【摘要】 目的　建立全髋关节置换术后的三维有限元模型 ,分析研究股骨柄的应力分布 ,为临床应用提供理论依据。方法　应用目前先进的大型有限元分析软件ABAQUS ,对人工髋关节在不同条件下股骨柄的主要力学性能 ,即应力分布状况进行了较为详细的计算与分析。结果　①在不同的边界条件和不同的承载状态下 ,股骨柄的应力均是随着受力方向α的增大而不断增大。②不同的边界条件对股骨柄的应力值影响较大。③应力值均与承载大小成正比 ,但应力分布曲线有所不同。结论　①接受人工髋关节置换术患者在日常生活中应避免髋关节的活动范围过大 (α<30°) ;②当仅有下三分之一股骨柄结合良好的情况下 ,无论承载大小 ,应力均随受力方向α(α >2 5°)的加大而不断的急剧增加 ,说明在受到意外暴力时容易出现骨折或股骨柄断裂 ;③当股骨柄与人体股骨结合不良的情况下 ,即使患者髋关节的活动范围较小 ,股骨柄的应力值仍较大。更多还原

【Abstract】 Objective A three dimensional finite element model of the revised total hip is established to study the stem stress distributions and to provide a theoretical foundation for the clinical practice. Methods The main mechanicel properties of the stem under different conditions of external loadings is calculated and analyzed in detail using ABAQUS finite element software. Results ① The stem stress increases as the load angle α increases under different boundary conditions and load conditions. ② The stem stress is significantly affected by boundary conditions. ③ All the stress values are in direct proportion to the load values, but the stress distribution curves change shape with respect to load value. Conclusion ① The patients after total hip replacement should avoid the activity of large range of motion of the hip joint(α<30°).② The stresses in all load conditions increase rapidly with load angle α(α>25°) increasing when only the lower third part of the stem is in contact with the bone, so the femur fracture or the stem rupture can easily take place if there is an accidental impact.③ When the stem is not in perfect contact with the human femur, the stem stress is still large even when the range of motion of the patient’s hip joint is small.更多还原