| 摘要 |
An endoprosthetic joint used to replace a dysfunctional thumb carpometacarpal joint comprises a first, or metacarpal, component adapted for insertion into the first metacarpal of the thumb and carrying thereon the ball portion of a ball-and-socket joint. In one embodiment, said joint further comprises a second or base portion of slightly flexible material defining a socket into which said ball is snappably received and having a projection thereon for reception into a suitably prepared recess in the trapezium bone of the hand. Both said components are cemented into place for firm holding therein. In a second embodiment, the metacarpal portion is identical with, and the base portion is generally similar to, that of the first embodiment. However, since with this embodiment the trapezium bone is removed, the base portion of said prosthesis is elongated whereby it may be received into a suitable recess in the navicular bone of the hand while still locating its socket adjacent the base of the first thumb metacarpal. The metacarpal portion of the joint in this embodiment is received into a suitably drilled hole in the first metacarpal of the thumb and the ball of said metacarpal component is snappably received into said socket in the same manner as in the above-discussed embodiment.
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