Patent ID: 8382845
Filing Date: 2013-02-26
Classification: A61F

Abstract:
1. A knee joint prosthesis comprising: a tibial component having a distal side for attachment to a tibia, the tibial component comprising: a tibial base having a proximal side and a distal side; and a tibial bearing having a proximal side and a distal side, the distal side coupled to the proximal side of the tibial base, the proximal side of the tibial bearing comprising a bearing surface having lateral and medial bearing surfaces and a groove between the lateral and medial bearing surfaces, the groove having a surface located more distally all along its length than adjacent portions of the tibial bearing; and a femoral component having a proximal side for attachment to a femur and a distal side articulating with the tibial bearing, the femoral component comprising: an anterior portion; lateral and medial condylar portions extending from the anterior portion for articulating with the lateral and medial bearing surfaces of the tibial bearing; and a central condylar portion extending anteriorly and superiorly beyond respective posterior ends of the lateral and medial condylar portions, the central condylar portion having a convex outer surface and a radius of curvature that is concentric with the radii of curvature of the medial and lateral condylar portions such that the medial, lateral and central condylar portions rotate about a common axis in flexion, the central condylar portion articulating with the groove in flexion.