Picture of Iliotibial Band (ITB)
Iliotibial Band: The ITB is a ligament that runs along the outside of the thigh -- from the top of the hip to the outside of the knee. It stabilizes the knee and hip during running, but when it thickens and rubs over the bone, the area can become inflamed or the band itself may become irritated -- causing pain.
Image Source: MedicineNet, Inc.
Text: MedicineNet, Inc.