Systems, implants and methods for joint arthroplasty - Patents.com

Abstract

The implant system has a tibial component, a talar component, and a calcaneal component. The implant system includes a first intermediate component disposed between the talar component and the tibial component, and a second intermediate component disposed between the talar component and the calcaneal component. The talar component has a first articular surface configured to engage with the first intermediate component and a second articular surface configured to engage with the second intermediate component. The first articular surface is disposed on a superior surface of the talar component, and the second articular surface is disposed on an inner surface of the talar component. Also disclosed is a subtalar arthroplasty system having an intermediate component and a calcaneal component. The intermediate component has an upper surface configured to articulate with the talar component. The calcaneal component has an inferior surface configured to promote attachment with the calcaneus.

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This application claims the benefit of priority to U.S. Provisional Patent Application No. 63 / 300,444, filed January 18, 2022, and entitled “System, Implant, And Methods For Arthroplasty,” the disclosure of which is incorporated by reference in its entirety herein.

[0002] The present disclosure relates to arthroplasty systems including one or more implants, instrumentation, and other devices, and arthroplasty methodologies. The present disclosure relates to podiatric and orthopedic arthroplasty systems used in arthroplasty of the foot and / or ankle. More specifically, but not exclusively, the present disclosure relates to ankle and / or subtalar joint arthroplasty systems. [Background technology]

[0003] Many of the currently available arthroplasty systems do not take into account the various anatomical and physiological concerns of physicians and patients. In some cases, the arthroplasty system fails to take into account the anatomical structures (e.g., musculoskeletal structures and kinematic properties) adjacent to the diseased joint and may adversely affect the adjacent anatomical structures after implantation. Therefore, it is desirable to have an arthroplasty system that takes into account not only the diseased joint being replaced by the arthroplasty system, but also the adjacent joints (and their structures / properties). Summary of the Invention

[0004] The present disclosure is directed to surgical guides for use in combination with implants, instrumentation, and methods related to joint arthroplasty.

[0005] A first aspect of the present disclosure includes an implant system including a tibial implant component, a talar implant component, and a calcaneal implant component.

[0006] According to a first aspect of the present disclosure, an implant system includes a first intermediate component disposed between the talar implant component and the tibial implant component and a second intermediate component disposed between the talar implant component and the calcaneal implant component.

[0007] According to a first aspect of the present disclosure, an implant system includes a first articular surface configured to engage a first intermediate component and a second articular surface configured to engage a second intermediate component.

[0008] According to a first aspect of the present disclosure, a first articular surface is disposed on a superior surface of the talar implant component and a second articular surface is disposed on an inferior surface of the talar implant component.

[0009] According to a first aspect of the present disclosure, a tibial implant component includes a first engagement surface on a top surface thereof configured to engage at least a portion of a patient's tibia.

[0010] According to a first aspect of the present disclosure, the tibial implant component includes a second engagement surface on an inferior surface thereof configured to engage with a superior surface of the first intermediate component.

[0011] According to a first aspect of the present disclosure, a first articular surface of the talar implant component is configured to engage an inferior surface of the first intermediate component.

[0012] According to a first aspect of the present disclosure, the calcaneal implant component includes a first engagement surface on an upper surface thereof configured to engage an underside of a second intermediate implant.

[0013] According to a first aspect of the present disclosure, the calcaneal implant component includes a second engagement surface at an inferior portion thereof configured to engage at least a portion of the patient's calcaneus.

[0014] According to a first aspect of the present disclosure, the second articular surface of the talar implant component is configured to engage the superior surface of the second medial component.

[0015] A first aspect of the present disclosure includes a subtalar arthroplasty system. The subtalar arthroplasty system includes an intermediate component and a calcaneal implant component.

