CALCANEAL PROSTHESIS AND METHOD OF FORMING THE SAME
A calcaneal prosthesis system includes a body having a dorsal surface, a plantar surface, an anterior surface, and a posterior end. The posterior end has a tuberosity. The anterior surface has at least a concavity or convexity shaped for receiving a cuboid bone or mid-foot bone. The dorsal surface includes a convex or concave surface for engaging a talus bone or distal tibia. An integrally formed intramedullary (IM) nail extends from the dorsal surface.
1 . A calcaneal prosthesis, comprising:
a single-piece body having a dorsal surface, an anterior surface, and a posterior end,
the posterior end having a tuberosity,
the anterior surface having a concavity shaped for receiving a cuboid bone or mid-foot bone,
the dorsal surface including a convex surface for engaging a talus bone or distal tibia,
the single-piece body having an integral intramedullary (IM) nail protruding from the dorsal surface.
2 . 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.
3 . The calcaneal prosthesis of claim 2 , 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.
4 . The calcaneal prosthesis of claim 1 , wherein the convex surface has a trapezoidal shape.
5 . The calcaneal prosthesis of claim 1 , wherein the tuberosity extends in an oblique direction relative to an anterior-posterior direction of the body.
6 . The calcaneal prosthesis of claim 1 , wherein the calcaneal prosthesis is manufactured via an additive manufacturing technique.
7 . A prosthesis, comprising:
a body including a dorsal surface, a planar surface, a medial surface, a lateral surface, an anterior surface, an a posterior end having a tuberosity that approximates a shape of a calcaneal tuberosity; and
an intramedullary nail extending from the dorsal surface of the body,
wherein the intramedullary nail is integrally formed with the body.
8 . The prosthesis of claim 7 , wherein the tuberosity extends in an oblique direction relative to an anterior-posterior direction of the body.
9 . The prosthesis of claim 7 , wherein the anterior surface includes a trapezoid-shaped projection.
10 . The prosthesis of claim 7 , wherein the anterior surface defines a trapezoid-shaped recess.
11 . The prosthesis of claim 7 , wherein the dorsal surface includes a convex surface, and wherein the intramedullary nail extends from the convex surface.
12 . The prosthesis of claim 11 , wherein the convex surface has a trapezoidal shape.
13 . The prosthesis of claim 12 , wherein the body defines an opening sized and configured to receive a fixation device.
14 . The prosthesis of claim 13 , wherein the intramedullary nail defines at least one aperture sized and configured to receive a fastener.
15 . The prosthesis of claim 12 , wherein the intramedullary nail defines at least one aperture sized and configured to receive a fastener.
16 . The prosthesis of claim 7 , wherein the intramedullary nail has an elongated shape having a constant diameter along its length.
17 . The prosthesis of claim 7 , wherein the intramedullary nail includes a stop along its length.
18 . A method, comprising:
collecting image data defining a first three-dimensional model of a first calcaneus of a patient;
forming a second three-dimensional model of a second calcaneus by computing a mirror image of the first three-dimensional model about a sagittal plane; and
fabricating a calcaneal prosthesis having a body and an intramedullary nail according to the second three-dimensional model,
wherein the intramedullary nail is integrally formed with the body.
19 . The method of claim 18 , wherein the calcaneal prosthesis is formed using an additive manufacturing process.
20 . The method of claim 18 , further comprising adding at least one hole to the second three-dimensional model, the at least one hole sized and configured to a fixation device.