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There are several physical exam maneuvers used to test iliotibial band function and provoke symptoms diagnostic of ITBS. The Noble test is used to assess for iliotibial band disfuction, in which the examiner extends the patient's knee from the 90 degree position with pain over the lateral femoral epicondyle occurring at 30 degrees of flexion.
The iliotibial tract or iliotibial band (ITB; also known as Maissiat's band or the IT band) is a longitudinal fibrous reinforcement of the fascia lata.The action of the muscles associated with the ITB (tensor fasciae latae and some fibers of gluteus maximus) flex, extend, abduct, and laterally and medially rotate the hip.
In some cases, an audible snapping or popping noise as the tendon at the hip flexor crease moves from flexion (knee toward waist) to extension (knee down and hip joint straightened). It can be painless. [2] After extended exercise, pain or discomfort may be present caused by inflammation of the iliopsoas bursae. [3]
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The Ober test is used in physical examination to identify tightness of the iliotibial band (iliotibial band syndrome). During the test, the patient lies on his/her side with the unaffected leg on the bottom with their shoulder and pelvis in line. The lower hip and knee can be in a flexed position to take out any lordosis of the lumbar spine. [1]
The tensor fasciae latae is a tensor of the fascia lata; continuing its action, the oblique direction of its fibers enables it to stabilize the hip in extension (assists gluteus maximus during hip extension). The fascia lata is a fibrous sheath that encircles the thigh like a subcutaneous stocking and tightly binds its muscles.