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the detailed description, serve to explain the principles of the present invention. It is emphasized that, in accordance with standard industry practice, various features may or may not be drawn to scale. In fact, dimensions of various features may be arbitrarily increased or decreased for clarity of discussion. The drawings are intended only to illustrate embodiments of the present disclosure and are not to be construed as limiting the invention. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 illustrates a rear view of an exemplary talar implant system according to the present disclosure. [Diagram 2] FIG. 2 is a front view of the exemplary implant system of FIG. 1 for facilitating implantation of the implant system according to the present disclosure; [Diagram 3] FIG. 2 is a first side view of the exemplary implant system of FIG. 1 according to the present disclosure; [Figure 4] FIG. 2 is a second side view of the exemplary implant system of FIG. 1 according to the present disclosure; [Diagram 5] FIG. 2 is a front perspective view of the exemplary implant system of FIG. 1 according to the present disclosure; [Figure 6] FIG. 2 is a rear perspective view of the exemplary implant system of FIG. 1 in accordance with the present disclosure; [Figure 7] FIG. 2 is a top view of the tibial component of the exemplary implant system of FIG. 1 according to the present disclosure; [Figure 8] FIG. 2 is a bottom view of the calcaneal component of the exemplary implant system of FIG. 1 according to the present disclosure; [Figure 9] FIG. 2 is a top view of a portion of the exemplary implant system of FIG. 1 in accordance with the present disclosure; [Figure 10] FIG. 10 is a front view of a portion of the exemplary implant system of FIG. 9 in accordance with the present disclosure; [Figure 11] FIG. 10 is a side view of a portion of the exemplary implant system of FIG. 9 according to the present disclosure. [Figure 12] FIG. 10 is a bottom view of a portion of the exemplary implant system of FIG. 9 in accordance with the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] In this detailed description and in the claims that follow, the terms proximal, distal, anterior or planar, posterior or dorsal, medial, lateral, superior, and inferior are defined according to standard usage to designate particular portions or regions of a bone or implant, according to reference terms that indicate the relative placement or orientation of natural bone. For example, "proximal" refers to the portion of the device or implant closest to the torso, and "distal" refers to the portion of the device or implant furthest from the torso. As terms relating to direction, "anterior" means toward the front of the body, "posterior" means toward the back of the body, "medial" means toward the midline of the body, "lateral" means toward the side of the body or away from the midline of the body, "superior" means upward, and "inferior" means downward under another object or structure. Additionally, with respect to the foot specifically, the term "dorsal" refers to the top of the foot and the term "plantar" refers to the bottom of the foot.

[0019] Similarly, positions or orientations may be used herein with reference to anatomical structures or surfaces. For example, as the current implants, devices, instrumentation, and methods are described herein with reference to use with the bones of the foot, the bones of the foot, ankle, and lower leg may be used to describe the surfaces, positions, directions, or orientations of the implants, devices, instrumentation, and methods. Additionally, the implants, devices, instrumentation, and methods disclosed herein, as well as aspects, components, features, etc. thereof, are described with reference to one side of the body for simplicity. However, because the human body is relatively symmetrical or mirrored about a line of symmetry (the midline), it is expressly contemplated herein that the implants, devices, instrumentation, and methods described and / or illustrated herein, as well as their aspects, components, features, etc., may be changed, varied, modified, reconfigured, or otherwise altered for use with or in association with another side of the body for the same or similar purposes without departing from the spirit and scope of the present invention. For example, implants, devices, instrumentation, and methods described herein with respect to the right foot, as well as their aspects, components, features, etc., may be mirrored to function similarly on the left foot. Additionally, while the implants, devices, instrumentation, and methods disclosed herein, as well as their aspects, components, features, etc., are described with respect to the foot for purposes of brevity, it should be understood that the implants, devices, instrumentation, and methods may also be used with other bones of the body having similar structures.

