Arthroplasty femoral implant device

Abstract

Disclosed herein is an angled wall femoral component (500) of a cam-post knee arthroplasty system for posterior cruciate ligament (PCL) replacement total knee arthroplasty (TKA) or revision TKA (rTKA) procedures, such as cruciate ligament (CS), bilateral cruciate ligament (BCS), or posterior stabilization (PS) procedures. The angled wall femoral component may include a femoral box (502) configured to receive a tibial post (110) of a corresponding tibial component (100). The anterior wall (508) of the femoral box is angled anteriorly and may include an anterior cam (561). The anterior wall is angled anteriorly to allow clearance between the anterior side of the tibial post and the anterior wall, while allowing a movable engagement between the tibial post and the anterior cam during knee flexion and extension, to which the femoral component is implanted.

Description

Technical Field

[0001] Cross - reference to Related Applications This application claims the benefit of U.S. Provisional Patent Application No. 63 / 522,359, filed on June 21, 2023, and titled "Arthroplasty Femoral Implant Devices", the entire contents of which are incorporated herein by reference in their entirety.

[0002] This disclosure relates to orthopedic implants, and more specifically, to cam - post (or cam - and - post) mechanisms used in posterior cruciate ligament (PCL) total knee arthroplasty, for example, for femoral components configured for cruciate substitution (CS), bicruciate substitution (BCS), or posterior stabilized (PS) femoral components.

Background Art

[0003] The biomechanics of the knee are very complex and are affected by multiple anatomical features. Severe diseases or injuries affecting the knee joint can be surgically treated by arthroplasty to replace the ends or parts of the femur and / or tibia with artificial knee joint devices that may include artificial femoral implants and / or tibial implants.

[0004] Knee arthroplasty can be grouped into four different classification types based on the method of cruciate ligament management. For example, posterior cruciate ligament (PCL) replacement procedures may include cruciate substitution (CS), bicruciate substitution (BCS), or posterior stabilized (PS) total knee arthroplasty (TKA) procedures (or revision TKA (rTKA)), which replace the PCL with a cam - post (or cam - and - post) mechanism that helps control anterior translation during knee flexion, and involve removal of the patient's posterior cruciate ligament (PCL) (and potentially the anterior cruciate ligament (ACL)) of the knee.

[0005] The PCL replacement tibial component includes an insert having a post extending superiorly from the tibia that engages with the femoral box of the femoral component. The femoral box may include an anterior cam and / or posterior cam that interface with and stabilize the implant against, for example, tibial sliding when the knee is flexed and / or other undesirable implant movement.

[0006] The design of the femoral box joint must balance supporting the movement of the tibial post (e.g., providing an articular plane and cam mechanism) with restricting undesirable movements such as varus and valgus during flexion. Conventional cam-post articular systems fail to achieve normal knee kinematics or movement and generally have a more limited range of motion than a normal knee due to interference between the femoral box wall and the post. For example, conventional designs typically provide a limited space between the insert post and the femoral box wall, increasing the insert post strength and contact area between the posterior femoral cam and the insert post. However, this limited space between the insert post and the femoral box wall hinders the post-and-cam mechanism's ability to mimic the natural movement of a healthy knee.

[0007] Therefore, knee arthroplasty patients can benefit from cam-post mechanism implant components that support the natural movement of the knee, including promoting the desired knee kinematics, reduce pain and instability associated with conventional artificial knee joint devices, and provide sufficient strength and stability to avoid implant failure. [Overview of the project]

[0008] This summary provides a simplified introduction to some of the concepts described further in the detailed description of the invention. This summary is not intended to identify any important or essential features of the claimed subject matter, nor is it intended to assist in determining the scope of the claimed subject matter.

[0009] This disclosure describes an angled wall femoral component for a total knee joint implant system. In either prior or subsequent embodiments, the angled wall femoral component may be used in a cam-post (or cam-and-post) knee joint implant system for posterior cruciate ligament (PCL) replacement total knee arthroplasty (TKA) or revision TKA (rTKA) procedures.

[0010] In either the preceding or subsequent embodiment, the PCL replacement implant system may include an angled-wall femoral component configured to be placed at the prepared distal end of the femur, and a tibial component configured to be placed at the prepared proximal end of the tibia.

[0011] In either the preceding or succeeding embodiment, the PCL replacement implant system may be configured for cruciate ligament compensation (CS), bicruciate cruciate ligament compensation (BCS), or posterior stable (PS) procedures. In either the preceding or succeeding embodiment, the PCL replacement implant system may be configured for rTKA procedures.

[0012] In either the preceding or succeeding embodiment, the tibial component may include a tibial post extending upward from the upper surface of the tibial component. In either the preceding or succeeding embodiment, the tibial post may be formed extending from a tibial insert coupled to the tibial component.

[0013] In either the preceding or succeeding embodiment, the angled wall femoral component may include a femoral box configured to receive a tibial post. In either the preceding or succeeding embodiment, the femoral box may open on the lower side facing the tibial component. In either the preceding or succeeding embodiment, the femoral box may be enclosed on the upper side opposite the lower side.

[0014] In either the preceding or succeeding embodiment, the femoral box may include a posterior side having a posterior cam. In either the preceding or succeeding embodiment, the femoral box may include an anterior side having an anterior cam.

[0015] In either the preceding or succeeding embodiment, the anterior wall or anterior lateral wall of the femoral box may be angled. In either the preceding or succeeding embodiment, the anterior wall may include at least one angled section. In either the preceding or succeeding embodiment, the anterior wall may be recessed and / or stepped.

[0016] In either the preceding or succeeding embodiment, the anterior wall may be angled to allow clearance between the anterior side of the tibial post and the anterior wall, while simultaneously allowing engagement between the tibial post and the anterior cam. In either the preceding or succeeding embodiment, the anterior wall may be angled forward (for example, away from the posterior side of the femoral box).

[0017] In either the preceding or succeeding embodiment, the anterior wall may be angled relative to a non-angled anterior wall extending from the anterior cam of the femoral box to its upper end (or top). For example, the anterior wall may be angled forward (e.g., away from the posterior side of the femoral box) at an angle to a line extending horizontally through the arc or radius of the anterior cam.

