Ankle implant with self-aligning feature

Abstract

The present disclosure provides a prosthetic ankle including a talar component having atop surface and a bottom surface. The bottom surface is configured to be positioned adjacent to a talus bone and includes at least one talar peg extending away from the bottom surface. The at least one talar peg is configured to align the talar component with the talus bone when inserted into a corresponding hole formed in the talus bone.

Description

ANKLE IMPLANT WITH SELF- ALIGNING FEATURECROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of priority to U.S. Provisional Application No. 63 / 756,454 entitled “Ankle Implant with Self-Aligning Feature,” filed on February 10, 2025, the contents of each of which are hereby incorporated by reference in its entirety.BACKGROUND

[0002] Total ankle replacement addresses severe ankle arthritis by replacing damaged joint anatomy with prosthetic components, aiming to relieve pain, improve mobility, and enhance overall quality of life. Surgeons commonly use an anterior approach for ankle replacement surgery, as it provides access to the joint space with minimal disruption to surrounding tissues. Despite its minimally invasive nature, this approach poses challenges due to limited visibility and restricted working space, complicating the design of instruments and implants that can precisely prepare bone, ensure accurate positioning, and achieve secure fixation for both immediate and long-term outcomes.

[0003] Talar implantation, in particular, presents unique challenges due to poor visibility, the complex anatomy of the surrounding structures, and the intricate interface between the talus bone and adjacent tissues. Typically, talar implants are secured using features such as pegs, bosses, or other projections that extend into prepared channels in the bone. These features are inserted with a line-to-line or slight press fit to promote stability and encourage osseointegration.

[0004] For these fixation features to function effectively, accurate alignment of the implant with the prepared bone is critical. Misalignment or off-centered positioning during insertion can damage the bone surface, reduce implant-to-bone contact, and compromise longterm stability.

[0005] Disclosed herein are prosthetic implants that provide improved alignment and fixation to the prepared bone surface.SUMMARY

[0006] The present disclosure relates to a talar component for a prosthetic ankle. The talar component described herein is configured to naturally align with a prepared bone, achieving optimal implant location and orientation to the prepared bone.

[0007] In one aspect, a prosthetic ankle is provided. The prosthetic ankle includes a talar component having a top surface and a bottom surface. The bottom surface is configured to be positioned adjacent to a talus bone and includes at least one talar peg extending away from the bottom surface. The at least one talar peg is configured to guide the talar component into the talus bone when inserted into a corresponding hole formed in the talus bone.

[0008] In another aspect, a method of attaching a talar component of a prosthetic implant to a talus bone of a patient is provided. The method includes drilling at least one hole in the talus bone; positioning at least one cylindrical talar peg of the talar component with the at least one hole; and inserting the at least one cylindrical talar peg of the talar component into the at least one hole. The at least one cylindrical talar peg guides the talar component into the at least one hole disposed in the talus bone.

[0009] These as well as other aspects, advantages, and alternatives, should become apparent to those having ordinary skill in the art by reading the following detailed description, with reference where appropriate to the accompanying drawings.BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a side view of an example talar component of a prosthetic ankle.

[0011] Figure 2 is a detailed view of a talar peg of the talar component of Figure 1.

[0012] Figure 3 is a side view of an example talar component engaging a talus bone of a patient.

[0013] Figure 4 is a side view of an example talar component implanted into a talus bone of a patient.DETAILED DESCRIPTION

[0014] As discussed above, the effective functioning of a talar implant requires accurate alignment with the talus bone. Misalignment or off-center positioning during insertion can damage the talus bone surface, reduce implant-to-bone contact, and compromise long-term stability.

[0015] To address these challenges, a prosthetic ankle with an improved talar component is provided. The talar component includes at least one talar peg that is configured to guide the talar component into a corresponding hole formed in the talus bone. The at least one talar peg includes a cylindrical body having a multi-width lead-in shape, which includes a first portion and a second portion with different diameters. A transition chamfer is disposedbetween the first portion and second portion and is configured to transition a diameter of the second portion to a diameter of the first portion of the talar peg.

