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The iliotibial band (ITB) (also referred to as the iliotibial tract) is a thick band of fascia along the lateral aspect of the thigh. It is a thickening in the fascia lata. Superiorly, it splits to enclose and anchor the aponeurosis of tensor fasciae latae and posteriorly most of the tendon of gluteus maximus 1.
The band consists of deep and superficial layers, with distal insertions as follows:
the superficial layer is the main tendinous component and inserts onto Gerdy's tubercle on the anterior lateral tibia
the deep layer inserts on the intermuscular septum of the distal femur
A small recess exists between the lateral femoral epicondyle and the iliotibial band, which contains a synovial extension of the knee joint capsule (lateral synovial recess) 1-4.
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