Iliotibial band friction syndrome (ITBFS) is an overuse injury causing lateral knee pain. There is evidence that the pathological lesion is in fact an inflamed bursa underlying the iliotibial band (ITB) rather than an inflamed ITB itself.
Division of Sports Medicine, Department of Orthopaedic Surgery, Massachusetts General Hospital, Boston, Massachusetts 02114-2696, USA. sanaz@post.harvard.edu