| 摘要 |
PCT No. PCT/EP96/03685 Sec. 371 Date Feb. 24, 1998 Sec. 102(e) Date Feb. 24, 1998 PCT Filed Aug. 21, 1996 PCT Pub. No. WO97/07754 PCT Pub. Date Mar. 6, 1997In an endoprosthesis including a ball-and-socket joint, the ball and a socket insert having a spherical surface are made of ceramic material. The opening edge of the socket is covered by a polyethylene protecting ring whose opening side is covered by a covering ring made of a resilient material. The inner edge of the protecting ring is appropriately covered by the protecting. The socket, the ceramic insert, the protective ring and the covering ring are configured so as to permit sliding of a ball seated in the socket and configured to conform to the spherical surface of said ceramic insert out of the endoprosthesis.
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