[0020] The disclosed instruments, implants, systems, assemblies, and related methods for maintaining, correcting, and / or resurfacing joint surfaces are disclosed in U.S. Pat. No. 10,117,749, issued November 6, 2018, entitled "Subtalar Joint Implant," European Patent No. 3,756,626, issued December 30, 2020, entitled "Subtalar Joint Implant," European Patent No. 3,756,626, filed July 15, 2020, entitled "Subtalar Joint Implant," and European Patent No. No. 15770960.1A, U.S. Provisional Patent Application No. 63 / 155100, filed March 1, 2021, entitled “Method of Performing Subtalar Joint Arthroplasty,” U.S. Provisional Patent Application No. 63 / 167965, filed March 30, 2021, entitled “Orthopedic Implants and Methods,” International Patent Application No. PCT / US2019 / 29009, filed April 24, 2019, entitled “Implants and Methods of Use and Assembly,” International Patent Application No. PCT / US2019 / 29009, filed December 12 ... No. PCT / US2019 / 64741, filed on December 13, 2019, entitled “Patient-Specific Instrumentation and Methods of Use”, International Patent Application No. PCT / US2019 / 66336, filed on December 13, 2019, entitled “Patient-Specific Instrumentation and Methods of Use”, and / or International Patent Application No. PCT / US2019 / 66408, filed on December 13, 2019, entitled “Joint Replacement Alignment Guide, System, and Methods of Use and Assembly”, and / or International Patent Application No. PCT / US2019 / 66513, filed on December 13, 2019, entitled “Joint Replacement Alignment Guide, System, and Methods of Use and Assembly”, No. PCT / US2019 / 66149, entitled "Alignment Instruments and Methods for Use in Total Ankle Arthroplasty," filed on December 13, 2019, and / or No. PCT / US2019 / 66393, entitled "Joint Replacement Alignment Guides, Systems, and Methods of Use and Assembly," filed on December 13, 2019, and / or U.S. Provisional Patent Application No. 62 / 898,615, entitled "Resection Guides, Sweeping Reamers, and Methods for Use in Total Ankle Arthroplasty," filed on September 11, 2019;and / or the disclosure of "Distractors with Attachable Paddles for Use in Total Ankle Arthroplasty, Impaction Device," filed on December 13, 2019. No. PCT / US2019 / 66398, entitled "Trial Insert Assembly," filed December 6, 2019; and / or U.S. Provisional Patent Application No. 62 / 899,460, entitled "Total Ankle Arthroplasty Surgical Method," filed September 12, 2019; and / or International Patent Application No. PCT / US2019 / 66404, entitled "Total Ankle Arthroplasty Instruments, Guides, and Related Methods," filed December 13, 2019, which are incorporated herein by reference in their entireties. Similarly, the disclosed instruments, implants, systems, assemblies, and related methods for maintaining, correcting, and / or resurfacing articular surfaces are disclosed in International Patent Application No. PCT / US2019 / 29009, filed April 24, 2019, entitled "Implants and Methods of Use and Assembly Thereof," International Patent Application No. PCT / US2019 / 64741, filed December 12, 2019, entitled "Implant Systems and Methods of Use," International Patent Application No. PCT / US2019 / 66336, filed December 13, 2019, entitled "Patient-Specific Instrumentation and Methods of Use," and International Patent Application No. PCT / US2019 / 66336, filed December 13, 2019, entitled "Patient-Specific Instrumentation and Methods of Use." and / or International Patent Application No. PCT / US2019 / 66408, filed on December 13, 2019, entitled "Joint Replacement Alignment Guide, System, and Methods of Use and Assembly", and / or International Patent Application No. PCT / US2019 / 66149, filed on December 13, 2019, entitled "Alignment Instrument and Method for Use in Total Ankle Arthroplasty", and / or International Patent Application No. PCT / US2019 / 66393, filed on December 13, 2019, entitled "Joint Replacement Alignment Guide, System, and Methods of Use and Assembly",and / or U.S. Provisional Patent Application No. 62 / 898,615, filed on September 11, 2019, entitled "Resection Guide, Sweep Reamer, and Method for Use in Total Ankle Arthroplasty," and / or International Patent Application No. PCT / US2019 / 66398, filed on December 13, 2019, entitled "Distractor with Attachable Paddle, Impaction Device, and Method for Use in Total Ankle Arthroplasty," and / or International Patent Application No. PCT / US2019 / 65025, filed on December 6, 2019, entitled "Trial Insert Assembly," and / or U.S. Provisional Patent Application No. 62 / 899,460, filed on September 12, 2019, entitled "Total Ankle Arthroplasty Surgical Method," No. 16 / 672505, entitled "Talus Formation and Implantation Methods," filed on November 3, 2019; and / or International Patent Application No. PCT / US2021 / 046920, entitled "Total Talus Implants and Methods," and / or International Patent Application No. PCT / US2021 / 047117, entitled "Implants and Methods for Localized Talus Defects," each of which is incorporated herein by reference in its entirety.

