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Myositis ossificans: a serious complication of a minor injury.

A 24-year-old man sustained a direct blow to his right thigh in a rugby tackle. After a short rest he continued playing for 20 minutes. Later he was seen in a local emergency department with tenderness and swelling of the thigh. He was given a support bandage and advised to rest his leg and take analgesia. Later that night he had a warm bath and drank a few cans of beer. The next day his thigh had swollen further and knee flexion was greatly restricted. He attended his family doctor who diagnosed a hematoma, and he was referred for physiotherapy. Despite localized treatment and exercises he failed to improve. After 5 weeks he was referred to another emergency department for review. The history and clinical findings of marked swelling, tenderness and restricted knee flexion suggested a diagnosis of myositis ossificans, which was confirmed on radiographic examination (Fig. 1).