Fig. 5

Three patients with ONFH underwent NVBG with three surgery techniques. A–C A 33-year-old male patient left alcohol-induced ONFH; B postoperative radiograph showing that the left femoral head was underwent NVBG with lightbulb technique, and the frog lateral x-ray position was not standard because of pain; C radiographs taken 30 months post operation show a restoration of bone. D–F A 24-year-old female patient right steroid-induced ONFH; E postoperative radiograph showing that the right femoral head was underwent NVBG with Phemister technique; F radiographs taken 75 months post operation show no further collapse happened; G–I A 41-year-old male patient left steroid-induced ONFH; H postoperative radiograph showing that the left femoral head was underwent NVBG with trapdoor technique; I radiographs taken 63 months post operation show the necrotic area was partially repaired