[0016] The multi-width lead-in shape and transition chamfer improve the efficiency of alignment and insertion of the talar peg into a corresponding hole in the talus bone. For example, a looser interference is employed between the first portion of the talar peg and the corresponding hole during the initial stages of insertion. This looser fit facilitates easier guidance and alignment of the talar peg into the hole. As the second portion of the talar peg is advanced into the corresponding hole, the transition chamfer is configured to gradually increase interference between the at least one talar peg and the corresponding hole disposed in the talus bone, thus creating a tighter and secure fit.

[0017] The talar component described herein reduces the risk of misalignment, ensures precise placement of the talar component during insertion, and enhances the overall stability and functionality of the prosthetic ankle. The inclusion of at least one talar peg with a multiwidth lead-in shape and a transition chamfer allows for controlled insertion, gradually guiding the talar peg into the corresponding hole. Thus, the disclosed configuration of the talar component allows the talar component to be self-aligning.

[0018] The talar component described herein also allows for mobility similar to the native ankle joint by allowing for coupled motion during flexion and extension. The talar component allows for internal rotation and inversion as the ankle moves into plantarflexion and external rotation and eversion as the ankle moves into dorsiflexion.

[0019] With reference to the Figures, Figure 1 illustrates an example talar component 100 of a prosthetic ankle. The talar component 100 includes a body 101 having a top surface 102, a bottom surface 104 opposite the top surface 102, an anterior side 106, and a posterior side 108 opposite the anterior side 106. The body 101 also includes two side surfaces 110 that connect the top surface 102 to the bottom surface 104, as well as the anterior side 106 to the posterior side 108.

[0020] In some examples, the body 101 may be made from cobalt-chromium (CoCr) alloys, ceramic alloys, oxidized Zirconium, and Nitride coated Titanium alloys for improved wear resistance. However, CoCr and the previously mentioned materials are dense materials, whose increased weight can cause increased wear against the less dense bone that the implant resides upon. In order to minimize such wear and reduce the weight of the implant, while preserving the desirable properties of CoCr, weight reducing mechanisms are desirable. Thus, in some examples, an interior of the body 101 of the talar component 100 may be hollow. Inone such example, the interior of the body 101 may include a lattice structure. In such an example, an entirety of the interior of the body 101 comprises the lattice structure. In another example, the interior of the body 101 may include alternating solid layers and lattice structure layers. The solid and lattice layers can be manufactured from material such as CoCr or a variation of mixed material layers. This same material may also comprise the shell of the body 101 as well. The lattice structure positioned in the hollow interior of the body 101 that adds strength to the implant can be either be a uniform beam design or a formula driven gyroid shape.

[0021] Referring back to Figure 1, the top surface 102 is configured to interact with a corresponding bearing surface of the prosthetic ankle. The top surface 102 is configured to provide a smooth and contoured interface that aligns with a bottom surface of a bearing surface of the prosthetic ankle. This configuration enables controlled relative motion between the talar component 100 and a tibial component, facilitating the flexion and extension movements of the prosthetic ankle.

[0022] For example, the talar component 100 may include a bearing surface and a tibial component having a top surface configured to be positioned adjacent to a tibia and a bottom surface configured to be positioned adjacent atop surface ofthe bearing surface. In an example, the bearing surface comprises ultra-high-molecular-weight polyethylene (UHMWPE). In an example, a bottom surface of the bearing surface is configured to substantially match the top surface 102 of the talar component 100 such that the bearing surface and tibial component can move relative to one another and frictionally engage one another on the top surface of the bearing surface. In an example, the bottom surface of the bearing surface is configured for at least partially constraining a mobility of the bearing surface relative to the tibial component.

[0023] Additionally, in some examples, the top surface 102 may include specific geometries or features, such as grooves or curvatures, to enhance stability and ensure proper alignment with the bearing surface during use. These features help distribute loads evenly across the joint and minimize wear over time.