[0018] In either the preceding or succeeding embodiment, the angle of the front wall may be about 1 degree, about 2 degrees, about 3 degrees, about 4 degrees, about 5 degrees, about 6 degrees, about 7 degrees, about 8 degrees, about 9 degrees, about 10 degrees, about 12 degrees, about 14 degrees, about 15 degrees, about 16 degrees, about 18 degrees, about 20 degrees, or about 25 degrees, and any value or range (including endpoints) between any two of these values. In either the preceding or succeeding embodiment, the angle may be about 7 degrees. In either the preceding or succeeding embodiment, the angle may be between about 7 degrees and about 10 degrees. In either the preceding or succeeding embodiment, the angle may be between about 5 degrees and about 10 degrees. In either the preceding or succeeding embodiment, the angle may be about 10 degrees.

[0019] In either the preceding or succeeding embodiment, the angle of the anterior wall may be any angle sufficient to provide clearance between the anterior wall and the tibial post of the corresponding tibial component, while simultaneously allowing engagement between the tibial post and the anterior cam.

[0020] In either the preceding or succeeding embodiment, the tibial post may have a post height, post width, and post angle (i.e., anterior angle of the tibial post). In either the preceding or succeeding embodiment, the angle of the anterior wall may be determined at least partially based on the post height, post width, and / or post angle. The angle of the anterior wall according to either the preceding or succeeding embodiment may be based on an unangled tibial post (e.g., a 90-degree or substantially 90-degree angle between the tibial post and the base or insertion surface of the tibial component). In either the preceding or succeeding embodiment, the angle of the tibial post may result in a corresponding adjustment to the angle of the anterior wall (e.g., a post with an anterior angle of 1 degree may result in an angled wall with a further 1-degree angle to maintain contact between the tibial post and the anterior wall).

[0021] In either the preceding or succeeding embodiment, the anterior wall is recessed, stepped, or otherwise formed and / or angled to allow the tibial post to avoid contact with the anterior wall through varying degrees of stretching / flexion (clearance, or non-contact movement). In either the preceding or succeeding embodiment, the anterior wall is recessed, stepped, or otherwise formed and / or angled to allow the tibial post to perform non-contact movement through stretching from approximately -10 degrees to approximately 30 degrees. In either the preceding or succeeding embodiment, the non-contact movement may be stretching from approximately 0 degrees to approximately 10 degrees, stretching from approximately 0 degrees to approximately 15 degrees, stretching from approximately 0 degrees to approximately 20 degrees, stretching from approximately 0 degrees to approximately 25 degrees, stretching from approximately 0 degrees to approximately 30 degrees, stretching from approximately 0 degrees to approximately 35 degrees, stretching from approximately 0 degrees to approximately 40 degrees, and any value or range (including endpoints) between any two of these values.

[0022] In either the preceding or succeeding embodiment, the anterior wall is recessed, stepped, or otherwise formed and / or angled to allow non-contact movement while the tibial post engages with the anterior cam through a radius or arc of approximately 1 mm to approximately 20 mm and / or through an extension of approximately 0 to approximately 30 degrees.

[0023] In either the preceding or succeeding embodiment, the femoral component of a knee joint implant system may include a femoral box configured to receive a tibial post of a corresponding tibial component, the femoral box having a posterior lateral wall and an anterior lateral wall located opposite the posterior lateral wall, the anterior wall being formed by an angled section that is angled forward to allow clearance between the anterior side of the tibial post and the anterior lateral wall during extension and flexion of the knee implanted in the knee joint implant system.

[0024] In any of the preceding or subsequent embodiments of the femur component, the femur component further includes a front cam disposed on the front side wall and configured to engage the front side of the tibia post during knee extension, the front wall being formed of an angled section that allows clearance between the front side of the tibia post and the front side wall and engagement between the front side of the tibia post and the front cam during knee extension and flexion.

[0025] In any of the preceding or subsequent embodiments of the femur component, the front cam is disposed at the lower end of the front side wall.

[0026] In any of the preceding or subsequent embodiments of the femur component, the angled portion extends upward from the front cam of the femur box to the upper end.

[0027] In any of the preceding or subsequent embodiments of the femur component, the front side wall is recessed or stepped.

[0028] In any of the preceding or subsequent embodiments of the femur component, the angled section is angled forward at an angle sufficient to provide clearance between the tibia post and the front side wall during knee extension and flexion.

[0029] In any of the preceding or subsequent embodiments of the femur component, the angled section is angled forward at an angle sufficient to provide clearance between the tibia post and the front side wall during extension from about 0 degrees to about 30 degrees.

[0030] In any of the preceding or subsequent embodiments of the femur component, the angled section is angled forward from about 5 degrees to about 10 degrees.

[0031] In any of the preceding or subsequent embodiments of the femur component, the angled section is angled forward at about 10 degrees.

[0032] In either the preceding or succeeding embodiment of the femoral component, the angled section is angled forward by approximately 7 degrees.

[0033] In either the preceding or succeeding embodiment of the femoral component, the angled section is angled forward by an angle determined based on at least one of the dimensions or post angles of the tibial post.

[0034] In either the preceding or succeeding embodiment of the femoral component, the length of the angled section is approximately 5 mm to 20 mm.

[0035] In either the preceding or subsequent embodiment of the femoral component, the femoral component is configured as one of the following: a cruciate ligament compensatory (CS) femoral component, a bicruciate ligament compensatory (BCS) femoral component, or a posteriorly stabilized (PS) femoral component.

[0036] In either the preceding or succeeding embodiment, the knee joint implant system may include a tibial component comprising a base and a tibial post having an anterior portion, the tibial post extending upward from the base, and the femoral component configured to engage with the base of the tibial component, the femoral component comprising a femoral box configured to receive the tibial post, the femoral box having a posterior lateral wall and an anterior lateral wall positioned opposite the posterior lateral wall, the anterior lateral wall being formed by an angled section angled forward to allow clearance between the anterior portion of the tibial post and the anterior lateral wall during extension and flexion of the knee implanted in the knee joint implant system.

[0037] In either an earlier or later embodiment of the knee joint implant system, the femoral component further includes an anterior cam positioned in the anterior lateral wall and configured to engage with the anterior side of the tibial post during knee extension, wherein the anterior lateral wall is formed in an angled section, allowing for clearance between the anterior side of the tibial post and the anterior lateral wall, and engagement between the anterior side of the tibial post and the anterior cam during knee extension and flexion.

[0038] In either earlier or later embodiments of the knee joint implant system, the anterior cam is positioned at the lower end of the anterior lateral wall.

[0039] In either earlier or later embodiments of the knee joint implant system, the angled portion extends upward from the anterior cam of the femoral box to its upper end.

