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This is due to inflammation of the iliotibial band, a thick band of fibrous tissue that runs down from the lateral hip to the lateral tibia on the outside of the leg. The band functions in hip abduction
and internal rotation and knee flexion and extension. The pain in ITBS usually occurs over the outside of the knee joint at the lateral epicondyle (end of femur bone). The pain tends to start after a few
minutes into a run and remains for the duration of the run. After stopping running, there can be a severe, sharp pain that lingers on for some time. Some causes are: overtraining, excessive downhill
running, worn shoes, tightness of ITB muscle, and pronation.
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