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US 12,109,119 B2Granted
Orthopaedic femoral component having controlled condylar curvature
AssigneeDepuy Ireland Unlimited Company
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 single condyle having a condyle surface curved in the sagittal plane;
- and
- a tibial bearing having an upper surface having a single bearing surface configured to articulate with the condyle surface of the single condyle of the femoral component,
- wherein the condyle surface (i) contacts the single bearing surface at a first contact point on the condyle surface at a first degree of flexion degrees, (ii) contacts the single bearing surface at a second contact point on the condyle surface at a second degree of flexion greater than the first degree of flexion and less than about 30 degrees, and (iii) contacts the single bearing surface at a third contact point on the condyle surface greater than the second degree of flexion and less than about 75 degrees of flexion,
- wherein (i) the condyle surface in the sagittal plane has a first radius of curvature at the first contact point, a second radius of curvature at the second contact point, and a third radius of curvature at the third contact point and (ii) a curved surface section defined between the second contact point and the third contact point that is defined by a plurality of radii having different lengths such that the curved surface section has a non-constant radius of curvature.
2 more elements
An orthopaedic knee prosthesis comprising:
- a uni-compartmental femoral component having a single condyle having a condyle surface curved in the sagittal plane;
- and a uni-compartmental tibial bearing having an upper surface having a single bearing surface configured to articulate with the condyle surface of the single condyle of the uni-compartmental femoral component,
- wherein the condyle surface (i) contacts the single bearing surface at a first contact point on the condyle surface at a first degree of flexion degrees, (ii) contacts the single bearing surface at a second contact point on the condyle surface at a second degree of flexion greater than the first degree of flexion, and (iii) contacts the single bearing surface at a third contact point on the condyle surface greater than the second degree of flexion and less than about 110 degrees of flexion,
- wherein (i) the condyle surface in the sagittal plane has a first radius of curvature at the first contact point, a second radius of curvature at the second contact point, and a third radius of curvature at the third contact point and (ii) a curved surface section defined between the second contact point and the third contact point is defined by a plurality of radii having different lengths such that the curved surface section has a non-constant radius of curvature.
1 more element
Dependencies are inferred from the claim text.