Iliotibial Band Syndrome
The Iliotibial Band (ITB) is a long band of connective tissue originating from two muscles on the outer aspect of the hip, the tensor fascia latae (TFL) and the gluteus maximus, and runs down the outer aspect of the thigh past the knee and attaches into the tibia (shin bone).
ITB syndrome occurs when the ITB repetitively rubs against the outer part of the knee resulting in irritation, damage and/or inflammation of the ITB and surrounding tissues. The ITB is more likely to rub against the outer part of the knee when the knee is in slight flexion, meaning people who do a lot of running or jogging are more likely to develop ITB syndrome.
ITB syndrome presents as pain over the lateral (outside) aspect of the knee, which gradually increases over days to weeks.