Injury to the deep branch of the ulnar nerve in association with dislocated fractures of metacarpals II-IV.

The deep branch of the ulnar nerve may be injured at the same time as fracture dislocations of the fifth metacarpal. We describe injuries to that nerve in two patients with dislocated fractures of the second or third and fourth metacarpals. The fractures were treated by open reduction and fixation with plates and screws, and it is possible that the repositioning and fixing caused the injury.