Replacement hip or shoulder joint comprises ball and socket, diameter of socket opening being less than that of ball and its periphery being rigid, and ball having flat central band of smaller diameter

摘要

The replacement hip or shoulder joint comprises a ball (8) and socket (12). The diameter of the opening of the socket is less than that of the ball and its periphery (14) is rigid. The ball has a flat band (10) around its equator which is smaller in diameter than the ball and allows it to be introduced into the socket.