The dorsal DIP joint ligaments are the collateral reinforcements of the dorsal joint capsule at the distal interphalangeal joint, blending with the terminal extensor tendon insertion and the sagittal band system.
Reinforce the dorsal DIP joint capsule, resist hyperextension of the DIP joint, and contribute to the constraint of the terminal extensor tendon at the distal phalanx.
Dorsal DIP joint injury (mallet finger) disrupts the terminal extensor tendon at or near its dorsal DIP attachment. The dorsal ligament contribution to the avulsion fragment size determines whether bony or tendinous mallet repair is appropriate.
Disruption of the terminal extensor tendon and dorsal DIP capsular structures from forced DIP flexion producing a drop finger, managed by 6-8 weeks of DIP extension splinting for tendinous injuries or pin fixation for bony mallets.
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