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What causes Iliotibial (IT) band syndrome?

IT Band syndrome (ITBS) is a result of friction between the IT band and the lateral femoral epicondyle (bony point at the lower end of the femur or thigh bone). Repeated knee flexion and extension causes the bursa (a small fluid filled sac) between the IT band and the lateral femoral epicondyle to become inflamed and painful. Athletes with genu recurvatum (hyperextension of the knee) or strength imbalances between the hamstring and quadriceps muscle groups are more likely to experience IT band syndrome.

This answer provided for NATA by Loras College.

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