[0040] In either earlier or later embodiments of the knee joint implant system, the anterior lateral wall is recessed or stepped.

[0041] In either earlier or later embodiments of the knee joint implant system, the angled section is angled forward to an angle sufficient to provide clearance between the tibial post and the anterior lateral wall during knee extension and flexion.

[0042] In either earlier or later embodiments of the knee joint implant system, the angled section is angled forward to an angle sufficient to provide clearance between the tibial post and the anterior lateral wall during extensions of approximately 0 to 30 degrees.

[0043] In either earlier or later embodiments of the knee joint implant system, the angled section is angled forward by approximately 5 to 10 degrees.

[0044] In either earlier or later embodiments of the knee joint implant system, the angled section is angled forward by approximately 10 degrees.

[0045] In either earlier or later embodiments of the knee joint implant system, the angled section is angled forward by approximately 7 degrees.

[0046] In either earlier or later embodiments of the knee joint implant system, the angled section is angled forward by an angle determined based on at least one of the dimensions of the tibial post or the post angle.

[0047] In either earlier or later embodiments of the knee joint implant system, the length of the angled section is approximately 5 mm to 20 mm.

[0048] In either an earlier or later embodiment of the knee joint implant system, the knee joint implant system is configured as one of the following: a cruciate ligament compensation (CS) knee joint implant system, a bilateral cruciate ligament compensation (BCS) knee joint implant system, or a posteriorly stabilized (PS) knee joint implant system.

[0049] In either the preceding or succeeding embodiment, a method for performing knee arthroplasty on a patient comprises implanting a tibial component including a prepared proximal end of the tibia of the patient's knee joint, the tibial component comprising a base and a tibial post having an anterior side, the tibial post extending superiorly from the base, and implanting a femoral component onto a prepared distal end of the femur of the knee, the femoral component comprising a femoral box configured to engage with the base of the tibial component and to receive the tibial post, the femoral box having a posterior lateral wall and an anterior lateral wall located opposite the posterior lateral wall, the anterior lateral wall being formed by an angled section angled forward to allow clearance between the anterior side of the tibial post and the anterior lateral wall during extension and flexion of the knee implanted in the knee joint implant system.

[0050] In either a preceding or succeeding embodiment of the method, the femoral component further includes an anterior cam positioned in the anterior lateral wall and configured to engage with the anterior side of the tibial post during knee extension, wherein the anterior lateral wall is formed in an angled section, allowing for clearance between the anterior side of the tibial post and the anterior lateral wall, and engagement between the anterior side of the tibial post and the anterior cam during knee extension and flexion.

[0051] In either the preceding or succeeding embodiment of the method, the front cam is positioned at the lower end of the front side wall.

[0052] In either the preceding or succeeding embodiment of the method, the angled portion extends upward from the anterior cam of the femoral box to the upper end.

[0053] In either the earlier or later embodiment of the method, the front sidewall is recessed or stepped.

[0054] In either the preceding or succeeding embodiment of the method, the angled section is angled forward by an angle sufficient to provide clearance between the tibial post and the anterior lateral wall during knee extension and flexion.

[0055] In either the preceding or succeeding embodiment of the method, the angled section is angled forward by an angle sufficient to provide clearance between the tibial post and the anterior lateral wall during extensions of approximately 0 to 30 degrees.

[0056] In either the preceding or succeeding embodiment of the method, the angled section is angled forward by approximately 5 to 10 degrees.

[0057] In either the preceding or succeeding embodiment of the method, the angled section is angled forward by approximately 10 degrees.

[0058] In either the preceding or succeeding embodiment of the method, the angled section is angled forward by approximately 7 degrees.

[0059] In either the preceding or succeeding embodiment of the method, the angled section is angled forward by an angle determined based on at least one of the dimensions of the tibial post or the post angle.

[0060] In either the preceding or succeeding embodiment of the method, the length of the angled section is approximately 5 mm to approximately 20 mm.

[0061] In either the preceding or succeeding embodiment of the method, the knee arthroplasty includes one of the following procedures: cruciate ligament compensation (CS), bilateral cruciate ligament compensation (BCS), or posterior stabilization (PS).

[0062] The embodiments of this disclosure offer numerous technical advantages and features compared to conventional systems. In one non-limiting example, an angled wall femoral component can reduce, minimize, or even eliminate interference with the anterior wall (or anterior lateral wall) of a femoral box (in particular, including a walled upper end or an enclosed femoral box having an upper end). In an additional non-limiting example, an angled wall femoral component allows for increased posterior tibial joint movement with the anterior cam while avoiding undesirable contact between the anterior side of the tibial post and the anterior wall.

[0063] Accordingly, as described in detail in this disclosure, some embodiments may provide a geometrically shaped femoral component configured to provide improved implant stability and kinematic performance over the full range of motion of the affected knee compared to conventional implant systems.

[0064] Examples are not limited thereto. Additional technical advantages and features compared to conventional systems will be obvious to those skilled in the art based on this disclosure.

[0065] At least one embodiment of the present disclosure Further features and advantages of the part, as well as the structure and operation of various embodiments of this disclosure, will be described in detail below with reference to the accompanying drawings. [Brief explanation of the drawing]

[0066] As an example, the disclosed features, components, and systems are described herein with reference to the attached drawings below.

[0067] [Figure 1A] Figure 1A shows an exemplary example of a cam-post knee joint implant system according to the present disclosure. [Figure 1B] Figure 1B shows an exemplary example of a cam-post knee joint implant system according to this disclosure. [Figure 1C] Figure 1C shows an exemplary example of a cam-post knee joint implant system according to this disclosure. [Figure 2A] Figure 2A shows an internal sagittal view of an exemplary example of the angled wall femoral component of the cam-post knee joint implant system according to the present disclosure. [Figure 2B] Figure 2B shows an internal sagittal view of an exemplary example of the angled wall femoral component of the cam-post knee joint implant system according to the present disclosure. [Figure 2C] Figure 2C shows an internal sagittal view of an exemplary example of the angled wall femoral component of the cam-post knee joint implant system according to the present disclosure. [Figure 3A] Figure 3A shows an internal sagittal view of an exemplary example of an angled-wall femoral component of a cam-post knee joint implant system, compared to a femoral component having a non-angled anterior wall, according to the present disclosure. [Figure 3B] Figure 3B shows an internal sagittal view of an exemplary example of an angled-wall femoral component of a cam-post knee joint implant system according to this disclosure, compared to a femoral component having a non-angled anterior wall. [Figure 3C]Figure 3C shows an internal sagittal view of an exemplary example of an angled-wall femoral component of a cam-post knee joint implant system, compared to a femoral component having a non-angled anterior wall, according to the present disclosure. [Figure 4A] Figure 4A shows an internal sagittal view of an exemplary example of the motion of a cam-post knee joint implant system according to the present disclosure. [Figure 4B] Figure 4B shows an internal sagittal view of an exemplary example of the motion of a cam-post knee joint implant system according to this disclosure. [Figure 4C] Figure 4C shows an internal sagittal view of an exemplary example of the motion of a cam-post knee joint implant system according to this disclosure. [Figure 4D] Figure 4D shows an internal sagittal view of an exemplary example of the motion of a cam-post knee joint implant system according to this disclosure.