[0021] Referring to the drawings, in which like reference numerals are used throughout the various views to indicate like or similar components, and with particular reference to FIGS. 1-8, an exemplary embodiment of a dual-articulating talus replacement system 100 (for brevity, referred to herein as "talus implant system 100") is illustrated. In some aspects, the talus implant system 100 may be configured to replace at least a portion of a patient's talus while articulating with arthroplasty systems and / or components of both the ankle and subtalar joints. Although not shown in the figures, it should be noted that the talus implant system 100 may be modified to another configuration. For example, the talus implant system 100 may be modified from a dual-articulating configuration as illustrated to a single articulating implant configured to articulate with components of arthroplasty systems for the ankle, subtalar, and / or other adjacent joints of the lower extremity. Further to the previous examples, the talar implant system 100 can include a first arculating portion configured to articulate with a total ankle replacement implant and a second arculating portion configured to articulate with a subtalar arthroplasty implant. In some embodiments, the aforementioned total ankle replacement implant and subtalar arthroplasty implant with which the talar implant system 100 may articulate may not be compatible with one another except through implementation of the talar implant system 100 shown as an intermediate component.

[0022] The talus implant system 100 is shown to include a talus implant 110 having a body 112. The body 112 may be configured to occupy at least a portion of the anatomy of the patient's natural talus. In some embodiments, data may be collected (e.g., images, x-rays, etc.) to determine various geometric characteristics and / or volumes of the patient's natural talus such that the talus implant 110 (and portions thereof) is manufactured (e.g., additively manufactured or produced by other manufacturing means) to have one or more characteristics that are the same as and / or similar to the patient's natural talus. In some embodiments, the talus implant 110 may be additively manufactured or otherwise manufactured based on a model developed from image data collected from the patient. For example, the talus implant 110 may be configured to have the same and / or similar geometric characteristics as the patient's natural talus to optimize the fit and integration of the talus implant 110 with the surrounding anatomy. In some embodiments, the talus implant 110 may include various features in addition to those shown and described herein. For example, the talus implant 110 may include one or more bone growth surfaces (e.g., porous, surface texture, etc.) configured to contact anatomical structures adjacent the natural talus and facilitate implantation and retention of the talus implant 110 within the patient, or may include one or more features configured to facilitate fixation (e.g., in a desired location adjacent the patient's anatomy, as part of an arthrodesis with a joint adjacent the natural talus, etc.). It should also be understood that the talus implant 110 shown and described herein may include one or more of the features, shapes, or other characteristics of the talus implants shown and described in the pending patent applications referenced above and incorporated herein by reference in their entireties.Similarly, it should be understood that the talar implant 110 may also include one or more features of an ankle arthroplasty system and / or a subtalar arthroplasty system (or other arthroplasty systems for the ankle joint, subtalar joint, and / or other joints adjacent the talus), including but not limited to those identified above and incorporated by reference in their entirety herein.

[0023] The talar implant 110 is further shown to include a first joint 120 (e.g., tibial joint, proximal joint, superior joint, etc.) disposed on the upper (e.g., superior, proximal, tibial, etc.) portion of the talar implant 110 (so superior relative to the body 112), the first joint 120 having an articularing surface 122. The illustrated first joint 120 and articular surface 122 may be the same as or similar to the articular of the talar component of the Apex 3D® Total Ankle Arthroplasty System (or other similar systems) developed by Paragon 28, Inc., which are disclosed in the previously listed published patents and pending patent applications, which are incorporated herein by reference in their entireties. In some embodiments, the articular surface 122 may include various radii of curvature (e.g., sagittal radii) over various regions of the articular surface. For example, the articular surface 122 may include different radii across its anterior-medial, anterior-lateral, posterior-medial, and posterior-lateral quadrants. Additionally, in some embodiments, various quadrants may have larger / smaller radii than other adjacent quadrants (e.g., the anterior-lateral quadrant has a larger radius of curvature than the anterior-medial quadrant, the posterior-medial quadrant has a larger radius of curvature than the posterior-lateral quadrant, etc.). As illustrated, the first joint 120 is disposed substantially on top of the body 112, although the placement of the first joint 120 relative to the body 112 may be in alternative placements based on analysis of image data or other data (e.g., image data from a patient).

