[目的]验证蘑菇状表面置换假体植入股骨头内后,既能即时承重,又能减轻应力遮蔽从而实现假体长期稳定.[方法]建立了股骨近端简化三维模型,通过有限元方法对比分析植入前后股骨内部对应各采样点的受力情况.[结果]运行结果显示,置换后股骨头内部最大应力不到40 MPa,该置换假体具有足够的机械支撑强度,满足其基本功能;而且置换体上下两部分都能有效受力,可减轻股骨头内部应力遮蔽现象.[结论]此表面置换假体能够实现即期和长期稳定,并将为解决股骨头置换假体的下沉和松动问题提供新的设计思路.“,”[Objective]To test and prove the mushroom shaped surface prosthesis of femoral head not only can be a weightbearing device,but also could reduce stress-shelter and achieve long-term stability. [Method] A simplified three-dimensional model of femoral head was made. And the biomechanics of femoral head. Were compared by finite element analysis in two states:with and without the replacement. [Result]It showed that the maximum of strees in famoral head was less than 40Mpa,consequently the re-placement had sufficient strength to meet its basic function. Furthermore, the prosthesis bear the force both at up part and down. Therefore it reduced stress-shelter. [Conclusion]This prosthesis can achieve immediate and long-term stability. And it provides new ideas for designing the femoral head resurfacing prosthesis.