[0068] It should be understood that the drawings are not necessarily to exact scale, and that the disclosed embodiments may be illustrated graphically and in partial drawings. In certain cases, details that are not necessary for understanding the methods and devices of this disclosure, or that would make other details difficult to perceive, may be omitted. It should also be understood that this disclosure is not limited to the specific embodiments illustrated herein. Throughout the drawings, unless otherwise noted, similar reference numerals refer to similar components. [Modes for carrying out the invention]

[0069] Various features of the improved femoral component of the knee joint implant system are described in more detail below with reference to the accompanying drawings. The accompanying drawings show and describe one or more features of the femoral component. It will be understood that the various features can be used independently of each other, and that the various features can be used in combination. It will be understood that the femoral component disclosed herein may be embodied in many different forms and should not be construed as being limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure can convey specific features of the femoral component to those skilled in the art.

[0070] This disclosure describes an angled wall femoral component for a cam-post (or cam-and-post) knee joint implant system. Generally, cam-post implant systems are used in posterior cruciate ligament (PCL) replacement total knee arthroplasty (TKA) or revision TKA (rTKA) procedures where the PCL (and typically the anterior cruciate ligament (ACL)) has been removed. The cam-post knee joint implant system uses a tibial post and a femoral cam mechanism to guide anteroposterior knee movement and rollback in place of the posterior cruciate ligament (PCL).

[0071] Non-limiting examples of PCL replacement procedures include bicruciate stabilization (BCS), posterior stabilization (PS) TKA, or rTKA procedures. While BCS and PS implant systems are used in this disclosure to illustrate various features of the femoral component, the examples are not limited thereto, as the femoral component may be used with any type of knee arthroplasty and / or implant system that may operate or be configured to operate according to the described examples.

[0072] In various embodiments, the angled wall femoral component may include an anterior wall (or anterior lateral wall) of the femoral box, which includes an anterior cam and an angled anterior wall. In some embodiments, the angled anterior wall may be configured to allow clearance of the tibial post within the femoral box during knee flexion / extension to avoid contact between the post and the anterior wall, while allowing engagement between the post and the anterior cam, for example, to facilitate the natural kinematics of the knee using a knee joint implant system.

[0073] Accordingly, as described in detail in this disclosure, some embodiments may provide a geometrically shaped femoral component configured to provide improved implant stability and kinematic performance across the entire range of motion of the affected knee, including within the flexion, mid-flexion, and extension regions, compared to conventional implant systems.

[0074] As described herein, the implant device includes a femoral component which may have a configuration of various shapes, sizes, and / or other physical properties. The implant device may be provided in any preferred shape and / or configuration, which should be understood as depend on the location and type of the patient's bone to be fixed, as will be understood by those skilled in the art. For example, the implant device may include various bone-fitting segments configured to correspond to different anatomical features and / or prepared portions of the patient's anatomical structure. Furthermore, the femoral component may be part of the implant device and / or analogues of various parts of the human knee, positioned and configured to contact, fix, and fix over a spatial range including but not limited to the tibia and / or femur.

[0075] Femoral components according to some embodiments may include any additional features currently known or to be developed in the future. Femoral components may be manufactured from any suitable material currently known or to be developed in the future, including, for example, metals, polymers, plastics, ceramics, absorbable or non-absorbable composite materials, and / or similar materials. Suitable materials may include, but are not limited to, titanium, stainless steel, cobalt-chromium, polyether ether ketone (PEEK), polyethylene, ultra-high molecular weight polyethylene (UHMWPE), absorbable polylactic acid (PLA), polyglycolic acid (PGA), combinations or alloys of such materials, or any other suitable material that has sufficient strength to be fixed to and hold the bone, while also having sufficient biocompatibility to be implanted in the human body.

[0076] Figures 1A, 1B, and 1C illustrate exemplary examples of cam-post knee joint implant systems according to the present disclosure. More specifically, Figures 1A, 1B, and 1C show an orthopedic implant system 300 having a tibial component 100 having a femoral component 200. In some embodiments, the femoral component 200 and / or the tibial component 100 may be configured as primary TKA implant components. In various embodiments, the femoral component 200 and / or the tibial component 100 may be configured as revision TKA implant components (for example, to accommodate a larger post because a stem boss is required for the revision femoral component). For example, with respect to rTKA procedures and implant devices, the control and stability requirements from the prosthesis increase compared to TKA implants, as compromises in soft tissue constraints increase.

[0077] As shown in Figures 1A, 1B, and 1C, the tibial component 100 may be coupled with the insert 108. The femoral component 200 may include a medial condylar section 214, a lateral condylar section 216, and a trochlear groove 209 that joins the medial and lateral condylar sections 214 and 216 together. The medial and lateral condylar sections 214 and 216 may be spaced apart from each other to form an intercondylar depression or notch. Each condylar section 214 and 216 has a distal region 228 and 226 for engaging with the tibial component 100 or a portion of the insert 108 when the knee joint is extended and partially flexed, and a posterior portion 222 and 224 for engaging with the tibial component 100 or a portion of the insert 108 when the knee joint is flexed at an angle of substantially 90 degrees or more.

[0078] During use, the insert 108 engages with the femoral component 200 by inserting a post 110 extending upward from the insert 108 into a box 202 formed within the femoral component 200 (which may be referred to without being intended to be limited to “femoral box,” “PS box,” or “BCS box”). In some embodiments, the box 202 may be formed by four walls (“box walls”), including an inner side wall 204, an outer side wall 206, a posterior side wall 210, and an anterior side wall 208. In non-limiting embodiments, in the femoral components shown in Figures 1A and 1B, the box 202 has an opening on the upper side 250 of the box 202. In some embodiments, the box 202 may be completely enclosed, and for example, a fifth wall or upper wall (not shown) may be included on the upper side 250 of the box.

