The Iliotibial band, more commonly known as the IT Band, is the long thick band of fascia (connective tissue) that extends from lateral iliac crest of the hip (thigh) to the outer portion of the tibia (knee), hence the name “iliotibial.” Over time, this band can become inflamed, especially during athletic training. Friction over the knee joint causes pain on the lateral side of the knee which causes Iliotibial Band Syndrome (ITBS).