Dorsal dislocation of the metacarpophalangeal joint of the index finger treated by late open reduction. A case report.

Dorsal dislocation of the metacarpophalangeal joint of the index finger has previously been reported by several authors. Kaplan first described the pathological anatomy accurately in I 957: the metacarpal head ruptures through the volar fibrocartilaginous plate and the plate comes to lie behind the metacarpal head, between it and the base of the proximal phalanx. The flexor tendons of the index finger lie ulnar to the head, while the lumbrical muscles lie radial to the head and the super-

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