The ulnar collateral ligament of the ring finger MCP joint resists radial deviation at the ring MCP level, completing the four-ligament constraint system of the ring metacarpophalangeal joint.
Provides ulnar-side constraint to the ring MCP joint, balances the radial collateral ligament, and is the ligament at risk in ring finger MCP dislocations.
Ring MCP dislocation (complex irreducible type) requires open reduction when the volar plate or collateral ligaments interpose in the joint. The ring finger UCL is assessed as part of MCP joint reconstruction following dislocation.
Complex ring MCP dislocation with soft tissue interposition requiring open reduction, with collateral ligament repair if instability persists after anatomic reduction.
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