[0079] Referring to Figure 1C, in various embodiments, the anterior side wall 208 may include an anterior cam 261. In some embodiments, the posterior side wall 210 may include a posterior cam 262, or may be formed as a posterior cam 262. Once the femoral component 200 and the insert 108 are coupled, the post 110 is received within the opening between the anterior cam 261 and the posterior cam 262.

[0080] The components, such as the femoral component 200 and / or insert 108 and / or post 110 and / or box 202, may be the same as, or similar to, and / or have the same or similar dimensions as, the JOURNEY II BCS implant and / or LEGION PS implant and / or its components, provided by Smith & Nephew of London, UK.

[0081] In some embodiments, box 202 may have a width of approximately 10 mm to approximately 25 mm. In various embodiments, box 202 may have a width of approximately 16.5 mm. In some embodiments, box 202 may have a width of approximately 23 mm. In various embodiments, box 202 may have a height of approximately 10 mm to approximately 40 mm. In some embodiments, box 202 may have a height of approximately 16 mm to approximately 22.8 mm.

[0082] In various embodiments, the post 110 may have a height of approximately 10 mm to approximately 25 mm. In some embodiments, the post 110 may have a height of approximately 15 mm to approximately 20 mm. In various embodiments, the post may have a width of approximately 2 mm to approximately 10 mm. In some embodiments, the post may have a width of approximately 3 mm to approximately 6 mm. In various embodiments, the post 110 may be wider at the lower portion than at the upper portion.

[0083] Figures 1B and 1C show the system 300 during full knee extension. As shown in Figure 1B, the depression 124 is located on the medial anterolateral portion of the post 110 and is positioned along the medial portion 204a of the medial wall 204. The medial wall 204 includes the lateral surface 204b and the lower boundary 205. During flexion and extension, the femoral component 200 articulates with respect to the insert 108 as its surfaces 220a and 220b articulate with respect to the medial portion 102a and lateral portion 102b of the base, respectively.

[0084] During knee extension, the front of the post 110 may engage with, for example, the anterior cam 261 to provide anterior stabilization. In some embodiments, clearance is provided such that the anterior cam 261 does not come into contact with the post 110 during normal standing, for example, when the leg is straight with approximately 0 degrees of flexion.

[0085] As the knee flexes and the femoral component 200 and insert 108 articulate relative to each other, they rotate axially relative to each other around the longitudinal axis 106 of the post 110. Specifically, the femoral component 200 rotates along arrow A1, and the insert 108 articulates axially along arrow A2. As the articulation and relative rotation occur, the femoral component 200 and insert 108 separate along their anterior sides, and the anterior portion of the femoral component 200 rises along the direction of arrow A3. As this occurs, the interface 124 rotates axially along the path of arrow A2, and the lower boundary 205 of the box 202 rises vertically along arrow A3. During this process, the depression 124 allows the anterior portion of the post 110 to clear the corner of the medial wall 204.

[0086] The operation of a cam-post implant system with an anterior cam is difficult because the post may come into contact with the front surface of the box (e.g., the inner surface of the anterior wall (or anterior lateral wall) 208). Undesirable contact between the post and the anterior wall can result from various characteristics of the post, such as the height, width, and / or placement of the post on the tibial insert. This can be particularly challenging in rTKA procedures due to the configuration of the revised tibial component and the corresponding post.

[0087] Modifying the femoral box and / or anterior wall, such as by removing material from the anterior wall or moving the anterior wall forward, can result in undesirable effects, such as cam-post joint movement with insufficient kinematics and / or shifting the point of interference without adequately eliminating anterior wall-post interference.

[0088] Therefore, in some embodiments, the angled wall femoral component may include an angled anterior wall having an anterior cam. The angled anterior wall may provide clearance for the post to engage with the anterior cam while avoiding undesirable contact with the anterior wall. In various embodiments, the angled wall femoral component may provide clearance for the tibial post throughout the full range of motion to provide improved kinematics of the postoperative knee, including natural or substantially natural kinematics, compared to conventional systems.

[0089] Figures 2A, 2B, and 2C show internal sagittal views of exemplary examples of the angled wall femoral component of the cam-post knee joint implant system according to the present disclosure. As shown in Figure 2A, the angled wall femoral component 500 may include anterior 570 and posterior 571. A box, or femoral box 502, may be located within the femoral component. The box 502 may include one or more cams, such as a posterior cam 262 and / or anterior cam 561. In various embodiments, the anterior cam 561 may be located at the lower end of the anterior wall 508, extending upward toward the upper wall 516.

[0090] Referring to Figures 2B and 2C, the front wall 508 and the front cam 561 may have various properties, such as geometric or other structural characteristics, individually or relative to each other, as shown in detail area 520.

[0091] In various embodiments, the front cam 561 may have a radius 510. In some embodiments, the radius 510 may define the size of the front cam and / or the engagement distance between the front cam 561 and the post 110. In various embodiments, the radius 510 may be about 1 mm, about 2 mm, about 3 mm, about 4 mm, about 5 mm, about 6 mm, about 7 mm, about 10 mm, about 15 mm, about 20 mm, and any value or range (including endpoints) between any two of these values.

[0092] In some embodiments, the front wall 508 (or an angled section of the front wall 508) may have a length 514, for example, extending from the front cam 561 (for example, from a centerline 513 extending from the center of the radius 510) to the upper wall 516 (or the other upper end of the box 502). In various embodiments, the front wall 508 (or an angled section of the front wall 508) may have a length of about 5 mm, about 6 mm, about 7 mm, about 8 mm, about 10 mm, about 12 mm, about 15 mm, about 16 mm, about 18 mm, about 20 mm, about 22 mm, about 25 mm, and any value or range (including endpoints) between any two of these values.

[0093] In various embodiments, the anterior wall 508 may be an angled wall. In some embodiments, the anterior wall 508 may be angled to allow clearance between the anterior side of the tibial post (e.g., post 110) and the anterior wall 508, while also allowing engagement between the tibial post and the anterior cam 561. In various embodiments, the anterior wall 508 may be angled forward (e.g., away from the rear side of box 502).

