Patent ID: 8523950

Claim:
A hinged knee prosthesis, comprising: a. a tibial component configured to attach to a tibia, the tibial component having a bearing surface with a posterior portion, the posterior portion including medial and lateral posterior portions each having a contour that slopes medially in a posterior direction, the tibial component having a superior-inferior axis; and b. a femoral component configured to hingedly attach to the tibial component and axially rotate relative to the tibial component about the superior-inferior axis, the femoral component comprising: i. a medial condyle; and ii. a lateral condyle, the medial and lateral condyles having a sagittal curvature surface configured to contact the bearing surface and induce axial rotation of the femoral component relative to the bearing surface of the tibial component when the medial and lateral condyles are in contact with the posterior portion of the tibial component and the femoral component is moving in a posterior direction relative to the tibial component.