Knee joint prosthesis
First Claim
1. A knee joint prosthesis comprisinga femur part having at least one condyle with a first bearing surface including a double convex curve in an anterior/posterior direction formed from at least two circular sectors having different radii of curvature and center points;
- a tibia part having a plastic part with a second bearing surface receiving said at least one femur condyle thereon; and
a plurality of support members in said plastic part of a harder material than said plastic part, each said support member having a support surface lying in said bearing surface of said plastic part and including double concave curves, wherein each support surface has two different concave curves with radii of curvature correspondign to said radii of said convex anterior/posterior curves of said at least one femur condyle.
1 Assignment
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Accused Products
Abstract
The knee joint prosthesis is formed of a tibia metal plate which can be attached to a tibia and a femur part which can be secured in a femur. An intermediate plastic part is provided on the tibia metal plate to receive the femur part in bearing relation. In order to reduce abrasion of the intermediate plastic part, support members of hard material are distributed in the bearing surface of the intermediate plastic part to receive the femur part thereon. The bearing surfaces of the support members are integrated in the bearing surface of the intermediate part and are provided with dual surfaces to receive different bearing surfaces of the femur part, each of which has a different radius of curvature.
403 Citations
10 Claims
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1. A knee joint prosthesis comprising
a femur part having at least one condyle with a first bearing surface including a double convex curve in an anterior/posterior direction formed from at least two circular sectors having different radii of curvature and center points; -
a tibia part having a plastic part with a second bearing surface receiving said at least one femur condyle thereon; and a plurality of support members in said plastic part of a harder material than said plastic part, each said support member having a support surface lying in said bearing surface of said plastic part and including double concave curves, wherein each support surface has two different concave curves with radii of curvature correspondign to said radii of said convex anterior/posterior curves of said at least one femur condyle. - View Dependent Claims (2, 3)
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4. A knee join prosthesis comprising
a metal femur part having at least one condyle having a first bearing surface with a first section on a first radius of curvature and a second section in an anterior/posterior direction on a second radius of curvature; -
a tibia part having a plastic part with a secondary bearing surface receiving said bearing surface of said at least on condyle thereon; and a plurality of metal support members in said plastic part, each support member having a third bearing surface lying in said second bearing surface of said plastic part with a first concave surface complementary to said first radius of curvature and a second concave surface complementary to said second radius of curvature. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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Specification