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Iliotibial band syndrome causes knee pain on the outside of the knee from friction of the iliotibial band on the side of the knee. It is also known as ITB syndrome or ITBFS and sometimes referred to as runners knee.
Certain factors may make you more susceptible to developing runners knee or iliotibial band syndrome. A naturally tight or wide IT band may make someone more susceptible to this injury. Weak hip muscles such as gluteus medius are also thought to be a significant factor.
Over pronation or poor foot bio mechanics may increase the risk of injury. If the foot rolls in or flattens, the lower leg rotates and so does the knee increasing the chance of friction on the band. Other factors include leg length difference, running on hills or on cambered roads.