Patent ID: 8273132
Filing Date: 2012-09-25
Classification: A61F

Abstract:
1. 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 bearing surfaces and an intercondylar region with a central cam that engages with the posterior surface of the superior post, the improvement comprising: a distal femoral component having a central cam with a first, convex cam action surface in the intercondylar region that engages the posterior aspect of a tibial post before 90 degrees of flexion; a cam extension that terminates in a second cam action surface that makes initial contact with the posterior aspect of the post after 90 degrees of flexion to facilitate enhanced knee flexion without dislocation over the tibial post; and an intermediate surface portion between the first and second cam action surfaces that does not make contact with the tibial post.