Zhao D, et al. – This multicenter study was performed to analyze the results of the use of the vascularized iliac bone flap transfer for management of Osteonecrosis of the femoral head (ONFH). In this study, the vascularized iliac bone flap transfer showed good results for arresting the osteonecrosis progress and improving the hip function of patients with pre–collapse stages of ONFH.