Avulsion fracture of the origin of the brachioradialis muscle.

Avulsion fracture of the brachioradialis muscle from its origin on the lateral supracondylar ridge of the humerus has not previously been reported in the literature. In this article, we present the case of a patient who sustained a grade I open avulsion fracture of the lateral supracondylar ridge of the humerus. The mechanism by which this fracture occurred is proposed on the basis of the structure and function of the brachioradialis muscle.