| 摘要 |
A hip prosthesis comprising a femoral stem (3), a spherical head (6) fitted over the neck (5) of the femoral stem, and a metal socket (1) with which the head is pivotably engageable. A cup (7) is inserted between the head (6) and the socket, the head and the cup are made of a ceramic or similar material having a low friction coefficient, and the head is pivotable on the cup. Said cup is pivotably fitted in a plastic socket (8) that is in turn fitted in the metal socket (1). Said prosthesis thus comprises two joints, one between the head (6) and the cup (7), and another between the cup (7) and the polyethylene socket (8), the first ceramic-ceramic joint being exposed to most stress. As a result, the wear of the polyethylene socket (8) produces very few loose particles, whereby the risk of separation is substantially reduced and the total lifetime of the prosthesis is greatly extended. The prosthesis has low wear properties.
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