Efficacy of gluteus medius bone grafting with vascular pedicle combined with bone morphogenetic protein and autogenous cancellous bone for non-traumatic osteonecrosis of the femoral head in 69 cases with 83 hips Chinese Journal of Tissue Engineering Research . 2011, (43): 8159 -8162 .  DOI: 10.3969/j.issn.1673-8225.2011.43.043