Noble's test is performed with the patient lying on his back. The examiner holds the affected leg underneath the knee on the joint line and places his or her thumb on the IT band insertion site (near the outside). The examiner then passively flexes the patient’s knee while applying pressure over that spot.
If the patient complains of pain, especially when the knee is near 30 degrees of flexion, they are showing positive signs of iliotibial band friction syndrome.
(This answer provided for NATA by the Gustavus Adolphus College Athletic Training Education Program.)