Patent ID: 8480751

Claim:
A prosthesis system for replacing a knee joint between a femur and a tibia, the prosthesis comprising: a first femoral component including a first condylar portion, a second condylar portion, a first sidewall extending superiorly from the first condylar portion, a second sidewall offset from the first sidewall a first distance and extending superiorly from the second condylar portion; a tibial component having a bone engaging inferior surface and a bearing engaging superior surface; a bearing having an inferior surface that engages the bearing engaging surface and a superior femoral engaging surface, the bearing defining an opening and a bearing keyway; a first yoke and a second yoke each having an inferior portion, a superior portion and a yoke keyway extending therethrough, the superior portion of the first yoke having an axle assembly that expands along its axis, the superior portion of the second yoke cooperating with a solid axle that spans a second distance greater than the first distance; a first key that is removably inserted into the first yoke keyway and the bearing keyway and interfaces with the axle assembly; and a second key that is removably inserted into the second yoke keyway and the bearing keyway and interfaces with the solid axle; wherein the first or second yoke is selectively and alternatively connected between the first femoral component and the bearing in an assembled position; wherein the axle assembly includes a pair of axle posts that expand outward towards the first and the second sidewalls of the first femoral component upon advancement of the first key into the yoke keyway.