Prosthetic patello femoral joint assembly.

摘要

A prosthetic patello femoral joint assembly comprising a patella femoral joint assembly comprising a patella mounting component (1) on which is located a movable mobile element bearing component (10) a first side (11) of which is shaped to engage the patella groove of a natural or an artificial femoral component (14), and a second side (15) of which has a substantially spherical concave bearing surface (16) which engages and can articulate against a substantially spherical posterior convex bearing surface (6) on said mounting component, and control means such as a peg (7) with extensions (9) engaging an undercut (18) of a slot (17) acting between the components which restrict substantially vertical movement of the bearing component relative to the mounting component about a medio lateral axis of the knee with which it is to be used but allow substantially medio lateral movement and relative rotation between said mounting component and said bearing component. <IMAGE>