[0094] For example, referring to Figure 2C, line 511 extending along at least a portion of the front wall 508 may be angled by angle B with respect to line 512 (i.e., line 512 is perpendicular to line 513) which forms a right 90-degree angle A with respect to line 513, and may extend horizontally, for example, through the front cam 561. In various embodiments, the angle of the front wall 508, or angular characteristic (e.g., the value of angle B), may indicate an offset from a wall without an angle (e.g., line 512) (see, for example, Figures 3A, 3B, and 3C). In some embodiments, at least a portion of the front wall 508 may be shaped in a recessed, stepped, or otherwise manner to avoid contact between the front wall and the post 110. In some embodiments, a portion of the front wall 508 (e.g., the portion of the front wall 508 where the front cam 561 is located) may be non-angled and may be an angled portion.

[0095] In various embodiments, angle B (angle of the anterior wall 508) can be approximately 1 degree, approximately 2 degrees, approximately 3 degrees, approximately 4 degrees, approximately 5 degrees, approximately 6 degrees, approximately 7 degrees, approximately 8 degrees, approximately 9 degrees, approximately 10 degrees, approximately 12 degrees, approximately 14 degrees, approximately 15 degrees, approximately 16 degrees, approximately 18 degrees, approximately 20 degrees, approximately 25 degrees, and any value or range (including endpoints) between any two of these values. In some embodiments, the angle can be approximately 7 degrees. In various embodiments, angle B can be approximately 5 degrees to approximately 10 degrees. In some embodiments, angle B can be approximately 10 degrees. In various embodiments, angle B can be any angle sufficient to provide clearance between the anterior wall 508 and the tibial post of the corresponding tibial component during knee flexion / extension. In some embodiments, angle B can be any angle sufficient to provide clearance between the anterior wall 508 and the tibial post of the corresponding tibial component, while allowing engagement between the tibial post and the anterior cam 561 during knee flexion / extension.

[0096] In some embodiments, the tibial post engaging with the femoral component 500 may have a post height (e.g., about 20 mm to about 45 mm), a post width (e.g., about 10 mm to about 20 mm), and a post angle (i.e., anterior angle of the tibial post). In various embodiments, angle B may be determined at least partially based on the post height, post width, and / or post angle. Angle B may be based on a tibial post without an angle (e.g., a 90-degree or substantially 90-degree angle between the tibial post and the base or insertion surface of the tibial component). In some embodiments, the angle of the tibial post may result in a corresponding adjustment to angle B to maintain clearance between the tibial post and the anterior wall 508, for example, during knee flexion / extension.

[0097] In some embodiments, angle B and / or other anterior wall angles described herein may be based on the configuration of a corresponding tibial post having standard dimensions, e.g., a post height of approximately 34 mm to approximately 40 mm, a post width of approximately 16 mm, and a post angle of approximately 0 degrees. However, angle B and / or other anterior wall angles described herein may be based on a tibial post having different dimensions and / or post angles.

[0098] In various embodiments, the anterior wall 508 may be recessed, stepped, or otherwise shaped and / or angled to allow the tibial post to avoid contact with the anterior wall 508 through varying degrees of stretching / flexion ("clearance," or "non-contact movement"). In some embodiments, the anterior wall 508 may be recessed, stepped, or otherwise shaped and / or angled to allow non-contact movement of the tibial post through stretching portions of about 0 to about 30 degrees. In various embodiments, the non-contact movement may be stretching from about 0 to about 10 degrees, stretching from about 0 to about 15 degrees, stretching from about 0 to about 20 degrees, stretching from about 0 to about 25 degrees, stretching from about 0 to about 30 degrees, stretching from about 0 to about 35 degrees, stretching from about 0 to about 40 degrees, and any value or range (including endpoints) between any two of these values.

[0099] In some embodiments, the anterior wall 508 may be recessed, stepped, or otherwise shaped and / or angled to allow non-contact operation while the tibial post engages with the anterior cam 561 through a radius or arc of about 1 mm to about 20 mm and / or through an extension of about 0 degrees to about 30 degrees.

[0100] Figures 3A, 3B, and 3C show internal sagittal views of exemplary examples of angled-wall femoral components of a cam-post knee joint implant system according to this disclosure, compared to a femoral component having a non-angled anterior wall.

[0101] Referring to Figure 3A, it is shown that the angled wall femoral component 500 overlaps a non-angled wall femoral component 503, which has an anterior cam 552 and an anterior wall 551. The femoral component 503 may be the femoral component of the LEGION PS femoral component, or may be substantially similar. Referring to Figure 3B, angle D shows the difference between line 511 related to the anterior wall 508 and line 517 related to the anterior wall 551 of the non-angled wall femoral component 503.

[0102] Referring to Figure 3C, a non-angled wall femoral component 507 is shown. Femoral component 507 may be the femoral component of the JOURNEY II BCS femoral component, or may be substantially similar. Angle E indicates the difference between line 511 related to the anterior wall 508 and line 518 related to the anterior wall of the non-angled wall femoral component 507.

[0103] In various embodiments, angles D and / or E can be about 1 degree, about 2 degrees, about 3 degrees, about 4 degrees, about 5 degrees, about 6 degrees, about 7 degrees, about 8 degrees, about 9 degrees, about 10 degrees, about 12 degrees, about 14 degrees, about 15 degrees, about 16 degrees, about 18 degrees, about 20 degrees, about 25 degrees, and any value or range (including endpoints) between any two of these values.

[0104] In various embodiments, angles D and / or E may be any angles sufficient to provide clearance between the anterior wall 508 and the tibial post of the corresponding tibial component, while allowing engagement between the tibial post and the anterior cam 561.

[0105] Figures 4A, 4B, 4C, and 4D show internal sagittal views of exemplary examples of the motion of a cam-post knee joint implant system according to this disclosure. Generally, Figures 4A, 4B, 4C, and 4D show a cam-post knee joint implant system having an angled wall femoral component, from a first degree of flexion (Figure 4A) to full or substantially full extension (Figure 4D). In some embodiments, Figure 4A may show about 10 degrees of flexion / extension. Figure 4B may show about 5 degrees of flexion / extension. Figure 4C may show about 0 degrees of flexion / extension (e.g., parallel or substantially parallel femoral and tibial stems). Figure 4D may show about -3 degrees of flexion / extension.

