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US 9,539,099 B2Granted
Orthopaedic knee prosthesis having controlled condylar curvature
AssigneeDepuy Ireland Unlimited Company
InventorsMark A. Heldreth, Daniel D. Auger, Joseph G. Wyss, Danny W. Rumple, Jr., Christel M. Wagner, Dimitri Sokolov, Jordan S. Lee, John L. Williams, Said T. Gomaa, John M. Armacost
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Abstract
An orthopedic 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.
Claims23
An orthopaedic knee prosthesis comprising:
- a femoral component having a condyle surface curved in the sagittal plane, wherein the condyle surface is configured to contact a bearing surface of a tibial bearing at (i) a first contact point on the condyle surface at a first degree of flexion in a range of −10 degrees to 0 degrees, and (ii) a second contact point on the condyle surface at a second degree of flexion greater than 90 degrees,
- wherein the condyle surface in the sagittal plane between the first contact point and the second contact point is defined by at least five curved surface sections, and each curved surface section having a radius of curvature that extends from an origin point,
- wherein an arc is defined by the origin points of the radii of curvature, and the origin point of each curved surface section posterior to the anterior-most curved surface section is posterior to the origin point of an anteriorly-adjacent curved surface section.
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 less than about 30 degrees and (ii) contacts the bearing surface at a second contact point on the condyle surface at a second degree of flexion greater than about 45 degrees,
- wherein the condyle surface in the sagittal plane has a first radius of curvature at the first contact point, and a second radius curvature at the second contact point,
- wherein the condyle surface in the sagittal plane between the first contact point and the second contact point includes a plurality of curved surface sections, each curved surface section having a different radius of curvature that extends from an origin point, and the origin points of curved surface sections define a curved arc,
- wherein the plurality of curved surface sections include an anterior-most curved surface section, and the radius of curvature of the anterior-most curved surface section has a length greater than the radius of curvature of any other curved surface section of the plurality of curved surface sections.
3 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 in the range of 0 degrees to about 30 degrees and (ii) contacts the bearing surface at a second contact point on the condyle surface at a second degree of flexion greater than 90 degrees, and
- wherein (i) the condyle surface in the sagittal plane between the first contact point and the second contact point includes at least five curved surface sections, each curved surface section having a radius of curvature having a length different from any other curved surface section, and (ii) the at least five curved surface sections include an anterior-most curved surface section, the radius of curvature of the anterior-most curved surface section having a length greater than the radius of curvature of any other curved surface section.
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 less than about 30 degrees and (ii) contacts the bearing surface at a second contact point on the condyle surface at a second degree of flexion greater than about 45 degrees,
- wherein the condyle surface in the sagittal plane has a first radius of curvature at the first contact point, and a second radius curvature at the second contact point,
- wherein the condyle surface in the sagittal plane between the first contact point and the second contact point includes a plurality of curved surface sections, each curved surface section having a different radius of curvature that extends from an origin point, and the origin points of curved surface sections define a curved arc,
- wherein the condyle surface of the femoral component is a medial condyle surface, and the femoral component includes a lateral condyle surface that is asymmetrical with the medial condyle surface.
3 more elements
Dependencies are inferred from the claim text.