Title: Bicondylar joint prosthesis

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Abstract: A bicondylar joint prosthesis for articulating two portions of a natural or artificial limb including two pairs of co-acting male and female condylar components of artificial material, the male components consisting of male medial and lateral protruberances having substantially identical part-spherical articulating surfaces engageable with a respective complementary female medial and lateral condylar component, the lateral pair of condylar components being shaped to allow relative angular deflection of the two limb portions simultaneously about two axes, a first axis of the two axes lying in a medial-lateral plane of the prosthesis passing through a common mean center of relative rotation of the lateral components and a second axis of the two axes also passing through the common mean center and being substantially normal to the first axis while the medial condylar components are shaped to roll on each other about both axes, the rolling motion about the second axis producing angular deflection of the first axis in a plane substantially normal to the general axes of the limb in extension, the medial male condylar protruberance having a curvature about the first hinge axis, the co-acting female medial condylar component being constituted by a groove having a radius of curvature about the second axis, and the bottom of the groove being substantially flat or having a radius of curvature about the first hinge axis which tends to infinity and is greater than the radius of curvature about the first hinge axis of the male condylar protruberance.


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