injuries poisoning
Mallet Finger
Introduction
Mallet finger is a flexion deformity of the fingertip caused by avulsion of the extensor tendon, with or without fracture, from the proximal end of the distal phalanx. (See also Overview of Sprains and Other Soft-Tissue Injuries .) The usual mechanism is forced flexion of the distal phalanx, typically when hit with a ball. The extensor tendon may avulse part of the proximal aspect of the distal phalangeal bone (see figure). The avulsed part involves the articular surface. The extensor tendon is avulsed from the proximal end of the distal phalanx (top); sometimes the tendon avulses a piece of the distal phalangeal bone (bottom). 