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Thumb MCP Joint Dislocations

The MCP joint is capable of a large degree of motion. The supporting structures of the thumb-MCP joint are uniquely developed. Dorsal (backwards) dislocation of the thumb MCP joint is a similar clinical entity
to dislocation of the MCP joints of the fingers, with volar plate disruption and possible entrapment of the metacarpal head by the buttonholed tissue. Closed reduction by gentle manipulation is possible more often than in similar injuries to the finger joints, though surgical open reduction is still sometimes necessary. If closed reduction of the dislocation is possible and the collateral ligaments are stable, then 4 weeks of immobilization to block the thumb from straightening and to allow active bending should be adequate.

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