Patent ID: 8163028

Claim:
A prosthesis for replacing a knee joint between a femur and a tibia, the prosthesis comprising: a femoral component including a first condylar portion, a second condylar portion, a first sidewall extending superiorly from the first condylar portion, a second sidewall extending superiorly from the second condylar portion, the first and second sidewalls collectively comprising a first hinge portion; a tibial component having a bone engaging inferior surface and a bearing engaging superior surface; a bearing having an articulating inferior surface adapted to articulate along the bearing engaging surface and a superior femoral engaging surface, the bearing having a keyway that defines an opening; and a yoke having an inferior portion and a superior portion, the superior portion comprising a second hinge portion that hingedly couples to the first hinge portion, the second hinge portion including an axle defining a hinge axis and having an axle post that is movable along the hinge axis between an installation position and an assembled position, the inferior portion configured to at least partially pass through the opening; wherein the tibial component has a first engagement portion formed thereon including at least one superiorly extending finger having a catch surface that generally opposes the bearing engaging superior surface and wherein the inferior portion of the yoke has a second engagement portion formed thereon including at least one tang having a superior surface that generally opposes the catch surface, wherein the keyway accommodates the at least one tang upon passage of the yoke through the opening of the bearing.