[0024] The anterior side 106 and posterior side 108 are structured to provide secure attachment points or interfaces for other components of the prosthetic assembly. For instance, the anterior side 106 may accommodate attachment mechanisms that prevent dislocation, while the posterior side 108 may support movement and articulation during gait cycles.

[0025] The bottom surface 104 is configured to be positioned adjacent to the talus of a patient. As shown in Figure 1, the talar component 100 includes one or more talar pegs 120extending away from the bottom surface 104. In an example, one or more talar pegs 120 comprise a pair of talar pegs. In use, the one or more talar pegs 120 are configured to be positioned within the talus of the patient and guide the talar component 100 into alignment with the talus when inserted into corresponding holes formed in the talus.

[0026] Each talar peg 120 has an elongated cylindrical shape. However, the shape and form of the talar pegs 120 are not limited to the configurations disclosed herein and may be formed in alternative shapes. Each talar peg 120 extends outward a predetermined distance X from the bottom surface 104. The predetermined distance X may be at least 1 millimeter, at least 5 millimeters, at least 10 millimeters, at least 15 millimeters, or at least 20 millimeters.

[0027] Additionally, as illustrated in Figure 1, each talar peg 120 is angled A between 0 and 90 degrees relative to a plane 105 of the bottom surface 104 of the talar component 100. Alternatively, in another example, the talar pegs 120 are positioned perpendicularly to the bottom surface 104.

[0028] For example, non-perpendicular angulations (e.g., 15, 30, or 45 degrees) may be employed to accommodate specific anatomical constraints or to provide enhanced anchoring in cases where the bone surface is irregular or asymmetrical. These angled configurations ensure that the talar pegs 120 engage securely with the prepared bone channels, further enhancing the overall stability of the implant.

[0029] Alternatively, in one example, the talar pegs 120 are oriented perpendicularly (i.e., at a 90-degree angle) to the bottom surface 104, providing a straight insertion trajectory that maximizes stability and load distribution. Such perpendicular alignment may be desired when the prepared bone surface is flat or uniformly shaped, as it enhances implant-to-bone contact and facilitates precise positioning during implantation.

[0030] In some examples, the talar component 100 may include a porous structure positioned adjacent to the bottom surface 104. In an example, the porous structure may include separate surfaces or structures that are sintered, diffusion bonded, or additively manufactured to the bottom surface 104. The porous structure may advantageously promote bone ingrowth / on growth of the talar component 100.

[0031] In some examples, at least a portion of an exterior surface of the bottom surface 104 may include a Zinc- Strontium (Zn-Sr) alloy. In such an example, the Zn-Sr alloy is selected from the group consisting of Zn-Sr, Zn-0.8Sr, Zn-0.6 Sr, Zn-O.SSr, Zn-0.4Sr, Zn-0.2Sr, and Zn-0.1 Sr. Once the second end of the prosthetic implant is in contact with the bone of the patient, the Zn-Sr alloy stimulates osteogeneis of mesenchymal stem cells at the implant site.In an example, the Zn-Sr alloy stimulates mesenchymal stem cells selected from the group consisting of CD45-, CD457CD146+, CD45-CD271+, CD31-44+45-73+90+105+, and CD45-CD34+. Further, the Zn-Sr alloy increases cellular PI3K / Akt, MAPK / Erk, and / or Wnt / p-catenin pathway signaling, thereby promoting anabolic and anticatabolic effects on bone remodeling. In an example, the Zn-Sr alloy further includes a material selected from the group consisting of tricalcium phosphate (TCP), hydroxyapatite (HA), and Silicon. In another example, the Zn-Sr alloy includes no more than a trace amount of Magnesium.

[0032] The addition of Zn-Sr based metals to the bottom surface 104 of the talar component 100 for total ankle replacement surgeries would help promote and / or stimulate new bone formation while also inhibiting bone resorption during the healing process thereby reducing potential failure modes associated with implant loosening and subsidence.

