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"Although no one has collected a sufficiently large series of cases of myositis ossificans—referred to as the 'Charley-horse of football'—this complication must be considered in handling any sports injury of the musculoskeletal system," Reed S. Clegg, MD of Salt Lake City told the Conference on Medical Aspects of Sports, held Dec 1 in Portland.
He defined the condition "specifically as the formation of bone in and about muscle which represents metaplastic bone formation," and outlined an approach to the problem and a "successful" method of treatment.
Traumatic or circumscribed myositis ossificans, the most commonly encountered of the bone-depositing group following trauma, is often limited to a single muscle or muscle group. The condition is consistent in certain muscles and involves brachialis anticus, biceps brachialis, quadriceps femoris, and abductors of the thigh. A rather sharply circumscribed type of injury usually precedes the positive x-ray changes by 10 to 12 days, Clegg
Treating Myositis Ossificans—The Charley-Horse of Football. JAMA. 1964;187(3):37. doi:10.1001/jama.1964.03060160093043