Iliotibial tract friction syndrome in athletes--an uncommon exertion syndrome on the lateral side of the knee.

An uncommon exertion pain on the lateral side of the knee is described in 88 patients, in four of whom it was bilateral. The disorder is a result of the friction of the iliotibial tract over the lateral femoral epicondyle. The syndrome is the iliotibial tract friction syndrome of ITFS. All the patients in the material were active athletes or middle-aged joggers in regular training. The cases were seen over four years and four months. The mean age of them was approximately 25 years, and there were only nine women in the series. Th pain appeared usually after running and was localised on the outer femoral condyle, and often radiated downwards along the iliotibial tract. Conservative treatment and changes in training habits cured most cases. The disorder has not often been described in the literature, and seems to appear only in physically very active people, such as athletes or military recruits.