Traumatic myositis ossificans circumscripta represents a localized, ossified response to an acute or chronic avulsion injury. In many instances of spontaneous occurrence, trivial injury may pass unrecognized. The ectopic bone may lie parallel to the shaft of the patient bone, or along the muscle axis within the fascial plane(1). Avulsion fracture, especially of apophyseal centers, often permits these fragments to grow and mature as separate bones. These separate bones persist into adulthood and are readily identified on x-ray.