[0106] Referring to Figure 4A, the angled wall femoral component 500 is shown in flexion, for example, in approximately 10 degrees of flexion / extension. The angle of the anterior wall 508 of the angled wall femoral component 500 allows for post clearance 601 (e.g., proximal post clearance) of the post 110 while supporting the cam contact 602 (anterior cam contact) (see 603 in Figures 4B, 4C, and 4D) between the post 110 and the anterior cam 561. For example, in Figures 4A and 4B, the post 110 does not contact the anterior wall 508 throughout its entire range of motion. In a conventional non-angled wall femoral box, the post 110 may have been in contact with the anterior wall during the range of motion as shown in one or more of Figures 4A, 4B, 4C, and 4D (e.g., including at least Figures 4A, 4B, and 4C).

[0107] Therefore, as shown in Figures 4A, 4B, 4C, and 4D, the increase in the cam contact area 603 facilitates joint movement of the femoral component 500, particularly with respect to the original or substantially original kinematics compared to conventional wall femoral components without angles.

[0108] The above description has broad applications. While this disclosure refers to specific examples, numerous modifications, changes, and variations are possible to the described examples without departing from the subject matter and scope of this disclosure, as set forth in the appended claims(s). Therefore, it is intended that this disclosure is not limited to the examples described. Rather, these examples should be considered illustrative and not limiting. All variations and modifications that fall within the spirit of the examples should be considered within the scope of this disclosure. This disclosure is given in its entirety, and its equivalents, as set forth by the language of the following claims. The consideration of all examples is for illustrative purposes only and does not imply that the scope of this disclosure, including the claims, is limited to these examples. In other words, while exemplary embodiments of this disclosure are described herein in detail, it will be understood that concepts, features, and / or analogous elements of the present invention may be embodied and used in various other ways, and that the appended claims are intended to be interpreted to include such modifications, unless limited by the prior art. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure belongs.

[0109] In this specification, terms relating to orientation may be used, such as top, bottom, top, bottom, inside, lateral, front, back, proximal, distal, upper side, lower side, upward, downward, left, right, longitudinal, front, back, upward, downward, vertical, horizontal, radial, axial, clockwise, counterclockwise, and similar. Such references to orientation are used solely for identification purposes to aid the reader's understanding of this disclosure. For example, the term “distal” may refer to the end furthest from the healthcare worker / operator when the device is introduced into the patient, while the term “proximal” may refer to the end closest to the healthcare worker when the device is introduced into the patient. Such references to orientation do not necessarily impose limitations, particularly with respect to the position, orientation, or use of this disclosure. Thus, references to orientation should not be limited to the orientation, distance, or size of a particular coordinate, but are used to describe relative position by referring to a particular example. Such terms do not generally limit the scope of the claims herein. Any example or feature relating to any section, part, or any other component, as illustrated or specifically described in relation to various examples relating to similar sections, parts, or components in this Specification, may be applied interchangeably to any other similar example or feature shown or described herein.

[0110] As described herein, “Examples” (such as those shown in the accompanying drawings) may refer to exemplary representations of environments, articles, or components in which the disclosed concepts or features may be provided or embodied, or to representations in which only the concepts or features may be provided or embodied. However, such exemplary examples should be understood as examples (unless otherwise stated), and other forms of embodying the described concepts or features, as can be understood by those skilled in the art when learning the concepts or features from this disclosure, are within the scope of this disclosure. Furthermore, when referring to “one embodiment” of this disclosure, it is not intended to be construed as excluding the existence of additional embodiments that also incorporate the listed features.

[0111] In addition, while drawings may show one or more examples of such concepts or features together in a single embodiment of an environment, article, or component into which such concepts or features are incorporated, it should be understood that such concepts or features are to be understood as independent and separate from one another (unless otherwise specified), and are shown together for convenience without any intention to limit them to existing together or being used together. For example, examples or features shown or described as part of one embodiment may be used separately or, in combination with another embodiment, to obtain yet another example. Thus, it is intended that the subject matter of the present invention be covered by modifications and variations such that they fall within the scope of the appended claims and their equivalents.

[0112] Where used herein, an element or step described in the singular and beginning with the word "a" or "an" should be understood not to exclude multiple elements or steps unless explicitly stated otherwise. Furthermore, where used herein, the terms “equip” and / or “equip” or “contain” and / or “contain” specify the presence of the described feature, area, step, element, and / or component, but do not exclude the presence or addition of one or more other features, areas, integers, steps, operations, elements, components, and / or groups thereof.

[0113] As used herein, the phrases “at least one,” “one or more,” and “and / or” are open-ended expressions that are both conjunctive and disjunctive with respect to their action. The terms “one (a)” (or “one (an)”), “one or more,” and “at least one” may be used interchangeably herein.

[0114] References to connections (e.g., engaged, attached, joined, connected, and joined) should be interpreted broadly and may include intermediate members between sets of elements, and intermediate members related to movement between elements, unless otherwise indicated. Therefore, references to connections do not necessarily presuppose that two elements are directly connected and fixed relative to each other. Identifying reference terms (e.g., primary, secondary, first, second, third, fourth, etc.) are not intended to indicate importance or priority, but are used to distinguish one feature from another. Drawings are for illustrative purposes only, and dimensions, locations, order, and relative sizes reflected in the accompanying drawings may differ.

[0115] The above considerations are presented for illustrative and explanatory purposes only and are not intended to limit the disclosure to the forms disclosed herein. For example, various features of the disclosure are grouped into one or more embodiments or configurations for the purpose of streamlining the disclosure. However, it will be understood that various features in specific examples or configurations of the disclosure may be combined in alternative examples or configurations. Furthermore, the following claims are incorporated into this detailed description by this reference, and each claim exists independently as a separate example of the disclosure.

Claims

1. A femoral component of a knee joint implant system, A femoral box configured to receive a tibial post of a corresponding tibial component, comprising a femoral box having a posterior lateral wall and an anterior lateral wall located opposite the posterior lateral wall, The femoral component of a knee joint implant system, wherein the anterior lateral wall is formed by an angled section that is angled forward to allow clearance between the anterior side of the tibial post and the anterior lateral wall during extension and flexion of the knee, to which the knee joint implant system is implanted.

2. The knee further comprises an anterior cam positioned on the anterior side wall and configured to engage with the anterior side of the tibial post during extension of the knee, The anterior side wall, during extension and flexion of the knee, The clearance between the anterior side of the tibial post and the anterior side wall, A femoral component of a knee joint implant system according to claim 1, formed by the angled section, which enables engagement between the anterior side of the tibial post and the anterior cam.

3. The femoral component of the knee joint implant system according to claim 2, wherein the anterior cam is positioned at the lower end of the anterior side wall.

