The ulnar collateral ligament of the finger DIP joint provides the ulnar constraint at the DIP articulation, resisting radial deviation forces at the distal finger level.
Maintains DIP alignment against radial deviation, contributes to the capsuloligamentous complex stability at the DIP joint, and is assessed in DIP joint reconstruction procedures.
Isolated DIP ulnar collateral ligament injuries occur in ball sports from radial deviation force (catching a ball on the tip). Chronic DIP instability from bilateral collateral laxity develops in rheumatoid disease, requiring DIP fusion for functional restoration.
Acute ulnar-sided DIP ligament sprain in ball sports producing pain on radial stress at the DIP joint, managed by digital splinting and progressive rehabilitation.
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