Interphalangeal (IP) joint dislocations of the fingers are common. Typically associated with forced hyperextension or hhyperflexion of the fingers, they require immediate reduction. The IP joint is a hinge joint that allows only flexion and extension and consists of several ligamentous complexes. The treatment is basically: after a successful reduction in the ER, splint, ice and elevation of the affected finger. After reduction, the affected joint most be assessed for flexor-extensor tendon function, active range of motion, localized tenderness, and instability in the medial-lateral and dorsal-volar directions. The joint is usually immobilized with a foam-padded splint immediately after reduction to prevent redislocation or instability. The Immobilization is kept for 14-21 days for a Proximal IP joint dislocation and 10-14 days for a Distal IP joint dislocation. Buddy taping (taped on the next finger) for 3-6 weeks thereafter allows active range of motion and prevents hyperextension.
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