Ankle prosthesis
First Claim
1. A fixed-bearing ankle prosthesis, comprising:
- a tibial component for attachment to a tibia, wherein the tibial component has first and second surfaces; and
a talar component for attachment to a talus, wherein the talar component has first and second surfaces and medial and lateral edges;
wherein;
at least a portion of the first surface of the tibial component is configured to be disposed adjacent the tibia;
at least a portion of the first surface of the talar component is configured to be disposed adjacent the talus;
at least a portion of the second surface of the tibial component and at least a portion of the second surface of the talar component contact one another directly to form an articulation interface between the tibial component and the talar component;
the articulation interface includes a bicondylar geometry such that the second surface of the tibial component defines a medial condylar facet and a lateral condylar facet and the second surface of the talar component comprises a medial condyle and a lateral condyle;
the medial and lateral condylar facets of the tibial component have concave circular arc cross-sections extending in a medial-lateral plane;
the medial and condyle of the talar component has a first single radius in the medial-lateral plane that defines a convex circular arc cross-section continuously extending, in the medial-lateral plane, from the medial edge of the talar component to a concave central portion of the talar component second surface separating the medial and lateral condyles;
the lateral condyle of the talar component has a second single radius in the medial-lateral plane that defines a convex circular arc cross-section continuously extending, in the medial-lateral plane, from the lateral edge of the talar component to the concave central portion of the talar component second surface;
the concave circular arc cross-section of the medial condylar facet of the tibial component has a radius in the medial-lateral plane larger than the first radius; and
the concave circular arc cross-section of the lateral condylar facet of the tibial component has a radius in the medial-lateral plane larger than the second radius.
1 Assignment
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Accused Products
Abstract
A fixed-bearing ankle prosthesis may include tibial and talar components whose articulating surfaces directly contact one another. The tibial component defines medial and lateral concave condylar facets separated by a convex central portion. The talar component includes medial and lateral convex condyles separated by a concave central portion. The condyles each have a single radius of curvature in a medial-lateral plane such that each condyle has a circular-arc cross-section continuously extending from the respective medial or lateral edge of the talar component to the concave central portion. The medial-lateral radii of the condyles are smaller than corresponding radii of the condylar facets.
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Citations
11 Claims
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1. A fixed-bearing ankle prosthesis, comprising:
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a tibial component for attachment to a tibia, wherein the tibial component has first and second surfaces; and a talar component for attachment to a talus, wherein the talar component has first and second surfaces and medial and lateral edges; wherein; at least a portion of the first surface of the tibial component is configured to be disposed adjacent the tibia; at least a portion of the first surface of the talar component is configured to be disposed adjacent the talus; at least a portion of the second surface of the tibial component and at least a portion of the second surface of the talar component contact one another directly to form an articulation interface between the tibial component and the talar component; the articulation interface includes a bicondylar geometry such that the second surface of the tibial component defines a medial condylar facet and a lateral condylar facet and the second surface of the talar component comprises a medial condyle and a lateral condyle; the medial and lateral condylar facets of the tibial component have concave circular arc cross-sections extending in a medial-lateral plane; the medial and condyle of the talar component has a first single radius in the medial-lateral plane that defines a convex circular arc cross-section continuously extending, in the medial-lateral plane, from the medial edge of the talar component to a concave central portion of the talar component second surface separating the medial and lateral condyles; the lateral condyle of the talar component has a second single radius in the medial-lateral plane that defines a convex circular arc cross-section continuously extending, in the medial-lateral plane, from the lateral edge of the talar component to the concave central portion of the talar component second surface; the concave circular arc cross-section of the medial condylar facet of the tibial component has a radius in the medial-lateral plane larger than the first radius; and the concave circular arc cross-section of the lateral condylar facet of the tibial component has a radius in the medial-lateral plane larger than the second radius. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A fixed-bearing ankle prosthesis comprising a tibial component and a talar component, wherein:
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the tibial component comprises a tibial attachment surface and a tibial articulating surface; the talar component comprises a medial edge, a lateral edge, a talar attachment surface and a talar articulating surface, the talar articulating surface directly contacting the tibial articulating surface; the tibial articulating surface comprises a medial concave condylar facet and a lateral concave condylar facet, each condylar facet having a radius of curvature in a medial-lateral plane that defines a respective circle arc, the facets separated from one another by a convex central portion; the talar articulating surface comprises a medial convex condyle that underlies the medial condylar facet, and a lateral convex condyle that underlies the lateral condylar facet, the condyles separated from one another by a concave central portion that underlies the tibial convex central portion; the medial condyle of the talar component has a first single radius of curvature in the medial-lateral plane that defines a convex circular arc cross-section continuously extending, in the medial-lateral plane, from the medial edge of the talar component to the concave central portion of the talar articulating surface; the lateral condyle of the talar component has a second single radius of curvature in the medial-lateral plane that defines a convex circular arc cross-section continuously extending, in the medial-lateral plane, from the lateral edge of the talar component to the concave central portion of the talar component second surface; the medial condyle radius of curvature is smaller than the medial condylar facet radius of curvature; and the lateral condyle radius of curvature is smaller than the lateral condylar facet radius of curvature. - View Dependent Claims (9, 10, 11)
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Specification