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An irreducible juxta-epiphyseal fracture of the proximal phalanx. Report of a case.

The causes of irreducibility of juxta-epiphyseal fractures of the proximal phalanx are illustrated in a patient with button hole rent in the periosteum and extensor hood mechanism causing trapping of the distal fragment. The entrapment, in the manner of a Chinese finger trap, was aggravted by traction on the digit. Open reduction was necessary to reduce the fracture.