4. The femoral component of the knee joint implant system according to claim 2, wherein the angled portion extends upward from the anterior cam to the upper end of the femoral box.

5. The femoral component of the knee joint implant system according to claim 1, wherein the anterior lateral wall is recessed or stepped.

6. The femoral component of the knee joint implant system according to claim 1, wherein the angled section is angled forward at an angle sufficient to provide clearance between the tibial post and the anterior lateral wall during extension and flexion of the knee.

7. The femoral component of the knee joint implant system according to claim 1, wherein the angled section is angled forward at an angle sufficient to provide clearance between the tibial post and the anterior lateral wall during extension from about 0 to about 30 degrees.

8. The femoral component of the knee joint implant system according to claim 1, wherein the angled section is angled forward by approximately 5 to 10 degrees.

9. The femoral component of the knee joint implant system according to claim 1, wherein the angled section is angled forward by about 10 degrees.

10. The femoral component of the knee joint implant system according to claim 1, wherein the angled section is angled forward by approximately 7 degrees.

11. The femoral component of the knee joint implant system according to claim 1, wherein the angled section is angled forward by an angle determined based on at least one of the dimensions of the tibial post or the post angle.

12. The femoral component of the knee joint implant system according to claim 1, wherein the length of the angled section is approximately 5 mm to approximately 20 mm.

13. The femoral component of the knee joint implant system according to claim 1, wherein the femoral component is configured as one of a cruciate ligament compensatory (CS) femoral component, a bilateral cruciate ligament compensatory (BCS) femoral component, or a posteriorly stabilized (PS) femoral component.

14. A knee joint implant system, A tibial component comprising a base and a tibial post having an anterior portion, wherein the tibial post extends upward from the base, A femoral component configured to engage with the base of the tibial component, wherein the femoral component is A femoral component comprising a femoral box configured to receive the tibial post, the femoral box having a posterior side wall and an anterior side wall located opposite to the posterior side wall, A knee joint implant system in which the anterior lateral wall is formed by an angled section that is angled forward to allow clearance between the anterior side of the tibial post and the anterior lateral wall during extension and flexion of the knee to which the knee joint implant system is implanted.

15. The aforementioned femoral component, The knee further comprises an anterior cam positioned on the anterior side wall and configured to engage with the anterior side of the tibial post during extension of the knee, The anterior side wall, during extension and flexion of the knee, The clearance between the anterior side of the tibial post and the anterior side wall, The knee joint implant system according to claim 14, which is formed by an angled section that enables engagement between the anterior side of the tibial post and the anterior cam.

16. The knee joint implant system according to claim 15, wherein the front cam is positioned at the lower end of the front side wall.

17. The knee joint implant system according to claim 15, wherein the angled portion extends upward from the anterior cam to the upper end of the femoral box.

18. The knee joint implant system according to claim 14, wherein the anterior side wall is recessed or stepped.

19. The knee joint implant system according to claim 14, wherein the angled section is angled forward at an angle sufficient to provide clearance between the tibial post and the anterior lateral wall during extension and flexion of the knee.

20. The knee joint implant system according to claim 14, wherein the angled section is angled forward at an angle sufficient to provide clearance between the tibial post and the anterior lateral wall during extension from about 0 to about 30 degrees.

21. The knee joint implant system according to claim 14, wherein the angled section is angled forward by approximately 5 to 10 degrees.

22. The knee joint implant system according to claim 14, wherein the angled section is angled forward by approximately 10 degrees.

23. The knee joint implant system according to claim 14, wherein the angled section is angled forward by approximately 7 degrees.

24. The knee joint implant system according to claim 14, wherein the angled section is angled forward by an angle determined based on at least one of the dimensions of the tibial post or the post angle.

25. The knee joint implant system according to claim 14, wherein the length of the angled section is approximately 5 mm to approximately 20 mm.

26. The knee joint implant system according to claim 14, wherein the knee joint implant system is configured as one of the following: a cruciate ligament compensation (CS) knee joint implant system, a bilateral cruciate ligament compensation (BCS) knee joint implant system, or a posterior stabilization (PS) knee joint implant system.

27. A method for performing knee arthroplasty on a patient, The implantation of a tibial component onto the prepared proximal end of the tibia of the knee joint of the patient, wherein the tibial component comprises a base and a tibial post having an anterior portion, and the tibial post extends upward from the base. The femoral component is implanted onto the prepared distal end of the femur of the knee, wherein the femoral component is configured to engage with the base of the tibial component, and the femoral component is A femoral box configured to receive the tibial post, comprising a posterior side wall and an anterior side wall located opposite the posterior side wall, A method comprising implanting a femoral component, which is formed in an angled section that is angled forward, so as to allow clearance between the anterior side of the tibial post and the anterior side wall during extension and flexion of the knee to which the knee joint implant system is implanted.

28. The aforementioned femoral component, The knee further comprises an anterior cam positioned on the anterior side wall and configured to engage with the anterior side of the tibial post during extension of the knee, The anterior side wall, during extension and flexion of the knee, The clearance between the anterior side of the tibial post and the anterior side wall, The method according to claim 27, wherein an angled section is formed to enable engagement between the anterior side of the tibial post and the anterior cam.

29. The method according to claim 28, wherein the front cam is positioned at the lower end of the front side wall.

30. The method according to claim 28, wherein the angled portion extends upward from the anterior cam of the femoral box to the upper end.

31. The method according to claim 27, wherein the front side wall is recessed or stepped.

32. The method according to claim 27, wherein the angled section is angled forward at an angle sufficient to provide clearance between the tibial post and the anterior lateral wall during extension and flexion of the knee.

33. The method according to claim 27, wherein the angled section is angled forward at an angle sufficient to provide clearance between the tibial post and the anterior lateral wall during extension from about 0 to about 30 degrees.

34. The method according to claim 27, wherein the angled section is angled forward by about 5 to about 10 degrees.

35. The method according to claim 27, wherein the angled section is angled forward by about 10 degrees.

36. The method according to claim 27, wherein the angled section is angled forward by about 7 degrees.

37. The method according to claim 27, wherein the angled section is angled forward by an angle determined based on at least one of the dimensions of the tibial post or the post angle.

38. The method according to claim 27, wherein the length of the angled section is approximately 5 mm to approximately 20 mm.

39. The method according to claim 27, wherein the knee arthroplasty includes one of the following procedures: cruciate ligament compensation (CS), bilateral cruciate ligament compensation (BCS), or posterior stabilization (PS).

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