The iliotibial tract or iliotibial band (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. The ITB contributes to lateral knee stabilization. During knee extension the ITB moves anterior to the lateral condyle of the femur, while ~30 degrees knee flexion, the ITB moves posterior to the lateral condyle. However, it has been suggested that this is only an illusion due to the changing tension in the anterior and posterior fibers during movement. It originates at the anterolateral iliac tubercle portion of the external lip of the iliac crest and inserts at the lateral condyle of the tibia at Gerdy's tubercle. The figure shows only the proximal part of the iliotibial tract.
The part of the iliotibial band which lies beneath the tensor fasciae latae is prolonged upward to join the lateral part of the capsule of the hip-joint. The tensor fasciae latae effectively tightens the iliotibial band around the area of the knee. This allows for bracing of the knee especially in lifting the opposite foot.
The gluteus maximus muscle and the tensor fasciae latae insert upon the tract.
【 語 句 】
・reinforcement：補強、強化 ・fascia lata：大腿筋膜 ・tensor fasciae latae：大腿筋膜張筋 ・gluteus maximus：大殿筋 ・lateral condyle：外側顆 ・femur：大腿骨 ・iliac tubercle：腸骨結節 ・external lip：外唇 ・iliac crest：腸骨稜 ・tibia：脛骨 ・Gerdy's tubercle：ジェルディ結節
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