Updated December 19, 2014.
Definition: Iliotibial band syndrome (ITBS) is due to irritation and inflammation of the iliotibial band, a thick band of fibrous tissue that runs along the outside of the leg. The iliotibial band begins at the hip and extends to the outer side of the shin bone (tibia) just below the knee joint. The iliotibial band functions in coordination with several of the thigh muscles to provide stability to the outside of the knee joint.
Definition: Iliotibial band syndrome (ITBS) is due to irritation and inflammation of the iliotibial band, a thick band of fibrous tissue that runs along the outside of the leg. The iliotibial band begins at the hip and extends to the outer side of the shin bone (tibia) just below the knee joint. The iliotibial band functions in coordination with several of the thigh muscles to provide stability to the outside of the knee joint.