| 摘要 |
A metacarpophalangeal prosthesis includes a metacarpal component having a head portion and a phalangeal component having a socket portion. The head portion rotatably engages the socket portion member. The head portion is either circular or spherical, and the socket portion member is formed so as to cooperate rotatably with the head portion. In its preferred embodiment, a pair of shoulders are formed on the sides of a circular disk-like head portion and a pair of spaced apart surfaces are formed on the socket portion which contact the shoulders of the head portion when the phalangeal component is at maximum flexion. This contact constrains radial and ulnar deviation between maximum flexion and maximum extension such that at maximum flexion radial and ulnar deviation are constrained virtually altogether, while at the neutral position and at maximum extension, limited range of motion and limited radial and ulnar deviation is permitted.
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