[0033] In some examples, the top surface 102 of the talar component 100 is configured to extend away from the bone after implantation of the prosthetic implant in the bone. In one such example, an exterior surface of the top surface 102 of the talar component 100 comprises a first material, and the exterior surface of the bottom surface 104 of the talar component 100 comprises a second material that is different from the first material. In one such example, the first material comprises a titanium alloy, stainless steel, polyetheretherketone (PEEK), or a CoCr alloy, and the second material comprises the Zn-Sr alloy.

[0034] In some examples, the Zn-Sr alloy comprises a three-dimensional structure extending away from the exterior surface of the bottom surface 104. In one such example, the three-dimensional structure comprises a scaffold.

[0035] One or more components of the talar component 100 may be made via an additive manufacturing process using an additive -manufacturing machine, such as multi-jet modeling, selective laser sintering / melting, and fused filament fabrication, among other possibilities. Additive manufacturing enables one or more components of the talar component 100 and other physical objects to be created as intraconnected single-piece structure through the use of a layer-upon-layer generation process. Additive manufacturing involves depositing a physical object in one or more selected materials based on a design of the object. For example, additive manufacturing can generate one or more components of the talar component 100 using a Computer Aided Design (CAD) of the talar component 100 as instructions. As a result, changes to the design of the talar component 100 can be immediately carried out in subsequent physical creations of the talar component 100. This enables the components of the talarcomponent 100 to be easily adjusted or scaled to fit different types of applications (e.g., for use with various types and sizes of prosthetic ankles).

[0036] The layer-upon-layer process utilized in additive manufacturing can deposit one or more components of the talar component 100 with complex designs that might not be possible for devices assembled with subtractive manufacturing. In turn, the design of the talar component 100 can include aspects that aim to improve overall operation. For example, the design can incorporate physical elements that help redirect stresses in a desired manner that traditionally manufactured devices might not be able to replicate.

[0037] Additive manufacturing also enables depositing one or more components of the talar component 100 in a variety of materials using a multi-material additive -manufacturing process. In such an example, the majority of the talar component 100 may be made from a first material and lattice structure and / or the porous structure may be made from a second material that is different than the first material. In another example, the entire talar component 100 is made from the same material. Other example material combinations are possible as well. Further, one or more components of the talar component 100 can have some layers that are created using a first type of material and other layers that are created using a second type of material.

[0038] Figure 2 provides a detailed view of a single talar peg 120 of the pair of talar pegs 120 from the talar component 100 shown in Figure 1. The talar peg 120 is configured to include two different portions have varying shapes, sizes, and materials to perform distinct roles during the insertion process and final implanted state.

[0014] Referring now to Figure 2, the talar peg 120 features a first portion 122 with a first end 123 and a second end 124, and a second portion 125 with a first end 126 and a second end 127. The second end 127 of the second portion 125 is directly coupled to the bottom surface 104 of the talar component 100, ensuring stable attachment to the talar component. The first end 126 of the second portion 125 is directly connected to the second end 124 of the first portion 122, forming a seamless and continuous structure that provides structural integrity during insertion and use.

[0015] The second portion 125 of the talar peg 120 has a larger diameter than the first portion 122, which enhances stability by increasing the surface area in contact with the bone. The second portion 125 may be made from a porous material, such as CoCr, titanium or a composite, designed to promote osseointegration. This porous material encourages bone tissue growth into the peg, creating a strong biological bond between the implant and the surroundingbone. In contrast, the first portion 122 of the talar peg 120 is made of metal, such as titanium or stainless steel, which provides mechanical strength and ensures long -lasting performance. The first portion 122 has a smaller diameter compared to the second portion 125.

[0016] As mentioned earlier, the initial width or shape (i.e., the first portion 122) of the talar peg 120 helps guide, align, and seat the talar component 100 into the bone during insertion. The final width or shape (i.e., the second portion 125) ensures secure engagement and stability once the implant is fully seated.

