Definition:

The iliotibial band or IT band is a tendon that begins at the iliac crest and distally inserts at Gerdy’s tubercle which is located on the anterior surface of the lateral tibial condyle. The IT band is a continuation of the fascia lata. Moreover, the IT band runs from the top of your hip down to the lateral aspect of the knee. IT band syndrome occurs when this tendon creates increased friction with the lateral femoral condyle. This friction can cause inflammation and pain on the outside of the knee. Sometimes the pain will extend into the side of the thigh and hip. The lateral knee pain is usually present during activity and is improved with rest. IT band syndrome can be present bilaterally (both legs).