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US 2014/0350686 A1Published application
Orthopaedic femoral component having controlled condylar curvature
AssigneeDepuy (Ireland)
InventorsJohn L. Williams, Said T. Gomaa, John M. Armacost
Life of this patent
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Abstract
An orthopaedic knee prosthesis includes a femoral component having a condyle surface. The condyle surface is defined by one or more radii of curvatures, which are controlled to reduce or delay the onset of anterior translation of the femoral component relative to a tibial bearing.
Claims20
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 equal to about 0 degrees and (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 greater than the first degree of flexion,
- wherein (i) the condyle surface in the sagittal plane has a first radius of curvature at the first contact point and a second radius of curvature at the second contact point, and (ii) the second radius of curvature is greater than the first radius of curvature by at least 0.5 millimeters.
2 more elements
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 30 degrees, and (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 greater than about 30 degrees,
- 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, and (iii) the ratio of the first radius of curvature to the second radius of curvature is in the range of 0.80 to 0.99.
2 more elements
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 about 0 degrees, and (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 greater than about 50 degrees,
- wherein (i) the condyle surface in the sagittal plane includes a curved surface section extending from the first contact point to the second contact point, the curved surface section being defined by a substantially constant radius of curvature.
2 more elements
Dependencies are inferred from the claim text.