[0017] The talar peg 120 also includes a transition chamfer 130 positioned between the first end 126 of the second portion 125 and the second end 124 of the first portion 122. As depicted in Figure 2, a plane 132 of the transition chamfer 130 is parallel to the plane 105 of the bottom surface 104.

[0018] The transition chamfer 130 is configured to gradually transition the diameter of the second portion 125 to the diameter of the first portion 122, facilitating in the precise alignment of the talar peg 120 when inserted into a corresponding hole in the talus.

[0019] The geometry of the transition chamfer 130 of the talar peg 120 is configured to allow multiple talar pegs 120 to be inserted and come into contact with the bone at the same time so that the bottom surface 104 of the implant remains parallel to the bone during inserted.

[0020] For examples, many pegs, even those with chamfers, allow for the implant to toggle / rotate while being inserted because the chamfers are a constant angle and do not contact the bone at the same time, leading to drilled holes that become oversized. This issue arises because most chamfers maintain a constant angle, which prevents uniform bone contact during insertion.

[0021] The transition chamfer 130 of each talar peg 120 includes a variable angle that is configured based on the corresponding talar peg’s 120 insertion angle and its interaction with the bone. This circumferentially varying angle ensures that the porous second portion 125 of all talar pegs 120 engages the bone simultaneously, enhancing initial stability and preventing misalignment. The ability to vary the transition chamfer’s 130 angle per talar peg 120 orientation allows for optimal seating and maximized contact with the bone surface, ultimately contributing to the implant’s long-term success.

[0022] Figures 3 and 4 illustrate an example implementation of the talar component 100 attaching to a talus 200 of a patient. In particular, Figure 3 is a side view of the talar component 100 engaging the talus 200 of the patient. Figure 4 is a side view of the talar component 100 implanted into the talus 200 of the patient.

[0023] Referring now to Figure 3, each talar peg 120 is inserted into corresponding holes 220 drilled into the talus 200. As each talar peg 120 is inserted, the first portion 122 of the talar peg 120 aligns precisely with the corresponding hole 220 in the talus 200. The diameter of the first portion 122 ensures that the initial engagement of the talar peg 120 with the hole 220 is accurately aligned.

[0024] As the talar pegs 120 are further inserted into the corresponding holes 220, the transition chamfer 130 on each talar peg 120 facilitates the gradual advancement of the second portion 125 into the corresponding hole 220. The transition chamfer 130 is a beveled edge that gradually increases the interference between the talar peg 120 and the corresponding hole 220 in the talus 200. The transition chamfer 130 aligns the talar peg 120 into place, making the insertion smoother and more controlled. For example, the transition chamfer 130 aligns an axis AX1 of the at least one talar peg 120 with an axis AX2 of the corresponding hole 220 disposed in the talus 200. Thus, each talar peg 120 is configured to guide the talar component 100 into alignment with the talus 200 to accurately seat the talar component 100 to the talus 200 as shown in Figure 4.

[0025] Referring now to Figure 4, the second portion 125 of each talar peg 120 is press fit into the corresponding hole 220 of the talus 200. Due to the larger diameter of the second portion 125 of each talar peg 120, the press fit provides greater stability and secure attachment to the talus 200, ensuring that the talar component 100 remains firmly aligned and fixed in position once seated.

[0026] A method of attaching a talar component of a prosthetic implant to a talus of a patient, in accordance with example examples, is provided herein. The method includes drilling at least one hole into the talus bone, and positioning at least one cylindrical talar peg 120 of the talar component 100 over the drilled hole(s) in the talus. The talar pegs 120 are configured to be inserted into the corresponding drilled holes in the talus and are configured to secure the talar component 100 to the talus. The method also includes inserting the talar pegs 120 into the corresponding holes drilled into the talus. In particular, the talar pegs 120 guide the talar component 100 into the bone, ensuring proper alignment with the prepared holes. As a result, all of the talar pegs 120 engage the bone simultaneously, enhancing initial stability and preventing misalignment.

