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Procedure of simth-petersen (SP) approach for open surgery. (A) Expose along the gap between tensor fascia lata and sartorius muscle; (B) Expose the rectus femoris; (C) Ligate the ascending branch of the lateral femoral circumflex artery; (D) Pull the iliopsoas inward; (E, F) Cut the joint capsule and rotate the lower leg to expose the focus.
