The radial collateral ligament of the finger DIP joint runs from the head of the middle phalanx to the radial base of the distal phalanx, providing radial deviation constraint at the DIP joint.
Resists ulnar deviation forces at the DIP joint, maintains DIP joint alignment during lateral pinch, and contributes to the overall stability of the DIP articular complex.
DIP collateral ligament injuries are less common than PIP collateral injuries but produce DIP instability and pain on lateral stress. Chronic laxity contributes to DIP joint swan-neck deformity in patients with mallet fingers.
Radial ligament injury at the DIP joint producing radial-sided fingertip pain and mild DIP instability to ulnar stress, managed conservatively with buddy taping.
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