To evaluate the effect of hip surfacereplacement on bone mineral density of proximal femur compared with THA group.
通过表面置换和全髋置换术后股骨近端骨密度的比较，来评估表面置换对股骨近段骨密度的影响。
2
To study the method and curative effect of total hip surfacereplacement using non-image based surgical navigation system.
探讨非影像手术导航系统下进行全髋关节表面置换的方法和疗效。
3
Conclusion Total hip surfacereplacement is one of the best choice for the treatment of osteonecrosis of the femoral head in young and middle-aged, and gets satisfactory result.