Mallet finger also called drop or baseball finger is a deformity of the finger caused by detachment of the extensor mechanism from the base of the distal phalanx, either directly or in association with a fracture. The commonest cause of this injury is a violent flexion or laceration of the dorsum of the finger at the level of the distal inter-phalangeal joint. It is most commonly seen when the finger is struck on the tip resulting in rupture of the extensor tendon or avulsion of the tendon with or without a small fragment of bone from the insertion. If left untreated this lesion causes the distal phalanx to droop and leaves a mallet finger deformity.
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