[0024] The talar implant 110 is also shown to include a second joint 130 (e.g., inferior, distal, calcaneal, etc.) disposed on a lower (e.g., inferior, distal, calcaneal, etc.) portion of the talar implant 110 (so that it is inferior to the body 112 and / or on the opposite side of the body 112 from the first joint 120), the second joint 130 having an articular surface 132. The illustrated second joint 130 and articular surface 132 may be the same as or similar to the articular surface of one or more subtalar arthroplasty implants disclosed, for example, in the published patents and pending patent applications listed above and incorporated herein by reference in their entireties. In some embodiments, the articular surface 132 may include various features configured to engage (e.g., articulate, releasably couple, pivot, etc.) with corresponding features of one or more components of one or more subtalar arthroplasty systems (including but not limited to those incorporated herein by reference). For example, the articular surface 132 may include lateral boundaries (e.g., elongated protrusions) configured to constrain movement of one or more subtalar arthroplasty components relative to the talar implant 110 (and / or vice versa). As shown, the second articulation 130 is disposed substantially inferiorly relative to the body 112, although the placement of the second articulation 130 relative to the body 112 may be in an alternative location based on analysis of image data or other data (e.g., image data from a patient).

[0025] 1-7, the talar implant system 100 is shown to include an ankle arthroplasty system 200, according to an exemplary embodiment. It should be understood that the ankle arthroplasty system 200 may be the same as and / or similar to the APEX 3D® ankle arthroplasty system developed by Paragon 28, Inc. (as shown and described in the patents and pending applications incorporated herein by reference). However, the ankle arthroplasty system 200 may include various components of various ankle arthroplasty systems (e.g., APEX 3D®, etc.) configured to articulate (interface, engage, releasably couple, etc.) with various components of the talar implant system 100. For example, the ankle arthroplasty system 200 is shown to include an intermediate component 210 configured to mate with a tibial component 220 configured for implantation into a patient's distal tibia (e.g., an upper surface 222 of the tibial component 220 may include features / shapes, e.g., a bone growth surface, configured to facilitate implantation into the distal tibia). The intermediate component 210 includes an upper surface 212 that may include one or more features configured to facilitate releasable mating or other engagement with a lower surface 224 of the tibial component 220. The intermediate component 210 is further shown to include a lower surface 214 configured to interface with the articular surface 122 of the first joint 120 of the talar implant 110. In some embodiments, the intermediate component may include one or more polymeric materials, such as, for example, Vitamin E-infused UHMWPE and / or highly crosslinked polymeric materials. Additionally, in some embodiments, the intermediate component may be configured to articulate with either the first joint 120 of the talar implant 110 or the upper surface of the talar component of a total ankle arthroplasty system (e.g., APEX 3D®), where the upper surfaces of both the talar implant 110 and the talar component have the same or similar shapes.It should be understood that the talar implant 100, the intermediate component 210, and the tibial component 220 may be configured to move (e.g., articulate, translate, etc.) relative to one or more of the other components of the ankle arthroplasty system 200.

[0026] 1-8, the talar implant system 100 is shown to include a subtalar arthroplasty system 300 according to an exemplary embodiment. It should be understood that the subtalar arthroplasty system 300 may be the same as and / or similar to other subtalar arthroplasty systems shown and described in the patents and pending applications incorporated herein by reference. However, the subtalar arthroplasty system 300 may include various components of various subtalar arthroplasty systems configured to articulate (interface, engage, releasably couple, etc.) with various components of the talar implant system 100. For example, the subtalar arthroplasty system 300 is shown to include a middle component 310 having an upper surface 312 configured to articulate with the articular surface 132 of the second joint 130 of the talar implant 110. In some embodiments, the intermediate component 310 may have a size and / or shape complementary to at least a portion of the articular surface 132, e.g., configured such that the intermediate component 310 is held in a desired position relative to the talar implant 110 and bound by one or more elongated projections extending from the articular surface 132. The subtalar arthroplasty system 300 is further shown to include a calcaneus component 320 configured to be implanted adjacent to and / or in conjunction with a patient's calcaneus. In some embodiments, an inferior surface 324 of the calcaneus component 320 may include one or more features (e.g., bone growth surface, porous, etc.) configured to promote incorporation with the patient's calcaneus. The calcaneus component 320 is shown to include an superior surface 322 configured to articulate with an inferior surface of the intermediate component 310. In some embodiments, the intermediate component 310 may include one or more features configured to engage (e.g., releasably couple, etc.) with one or more corresponding features of the calcaneus component 320.It should be understood that in some embodiments, one or more of the talar implant 310, the intermediate component 310, and the calcaneal component 320 may be configured to articulate (e.g., move, pivot, etc.) relative to one or more other components of the subtalar arthroplasty system 300.

