Bicondylar joint prosthesis

Details Bicondylar joint prosthesis Bicondylar joint prosthesis

A - Human Necessities

61

F

3/101

A61F 2/38 (2006.01)

Patent

CA 1109603

ABSTRACT OF THE DISCLOSURE A bicondylar joint prosthesis for articulating two portions of a natural or artificial human limb. It comprises two pairs of coacting male and female condylar components of artificial material. The male components consist of medial and lateral protuberances each engageable with a respective complementary female medial or lateral condylar component. The lateral pair of condylar components are shaped to allow relative angular deflection of the two limb portions simultaneously about two axes. The first or hinge axis passes in the medial-lateral direction through the common mean centre of relative rotation of the lateral condylar components and the second axis also passes through the said centre and lies in a plane substantially normal to the first or hinge axis. The medial condylar components are shaped to roll on each other about both axes. The rolling motion about the second axis pro- duces angular deflection of the first or hinge axis in a plane sub- stantially normal to the general axis of the limb in extension. The medial male condylar protruberance has a curvature about the mean hinge axis. The co-acting female medial condylar component is constituted by a groove having a radius of curvature about the second axis. The bottom of the groove is substantially flat or has a radius of curvature about the mean hinge axis which tends to infinity and is greater than the radius of curvature about the mean hinge axis of the male condylar protruberance.

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