A prosthetic joint includes: (a) a first member comprising rigid material including a wear-resistant, concave cup surface; and (b) a second member comprising rigid material with a wear-resistant, convex contact surface; (c) one of the surfaces includes: (i) an annular first flange defining a protruding...http://www.google.ca/patents/US20100262250?utm_source=gb-gplus-sharePatent US20100262250 - PROSTHETIC BALL-AND-SOCKET JOINT
