| 摘要 |
A hip endoprosthesis for mounting in a distally tapering recess that opens at the proximal end of a femur has a nonmetallic sheath imbedded in the recess so as to be generally integral with the femur and having an inner surface with a distally tapering proximal portion and a uniform-section distal portion. A ball shaped to fit into an acetabulum is carried on a neck in turn formed unitarily of metal with the ball with a stem engaged in the sheath and having an outer surface with a proximal portion complementary to and tightly fitted in the proximal surface portion of the sheath surface and a distal portion slidable in the distal surface portion of the sheath surface. Thus relative motion of the proximal surface portions is impossible but relative sliding motion of the distal surface portions is possible. The main load is transmitted directly to the head of the femur, where it is normally applied, and the transverse load is transmitted through the sliding joint to a more distal portion of the femur, where this type of load is also normally received.
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