Patent ID: 9452053
Filing Date: 2016-09-27
CPC Classification: A61F

Claim Text:
1. 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 through a range of degrees of flexion, 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 in a range of 0 degrees to 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 in a range of 30 degrees to 70 degrees, (iii) contacts the bearing surface at a third contact point on the condyle surface at a third degree of flexion, the third degree of flexion in a range of 70 to 110 degrees, and (iv) contacts the bearing surface at a fourth contact point on the condyle surface at a fourth degree of flexion, the fourth degree of flexion being greater than the third degree of flexion, wherein (i) the condyle surface in the sagittal plane includes a first curved surface section that has a first radius of curvature at the first contact point, (ii) the condyle surface in the sagittal plane includes a second curved surface section that has a second radius of curvature at the second contact point that is different from the first radius of curvature, and (iii) the ratio of the first radius of curvature to the second radius of curvature is in the range of 1.10 to 1.45, wherein the condyle surface in the sagittal plane includes a third surface section that has a third radius of curvature at the third contact point that is different from the first radius of curvature and the second radius of curvature, the ratio of the first radius of curvature to the third radius of curvature is in the range of 1.10 to 1.45, and wherein the condyle surface in the sagittal plane includes a fourth surface section that has a fourth radius of curvature at the fourth contact point that is different from the first radius of curvature, the second radius of curvature, and the third radius of curvature, the ratio of the first radius of curvature to the fourth radius of curvature is in the range of 1.10 to 1.45.