Fig. 1

Schematic diagram of iliac bone flap with deep circumflex iliac artery cut by "anterograde anatomy." A Preoperative design of iliac bone flap resection. B The aponeurosis of the external oblique was exposed. C The internal oblique muscle was cut at the midpoint of the inguinal ligament to find the main shaft of the deep circumflex iliac vessel, which was then followed up the main shaft until the iliac bone flap and perforator were completely exposed. D–G Bone knife chiseling iliac bone flap. H–I Complete free iliac bone flap. J The supply area is directly closed