Seven cases of fractures of the humerus from arm wrestling included 2 types of fractures. Two were spiral fractures of the humeral shaft with large butterfly fragments at the junction of the middle and distal one third caused by a violent uncoordinated muscular action. Five were fractures of the medial epicondyle of the humerus as a result of a sudden blow to the elbow. In all 7 cases, the fractures healed and arm function returned to normal.
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Moon et al. (1980) studied this question.
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