Patent ID: 7491235

Claim:
A unicompartmental knee prosthesis for implantation into a knee joint compartment between a femoral condyle and its corresponding tibial plateau, the prosthesis comprising: a body having a generally elliptical shape in plan, the body including opposed top and bottom surfaces and having a material thickness at a part center (CSO) thereof, the prosthesis free of any means of fixation to the knee joint and configured to be translatable within the knee joint compartment, the body including a supporting portion and a coating portion, the coating portion including a top layer attached to an upper surface of the supporting portion and a bottom layer attached to a lower surface of the supporting portion, wherein the top layer is on average of greater thickness than the bottom layer, the supporting portion having at least one surface at least partially disposed within an interior of the body and the coating portion having at least one surface disposed on an exterior of the body, wherein the supporting portion is constructed from a higher modulus material than the coating portion such that the body is at least slightly deformable.