[0027] It should be understood that arrangements described herein are for purposes of example only. As such, those skilled in the art should appreciate that other arrangements and other elements (e.g. machines, interfaces, functions, orders, and groupings of functions, etc.)can be used instead, and some elements may be omitted altogether according to the desired results. Further, many of the elements that are described are functional entities that may be implemented as discrete or distributed components or in conjunction with other components, in any suitable combination and location, or other structural elements described as independent structures may be combined.

[0028] While various aspects and examples have been disclosed herein, other aspects and examples should be apparent to those having ordinary skill in the art. The various aspects and examples disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope being indicated by the following claims, along with the full scope of equivalents to which such claims are entitled. It is also to be understood that the terminology used herein is for the purpose of describing particular examples only, and is not intended to be limiting.

[0029] Example methods and systems are described herein. It should be understood that the words “example,” “exemplary,” and “illustrative” are used herein to mean “serving as an example, instance, or illustration.” Any example or feature described herein as being an “example,” being “exemplary,” or being “illustrative” is not necessarily to be construed as preferred or advantageous over other examples or features. The examples described herein are not meant to be limiting. It should be readily understood that the aspects of the present disclosure, as generally described herein, and illustrated in the figures, can be arranged, substituted, combined, separated, and designed in a wide variety of different configurations, all of which are explicitly contemplated herein.

[0030] Furthermore, the particular arrangements shown in the Figures should not be viewed as limiting. It should be understood that other examples may include more or less of each element shown in a given Figure. Further, some of the illustrated elements may be combined or omitted. Yet further, an example may include elements that are not illustrated in the Figures.

[0031] In the following description, numerous specific details are set forth to provide a thorough understanding of the disclosed concepts, which may be practiced without some or all of these particulars. In other instances, details of known devices and / or processes have been omitted to avoid unnecessarily obscuring the disclosure. While some concepts are described in conjunction with specific examples, it should be understood that these examples are not intended to be limiting.

[0032] As used herein, “coupled” means associated directly as well as indirectly. For example, a member A may be directly associated with a member B, or may be indirectly associated therewith, e.g., via another member C. It should be understood that not all relationships among the various disclosed elements are necessarily represented.

[0033] Unless otherwise indicated, the terms “first,” “second,” etc. are used herein merely as labels, and are not intended to impose ordinal, positional, or hierarchical requirements on the items to which these terms refer. Moreover, reference to, e.g., a “second” item does not require or preclude the existence of, e.g., a “first” or lower-numbered item, and / or, e.g., a “third” or higher-numbered item.

[0034] Reference herein to “one embodiment” or “one example” or “an example” means that one or more feature, structure, or characteristic described in connection with the example is included in at least one implementation. The phrases “one embodiment” or “one example” or “an example” in various places in the specification may or may not be referring to the same example.

[0035] As used herein, a system, apparatus, structure, article, element, component, or hardware “configured to” perform a specified function is indeed capable of performing the specified function without any alteration, rather than merely having potential to perform the specified function after further modification. In other words, the system, apparatus, structure, article, element, component, or hardware “configured to” perform a specified function is specifically selected, created, implemented, utilized, programmed, and / or designed for the purpose of performing the specified function. As used herein, “configured to” denotes existing characteristics of a system, apparatus, structure, article, element, component, or hardware which enable the system, apparatus, structure, article, element, component, or hardware to perform the specified function without further modification. For purposes of this disclosure, a system, apparatus, structure, article, element, component, or hardware described as being “configured to” perform a particular function may additionally or alternatively be described as being “adapted to” and / or as being “operative to” perform that function.

[0036] The limitations of the following claims are not written in means-plus-fiinction format and are not intended to be interpreted based on 35 U.S.C. § 112(f), unless and until such claim limitations expressly use the phrase “means for” followed by a statement of function void of further structure.

[0037] By the term “about,” “approximately,” or “substantially” with reference to amounts or measurement values described herein, it is meant that the recited characteristic,parameter, or value need not be achieved exactly, but that deviations or variations, including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide. For example, in one example, the term “about” can refer to ± 5% of a given value.