[0027] The terms used herein are for the purpose of describing particular embodiments only and are not intended to be limiting of the present invention. As used herein, the singular forms "a," "an," and "the" are intended to include the plural unless the context clearly dictates otherwise. Additionally, the terms "comprise" (and any form of comprise, such as "comprises" and "comprising"), "have" (and any form of have, such as "has" and "having"), "include" (and any form of include, such as "includes" and "including"), and "contain" (and any form of contain, such as "contains" and "containing") are understood to be open-ended linking verbs. As a result, a method or apparatus that "comprises," "has," "includes," or "contains" one or more steps or elements has those one or more steps or elements, but is not limited to having only those one or more steps or elements. Similarly, a method step or apparatus element that "comprises," "has," "includes," or "contains" one or more features has those features or features, but is not limited to having only those features or features. Further, an apparatus or structure that is configured in a certain way is configured in at least that way, but may also be configured in ways not recited.

[0028] The present invention has been described with reference to preferred embodiments. It will be understood that the architectural and operational embodiments described herein are illustrative of several possible configurations for providing the same general features, characteristics, and general system operations. Changes and modifications will occur to others upon reading and understanding the foregoing detailed description. It is intended that the present invention be construed as including all such changes and modifications.

Claims

1. A tibial implant component; A calcaneal implant component; a talar implant component; Equipped with Implant system.

2. moreover, a first intermediate component disposed between the talar implant component and the tibial implant component; a second intermediate component disposed between the talar implant component and the calcaneal implant component; Equipped with The implant system of claim 1 .

3. The talar implant component comprises: a first articular surface configured to engage the first intermediate component; a second articular surface configured to engage the second intermediate component; and Equipped with The implant system of claim 2.

4. the first articular surface is disposed on a superior surface of the talar implant component and the second articular surface is disposed on an inferior surface of the talar implant component. The implant system according to claim 3.

5. The tibial implant component includes a first engagement surface on a top surface thereof configured to engage at least a portion of the patient's tibia. The implant system according to claim 4.

6. the tibial implant component includes a second engagement surface on a lower surface thereof configured to engage a superior surface of the first intermediate component; The implant system according to claim 5.

7. a first articular surface of the talar implant component configured to engage an inferior surface of the first intermediate component; The implant system according to claim 6.

8. the calcaneal implant component includes a first engagement surface on an upper surface thereof configured to engage a lower surface of the second intermediate component; The implant system according to claim 4.

9. the calcaneal implant component includes a second engagement surface on an underside thereof configured to engage at least a portion of the patient's calcaneus; The implant system according to claim 8.

10. the second articular surface of the talar implant component is configured to engage a superior surface of the second medial component. The implant system according to claim 8.

11. the first articular surface comprises a plurality of radii; The implant system according to claim 4.

12. the plurality of radii are different for an anterior medial quadrant, an anterior lateral quadrant, a posterior medial quadrant, and a posterior lateral quadrant of the first articular surface; The implant system of claim 11.

13. In the first articular surface, the radius of curvature of the anterior medial quadrant is smaller than the radius of curvature of the anterior lateral quadrant, and the radius of curvature of the posterior medial quadrant is larger than the radius of curvature of the posterior lateral quadrant.

13. An implant system according to claim 12.

14. the second articular surface includes at least one elongated projection, the at least one elongated projection configured to constrain motion of a subtalar arthroplasty component. The implant system of claim 10.

15. An intermediate component; A calcaneal implant component; Equipped with Subtalar Arthroplasty System.

16. the intermediate component comprises an upper surface, the upper surface configured to articulate with an articular surface of a talar implant component; The subtalar arthroplasty system of claim 15.

17. the superior surface being sized to be complimentary to at least a portion of the articular surface of the talar implant component; The subtalar arthroplasty system of claim 16.

18. The calcaneal implant component comprises an inferior surface. The subtalar arthroplasty system of claim 15.

19. the lower surface of the calcaneal implant component includes a plurality of surface features to facilitate engagement of the lower surface with the calcaneal bone; 20. The subtalar arthroplasty system of claim 18.

20. At least one of the plurality of surface features is a post.

20. The subtalar arthroplasty system of claim 19.

Images