Patent ID: 8328873

Claim:
A prosthesis system for replacing a knee joint between a femur and a tibia, the prosthesis system comprising: a femoral component including a first condylar portion, a second condylar portion, a first sidewall extending superiorly from the first condylar portion, and a second sidewall extending superiorly from the second condylar portion; a tibial component having a post, 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; a first yoke having an inferior portion, a superior portion and a yoke keyway extending through the first yoke; and a first key that is removably inserted into the yoke keyway, the first key locking the first yoke relative to the bearing in an assembled position; wherein the bearing has a bearing keyway and wherein the first key extends through at least portions of the yoke keyway and the bearing keyway to lock the first yoke and the bearing relative to the post in the assembled position.