Humeral shaft fractures secondary to hand grenade throwing.

A series of five cases were presented in which similar fractures of the shaft of the humerus occurred during the hand grenade throwing activity during the military education. All the fractures were in the 1/3 distal humeral shaft, and butterfly fragments were accompanying in two soldiers. All the fractures healed without any clinical complications with conservative treatment. The mechanism of the fracture is discussed with reference to the recent literature.