Calcaneal prosthesis

1. A calcaneal prosthesis system, comprising:

a body sized and shaped to replace a calcaneus, the body having a dorsal surface, a plantar surface, an anterior surface, and a posterior end,

the posterior end having a tuberosity that approximates a shape of a calcaneal tuberosity,

the anterior surface shaped for engaging at least one of a cuboid bone or a mid-foot bone,

the dorsal surface shaped for engaging at least one of a talus bone or a distal tibia,

the body having a first pre-formed surface defining a hole extending therethrough for receiving an intramedullary (IM) nail, the hole extending from the plantar surface of the body to the dorsal surface.

2. The calcaneal prosthesis system of claim 1 , wherein:

the body has a medial surface and a lateral surface, and

the posterior end, the anterior surface, the dorsal surface, the medial surface, or the lateral surface has at least one fastener opening extending to the hole.

3. The calcaneal prosthesis system of claim 2 , wherein the at least one fastener opening is oriented at an oblique angle relative to the hole.

4. The calcaneal prosthesis system of claim 2 , further comprising an intramedullary (IM) nail shaped to extend through the hole, the IM nail having at least one aperture configured to receive at least one fastener extending through the at least one fastener opening of the body.

5. The calcaneal prosthesis system of claim 4 , wherein the IM nail has a first portion with a first diameter and a second portion with a second diameter different from the first diameter, and the surface defining the hole in the body has a first part sized to receive the first portion and a second part sized to receive the second portion.

6. The calcaneal prosthesis system of claim 1 , wherein the dorsal surface has a trapezoidal shape.

7. The calcaneal prosthesis system of claim 1 , wherein the tuberosity extends in an oblique direction relative to an anterior-posterior direction of the body.

8. The calcaneal prosthesis system of claim 1 , wherein the body is patient specific.

9. The calcaneal prosthesis system of claim 8 , wherein the dorsal surface of the body is porous.

10. The calcaneal prosthesis system of claim 8 , wherein the anterior surface of the body is porous.

11. The calcaneal prosthesis system of claim 1 , wherein the body comprises a material having a first density, the body further including one or more struts having a second density greater than the first density.

12. The calcaneal prosthesis system of claim 1 , wherein the surface defining the hole limits a depth of insertion of the IM nail.

13. The calcaneal prosthesis of claim 1 , wherein the IM nail has at least one aperture at an end of the IM nail opposite from the body.

14. The calcaneal prosthesis of claim 13 , wherein the at least one aperture is to configured to receive a fastener oriented at an oblique angle relative to a longitudinal axis of the IM nail.

15. A method of making the calcaneal prosthesis system of claim 1 , the method comprising:

collecting image data defining a first three-dimensional (3D) model of a first calcaneus of a patient;

forming a second 3D model of a second calcaneus by computing a mirror image of the first 3D model about a sagittal plane; and

fabricating the body of the calcaneal prosthesis according to the second 3D model, using an additive manufacturing process.

16. The method of making a calcaneal prosthesis according to claim 15 , further comprising

adding to the second 3D model at least one surface defining a first hole that extends through the second calcaneus, the first hole sized and shaped to receive an intramedullary nail; and

adding at least one fastener hole or guide wire hole to the 3D model, such that the first hole and the fastener hole do not intersect each other.