| 摘要 |
An artificial hip joint comprising a socket member and an inter-fitting ball member, in which dislocation of the joint is positively prevented by retaining means forming part of the socket member. The retaining means are constituted by extensions of the socket member beyond its diametral plane which define an opening into the socket smaller than that of the socket at the diametral plane. The ball member is shaped to pass through the socket opening at one particular orientation, for fitting the parts together, but once in place and orientated in normal positions of use the ball member cannot be removed from the socket.
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