Patent ID: 8906105

Claim:
A knee replacement system comprising: a tibial baseplate comprising a tibia facing surface and a superior surface, wherein the tibia facing surface is shaped to lie against a tibial resected surface; a femoral knee implant comprising a pair of condyles, a cam feature, and a bone facing side shaped to lie against a resected surface of a femur; a tibial insert comprising a baseplate facing side, a lateral articulating surface, and a medial articulating surface, wherein the baseplate facing side pivotally articulates with the superior surface, wherein the baseplate facing side defines a boss toward a medial side to provide a medially-displaced axis of rotation upon insertion of said boss into a cavity positioned medially on the superior surface, wherein the articulating surfaces are shaped and positioned to articulate with the condyles, and a channel passes through the tibial insert along a direction generally perpendicular to the baseplate facing side, wherein the channel is arc shaped to guide a rotation of the tibial insert posteriorly relative to the tibial baseplate about the medially-displaced axis of rotation; and a cam post coupled to the tibial baseplate and protruding from the superior surface and passing through the channel, wherein contact of an anterior side of the cam feature with a posterior side of the cam post during flexion of a knee joint in which the knee replacement system is implanted provides the rotation, and wherein the cam post further interacts with the channel to provide anterior and posterior stops for the rotation.