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US images and schematic drawings of the sciatic nerve (SN, yellow color) in its long axis in the (A) neutral position and (B) with hip internal rotation. GMA: gluteus maximus muscle; SG: superior gemellus muscle; IS: ischial spine; OI: obturator internus muscle; IG: inferior gemellus muscle; QF: quadratus femoris muscle; arrowhead, kinking of the sciatic nerve.
