasty prosthesis.

49. 1. A method of replacing a natural articular surface of a bone of a knee joint, comprising: mating a prosthesis attachment feature of the knee arthroplasty prosthesis with one of the primary attachment feature of the primary bone fixation element and the revision attachment feature of the revision bone fixation element to removably couple the primary bone fixation element and one of the revision bone fixation elements to the bone-facing side of the knee arthroplasty prosthesis; securing one of the primary bone-engaging surface of the primary bone fixation element and the revision bone-engaging surface of the revision bone fixation element to the resected surface of the bone; replacing the natural articular surface of the bone with the opposing articular surface of the knee arthroplasty prosthesis; Including, when the primary bone fixation element is fixed to a bone, at least a majority of the primary bone fixation element is located outside the intramedullary canal of the bone; The method, wherein a distal portion of a stem of the revision bone fixation element is securable within an intramedullary canal of the bone when the revision bone fixation element is fixed to the bone.

50. Mating the prosthesis attachment feature with one of the primary attachment feature and the revision attachment feature comprises:

50. The method of claim 49, comprising inserting a prosthesis plate of the prosthesis attachment feature into one of the primary recess of the primary attachment feature and the revision recess of the revision attachment feature to removably couple one of the primary bone fixation element and the revision bone fixation element to an opposing bone side of a knee arthroplasty prosthesis.

51. Mating the prosthesis attachment feature with one of the primary attachment feature and the revision attachment feature comprises:

50. The method of claim 49, comprising mating a prosthesis recess of the prosthesis attachment feature with one of a primary plate of the primary attachment feature and a revision plate of the revision attachment feature to releasably couple one of the primary bone fixation element and the revision bone fixation element to a bone-facing side of the knee arthroplasty prosthesis.

52. Mating the prosthesis attachment feature with one of the primary attachment feature and the revision attachment feature comprises:

50. The method of claim 49, comprising mating a prosthesis movement member of the prosthesis attachment feature with one of the primary movement coupler of the primary attachment feature and the modified movement coupler of the modified attachment feature to releasably couple one of the primary bone fixation element and the modified bone fixation element to bone opposing sides of the knee arthroplasty prosthesis.

53. Mating the prosthesis attachment feature with one of the primary attachment feature and the revision attachment feature comprises:

50. The method of claim 49, comprising mating a prosthesis movement coupler of the prosthesis attachment feature with one of the primary movement member of the primary attachment feature and the modified movement member of the modified attachment feature to releasably couple the one of the primary bone fixation element and the modified bone fixation element to bone-opposing sides of the knee arthroplasty prosthesis.

54. engaging one of the primary bone-engaging surface and the modified bone-engaging surface with the resected surface of the bone; transmitting at least one force between the resection surface and one of the primary bone-engaging surface and the revision bone-engaging surface to movably self-position one of the primary bone fixation element and the revision bone fixation element relative to an opposing bone side of the knee arthroplasty prosthesis; 50. The method of claim 49, further comprising:

55. 55. The method of claim 54, further comprising activating a locking mechanism to prevent further movement of one of the primary and revision bone fixation elements relative to an opposing bone side of the knee arthroplasty prosthesis.

56. The knee arthroplasty prosthesis comprises: a tibial baseplate comprising a tibial articular surface on an articular side of the tibial baseplate; and a femoral prosthesis, the femoral prosthesis comprising one femoral articular surface on an opposing side of the femoral prosthesis; 50. The method of claim 49, wherein the primary bone fixation element comprises at least one of a short stem, a keel, a sleeve, an adaptor, and an augment.

57. 50. The method of claim 49, wherein the revision bone fixation element further comprises at least one of a keel, a sleeve, an adaptor, and an augment.

58. 1. A method of replacing a natural articular surface of a bone of a knee joint, comprising: selecting one of a primary bone fixation element comprising a primary bone engaging surface securable to the resected surface of the bone and a primary attachment feature, and a modified bone fixation element comprising a modified bone engaging surface securable to the resected surface of the bone and a modified attachment feature; rotatably and / or translatably mating a prosthesis attachment feature of the knee arthroplasty prosthesis with either the primary attachment feature or the revision attachment feature to couple either the primary bone fixation element or the revision bone fixation element to an opposing bone side of the knee arthroplasty prosthesis; securing one of the primary bone-engaging surface and the modified bone-engaging surface to the resected surface of the bone; replacing the natural articular surface of the bone with the opposing articular surface of a knee arthroplasty prosthesis; A method comprising:

59. The step of rotatably and / or translatably mating the prosthesis attachment feature with either the primary attachment feature or the modification attachment feature comprises:

59. The method of claim 58, comprising inserting a prosthesis plate of the prosthesis attachment feature into one of the primary recesses of the primary attachment feature and the revision recesses of the revision attachment feature to couple the one of the primary bone fixation element and the revision bone fixation element to an opposing bone side of the knee arthroplasty prosthesis.

60. The step of rotatably and / or translatably mating the prosthesis attachment feature with either the primary attachment feature or the modification attachment feature comprises:

59. The method of claim 58, comprising mating a prosthesis recess of the prosthesis attachment feature with either a primary plate of the primary attachment feature or a revision plate of the revision attachment feature to couple either the primary bone fixation element or the revision bone fixation element to an opposing bone side of the knee arthroplasty prosthesis.

