Metacarpophalangeal dislocations.

Although MCP joint dislocations are much less common than PIP dislocations, they present a unique set of problems. MCP dislocations usually require open reduction. The obstructions to reduction include the volar plate, interposed ligaments, and the finger-trap effect of intrinsics and flexor tendons. The key to management of such injuries is proper identification of the dislocation type, use of open reduction where necessary, and an aggressive postinjury rehabilitation program. Complications of these injuries do occur, and they must be identified and managed properly.