Patent ID: 9220600
Filing Date: 2015-12-29
Classification: A61F

Abstract:
1. A knee prosthesis comprising: a femoral component having two C-shaped condyles, each condyle having first and second free ends with an opening defined therebetween, the opening being defined by side walls extending anteriorly from the first free ends of the condyles to the second free ends of the condyles, the side walls sloping anteriorly and downward from a first point where the side walls join the first free ends of the condyles to a second point where the side walls join the second free ends of the condyles, wherein the side walls are joined together by the condyles that in turn are connected by a cam extending between and joining the first free ends of the condyles, wherein the opening is bounded by the anteriorly sloping sidewalls and the cam, the femoral component further comprising a convexly-curved medial side and a convexly-curved lateral side opposite the medial side, the medial side and lateral side tapering inwardly toward one another as the medial side and lateral side extend toward the second free ends of the condyles, wherein the medial side is tapered inwardly at a first angle, and the lateral side is tapered inwardly at a second angle, the second angle being greater than the first angle; and a tibial component having two bearing surfaces, each bearing surface supporting a corresponding one of the condyles, and a post disposed between the bearing surfaces and extending away from the bearing surfaces and towards the femoral component, the tibial component comprising an anterior cut defining a first uniformly sloping incline that slopes posteriorly and upward toward a posterior end of the tibial component, and the post comprising an anterior edge defining a second uniformly sloping incline that slopes posteriorly and upward toward the posterior end of the tibial component, the first and second uniformly sloping inclines defining a clearance path for a patellar implant thereby eliminating patellar post conflict; the femoral component and tibial component engaging each other by constant contact with the second free ends of the condyles and the bearing surfaces, and by selective contact between the cam and post during at least a portion of flexion between the femoral and tibial components; wherein moving the femoral and tibial components in flexion moves a contact region defined between the cam and post inferiorly and medially, resulting in medial rotation between the tibial and femoral components.