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An unusual fibrous band in the thigh of an adolescent.

A fibrous band associated with the rectus femoris and presenting for the first time in an 18-year-old boy is described. There were no congenital anomalies and no history of intramuscular injections, and this is believed to be the first report of its kind in the orthopaedic literature. Knee flexion was greatly improved by excising the band.