61. The step of rotatably and / or translatably mating the prosthesis attachment feature with either the primary attachment feature or the modification attachment feature comprises:

59. The method of claim 58, comprising mating a prosthesis movement member of the prosthesis attachment feature with either a primary movement coupler of the primary attachment feature or a modified movement coupler of the modified attachment feature to releasably couple either the primary bone fixation element or the modified bone fixation element to an opposing bone side of the knee arthroplasty prosthesis.

62. The step of rotatably and / or translatably mating the prosthesis attachment feature with either the primary attachment feature or the modification attachment feature comprises:

59. The method of claim 58, comprising mating a prosthesis movement coupler of the prosthesis attachment feature with either a primary movement member of the primary attachment feature or a modified movement member of the modified attachment feature to releasably couple either the primary bone fixation element or the modified bone fixation element to a bone-facing side of the knee arthroplasty prosthesis.

63. engaging one of the primary bone-engaging surface and the modified bone-engaging surface with the resected surface of the bone; 59. The method of claim 58, further comprising the step of transferring at least one force between the resection surface and either the primary bone-engaging surface or the revision bone-engaging surface to movably self-position either the primary bone fixation element or the revision bone fixation element relative to an opposing bone side of the knee arthroplasty prosthesis.

64. 64. The method of claim 63, further comprising activating a locking mechanism to prevent further movement of either the primary bone fixation element or the revision bone fixation element relative to an opposing bone side of the knee arthroplasty prosthesis.

65. 65. The method of claim 64, wherein actuating the locking mechanism comprises rotating a locking fastener in a first direction to prevent further movement of either the primary bone fixation element or the revision bone fixation element relative to an opposing bone side of the knee arthroplasty prosthesis.

66. when the primary bone fixation element is fixed to a bone, at least a majority of the primary bone fixation element is located outside the intramedullary canal of the bone; 59. The method of claim 58, wherein a distal portion of the stem of the revision bone fixation element is securable within the intramedullary canal of the bone when the revision bone fixation element is fixed to the bone.

67. 67. The method of claim 66, wherein the revision bone fixation element further comprises at least one of a keel, a sleeve, an adaptor, and an augment.

68. 67. The method of claim 66, wherein the primary bone fixation element comprises at least one of a short stem, a keel, a sleeve, an adaptor, and an augment.

69. 59. The method of claim 58, wherein the knee arthroplasty prosthesis comprises a tibial baseplate, the tibial baseplate comprising a tibial articular surface on an opposing articular side of the tibial baseplate.

70. 59. The method of claim 58, wherein the knee arthroplasty prosthesis comprises a femoral prosthesis, the femoral prosthesis comprising a femoral articular surface on an opposing articular side of the femoral prosthesis.

71. 1. A method of replacing a natural articular surface of a bone, comprising: removably mating a prosthesis attachment feature of the arthroplasty prosthesis with an element attachment feature of a bone fixation element to removably couple the bone fixation element to a bone-facing side of the arthroplasty prosthesis; securing a bone engaging surface of the bone fixation element to the resected surface of the bone; replacing the natural articular surface of the bone with the opposing articular surface of the arthroplasty prosthesis; Equipped with The method, wherein the prosthesis attachment feature comprises a circular shape having a diameter of at least 10 mm.

72. the prosthesis attachment feature includes a first circular shape having a first diameter of at least 10 mm; the element attachment feature includes a second circular shape having a second diameter of at least 10 mm; 72. The method of claim 71, wherein the prosthesis attachment feature and the element attachment feature comprise complementary circular shapes.

73. 72. The method of claim 71, wherein the diameter of the circular shape is at least 20 mm.

74. 72. The method of claim 71, wherein the diameter of the circular shape is at least 30 mm.

75. Removably mating the prosthesis attachment feature with the element attachment feature includes:

72. The method of claim 71, comprising inserting a prosthesis plate of the prosthesis attachment feature into an element recess of the element attachment feature to releasably couple the bone fixation element to an opposing bone side of the arthroplasty prosthesis.

76. engaging the bone engaging surface with the resected surface of the bone; transmitting at least one force between the resection surface and the bone-engaging surface to movably self-position the bone fixation element relative to an opposing bone side of the arthroplasty prosthesis; 72. The method of claim 71 further comprising:

77. and actuating a locking mechanism to prevent further movement of the bone fixation element relative to the opposing bone side of the arthroplasty prosthesis.

77. The method of claim 76.

78. 78. The method of claim 77, wherein actuating the locking mechanism comprises rotating a locking fastener in a first direction to prevent further movement of the bone fixation element relative to the opposing bone side of the arthroplasty prosthesis.

79. 72. The method of claim 71, further comprising engaging at least one first anti-rotation feature of the arthroplasty prosthesis with at least one second anti-rotation feature of the bone fixation element to resist rotation of the bone fixation element relative to an opposing bone side of the arthroplasty prosthesis.

80. The arthroplasty prosthesis comprises: a tibial baseplate comprising a tibial articular surface on an opposing articular side of the tibial baseplate; and a femoral prosthesis, the femoral prosthesis comprising one femoral articular surface on an opposing side of the femoral prosthesis; 72. The method of claim 71, wherein the bone fixation element comprises at least one of a stem, a keel, a sleeve, an adaptor, and an augment.

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