Extra-articular avulsion fracture of the distal phalanx of the ring finger--a case report.

This report describes a rare case of extra-articular avulsion fracture of the flexor digitorum profundus tendon in a 59-year-old man is reported. A large avulsed fragment of bone was localized by radiography on the volar side of the middle phalanx. The avulsed bone fragment had torn the A4 pulley and had been caught by the C2 pulley. The fracture was extra-articular. The avulsed fragment was fixed using a fragment fixation screw. This case was classified as a subtype of type 3 according to Leddy's classification. Only 10 cases of type 3 injury have been reported, and none of them clearly involved an extra-articular fracture.