[0038] Illustrative, non-exhaustive examples, which may or may not be claimed, of the subject matter according to the present disclosure are provided below.

Claims

CLAIMSWhat is claimed is:

1. A prosthetic ankle comprising:a talar component having a top surface and a bottom surface,wherein the bottom surface is configured to be positioned adjacent to a talus bone, wherein the bottom surface includes at least one talar peg extending away from the bottom surface, andwherein the at least one talar peg is configured to guide the talar component into the talus bone when inserted into a corresponding hole formed in the talus bone.

2. The prosthetic ankle of claim 1, wherein the at least one talar peg is angled between 0 and 90 degrees with respect to the bottom surface of the talar component.

3. The prosthetic ankle of any one of claims 1-2, wherein the at least one talar peg is perpendicular to the bottom surface of the talar component.

4. The prosthetic ankle of any one of claims 1-3, wherein the at least one talar peg is cylindrical in shape.

5. The prosthetic ankle of any one of claims 1 -4, wherein the at least one talar peg comprises a first portion having a first end and a second end, and a second portion having a first end and a second end, wherein the second end of the second portion is directly coupled to the bottom surface, andwherein the first end of the second portion is directly coupled to the second end of the first portion.

6. The prosthetic ankle of claim 5, wherein the second portion has a greater diameter than a diameter of the first portion.

7. The prosthetic ankle of any one of claims 5-6, wherein the second portion is made of a porous material, and wherein the first portion is made of metal.

8. The prosthetic ankle of any one of claims 5-7, wherein the talar peg further comprises a transition chamfer positioned between the first end of the second portion and the second end of the first portion.

9. The prosthetic ankle of claim 8, wherein the transition chamfer is configured to align an axis of the at least one talar peg with an axis of the corresponding hole disposed in the talus bone.

10. The prosthetic ankle of any one of claims 8-9, wherein transition chamfer is configured to gradually increase an interference between the at least one talar peg and the corresponding hole disposed in the talus bone.

11. The prosthetic ankle of any one of claims 8-10, wherein the transition chamfer is configured to transition a diameter of the second portion to a diameter of the first portion to align the at least one talar peg inserted into the corresponding hole disposed in the talus bone.

12. The prosthetic ankle of any one of claims 8-11, wherein a plane of the transition chamfer is parallel to a plane of the bottom surface.

13. The prosthetic ankle of any one of claims 1-12, wherein an interior of the talar component is hollow.

14. The prosthetic ankle of claim 13, wherein the interior of the talar component includes a lattice structure.

15. The prosthetic ankle of claim 14, wherein the interior of the talar component includes alternating solid layers and lattice structure layers.

16. The prosthetic ankle of any one of claims 1-15, further comprising:a bearing surface; anda tibial component having a top surface configured to be positioned adjacent to a tibia and a bottom surface configured to be positioned adjacent a top surface of the bearing surface.

17. The prosthetic ankle of claim 16, wherein a bottom surface of the bearing surface is configured to substantially match the top surface of the talar component such that the bearing surface and tibial component can move relative to one another and frictionally engage one another on the top surface of the bearing surface.

18. A method of attaching a talar component of a prosthetic implant to a talus bone of a patient, the method comprising:drilling at least one hole in the talus bone;positioning at least one cylindrical talar peg of the talar component with the at least one hole; andinserting the at least one cylindrical talar peg of the talar component into the at least one hole,wherein the at least one cylindrical talar peg guides the talar component into the at least one hole disposed in the talus bone.

19. The method of claim 18, wherein the at least one cylindrical talar peg comprises: a first portion;a second portion; anda transition chamfer disposed between the first portion and the second portion, wherein the transition chamfer aligns an axis of the at least one cylindrical talar peg with an axis of the at least one hole disposed in the talus bone.

20. The method of claim 19, wherein the transition chamfer is a beveled edge that transitions a diameter of the second portion to a diameter of the first portion, and wherein the diameter of the second portion is greater than the diameter of the first portion.

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