Patent ID: 8425617

Claim:
A knee prosthesis comprising: (a) a femoral component configured to fit on a distal end of a femur, the femoral component comprising: (i) a lateral condylar structure and a medial condylar structure; and (ii) a posterior cam extending between the lateral condylar structure and the medial condylar structure, wherein the posterior cam has an asymmetrical shape such that a lateral side of the posterior cam is larger than a medial side of the posterior cam; and (b) a tibial articular component corresponding to a proximal end of a tibia and configured to cooperate with the femoral component, the tibial articular component comprising a lateral articulation surface for articulation with the lateral condylar structure of the femoral component, the lateral articulation surface comprising: (i) a lateral posterior articulation surface that includes a convex portion that slopes in a distal direction as it extends in a posterior direction to promote internal rotation of the tibia relative to the femoral component during flexion; and (ii) a lateral anterior articulation surface that does not slope in the distal direction as it extends in an anterior direction.