干细胞 干细胞临床实践 干细胞移植 造血干细胞 外周血 股骨头坏死 缺血性 早期 髂骨 自体 髋关节 Harris评分 stem cel s stem cel clinical practice stem cel transplantation hemopoietic stem cel s peripheral blood osteonecrosis of the femoral head ischemic early iliac bone autologous hip joint Harris score