Complete rupture of the triceps brachii muscle.

Avulsion of the triceps tendon is an uncommon injury, but intramuscular rupture of the triceps brachii muscle is extremely rare. Anzel et al reviewed a series of 1014 cases of muscle and tendon injuries and found that only eight of these involved the triceps; four of the eight resulted from open lacerations. An extensive review of the literature showed only six previously reported cases of intramuscular rupture of the triceps.