Iliotibial band syndrome (ITBS), also known as iliotibial band friction syndrome, is a common overuse injury that affects the outer side of the knee. The iliotibial band is a thick band of fascia that runs f (2) - download at 4shared. Iliotibial band syndrome (ITBS), also known as iliotibial band friction syndrome, is a common overuse injury that affects the outer side of the knee. The iliotibial band is a thick band of fascia that runs f (2) is hosted at free file sharing service 4shared.