The volar plate of the index finger MCP joint is the fibrocartilaginous palmar plate attached to the index proximal phalanx base, resisting MCP joint hyperextension and providing the palmar joint floor.
Resists MCP hyperextension, contributes to MCP joint stability through its checkrein ligament attachments to the metacarpal neck, and provides the palmar floor of the index MCP joint.
Index MCP volar plate injury from forced hyperextension produces MCP joint dorsal subluxation or dislocation. Complex MCP dislocations with volar plate entrapment require open reduction — the volar plate blocks closed reduction by interposing in the joint.
Index MCP dorsal dislocation with the volar plate interposed in the joint preventing closed reduction — managed by volar or dorsal open approach to extract the entrapped volar plate.
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