A patella prosthesis is a mushroom shaped member whose head (1) is symmetrical or contoured to correspond to a human patella. The stem (2) is for insertion in a drilling in the resectioned surface which is shaped to receive the inferior surface (4) of the head (1). The preferred material is polyethylene...http://www.google.es/patents/US5609640?utm_source=gb-gplus-sharePatente US5609640 - Patella prostheses
