MAIN OUTCOME MEASURES: Femur head sites, neck sites and trochanteric sites were radiocounted according to the technology of ROI which based on radioactivity counting of middle femur.

• 主要观察指标：利用计算机“感兴趣区”技术，选取患肢股骨干中点计数为基准，分别计算各时相股骨头、颈和转子区放射性核素计数比。