Patent ID: 8784496

Claim:
An orthopaedic knee prosthesis comprising: a femoral component having a condyle surface curved in the sagittal plane; and a tibial bearing having a bearing surface configured to articulate with the condyle surface of the femoral component, wherein the condyle surface (i) contacts the bearing surface at a first contact point on the condyle surface at a first degree of flexion, the first degree of flexion being less than about 30 degrees, (ii) contacts the bearing surface at a second contact point on the condyle surface at a second degree of flexion, the second degree of flexion being in the range of 45 degrees to 90 degrees, and (iii) contacts the bearing surface at a third contact point on the condyle surface at a third degree of flexion greater than the second degree of flexion, wherein (i) the condyle surface in the sagittal plane has a first radius of curvature at the first contact point, (ii) the condyle surface in the sagittal plane has a second radius of curvature at the second contact point, (iii) the condyle surface in the sagittal plane has a third radius of curvature at the third contact point, (iv) the ratio of the first radius of curvature to the second radius of curvature is in the range of 1.10 to 1.45, and (v) the third radius of curvature being greater than the second radius of curvature by at least 0.5 millimeters, wherein the condyle surface in the sagittal plane includes a first curved surface section defined between the first contact point and the second contact point, the first curved surface section having a non-constant radius of curvature.