Patent ID: 8721730

Claim:
In a total knee-replacement system including a tibial component having medial and lateral bearing surfaces and a superior post with a posterior surface, and a distal femoral component having medial and lateral condylar protrusions that articulate with the medial and lateral bearing surfaces and an intercondylar region with a central earn that engages with the posterior surface of the superior post, the improvement comprising: a distal femoral component having central cam with a convex outer cam action surface area in the intercondylar region that engages the posterior surface of a tibial post before 90 degrees of flexion; and a cam extension providing a separate cam action surface area that makes initial contact with the posterior surface of the post after 90 degrees of flexion to facilitate enhanced knee flexion without dislocation over the tibial post; and wherein the separate cam action surface area of the cam extension faces proximally away from a tibial articulating surface when a knee is in extension.