Trigger finger: report of an unusual case.

Locking of a finger is a common condition usually caused by tightness of the fibrous sheaths around the flexor tendons. A case of a locking finger with an unusual traumatic cause and perioperative findings is presented. Different causes of trigger fingers, especially traumatic, reported in the literature are briefly discussed, and the importance of differing between traumatic and nontraumatic causes for locking phenomena is emphasized.