国家自然科学面上基金资助项目(基金号：61772172)；常州市卫计委重大项目资助(基金号：ZD201617)*通讯作者：张文,研究方向：骨生物力学,E-mail：email@example.com. ,张文*2,蒋俊锋3,翁益平 1,徐南伟 1,张云坤 1,王彩梅4
目的 通过有限元分析方法评价个性化钛合金短柄股骨假体的生物力学性能。方法 在已经验证有效性的股骨有限元模型基础上,模拟股骨颈基底部截骨,通过置入不同短柄股骨柄假体,分别建立SMF柄模型(模型A)、BE 1柄模型(模型B)、MINI柄(模型C)和个性柄模型(模型D)。对4组模型施加同样的载荷和约束,通过计算分析观察模型间的Von Mises应力分布和变形量,比较各组模型间的力学稳定性。 结果 所有术后模型的变形量刚度都比生理状态要小。模型B和模型C的变形量刚度接近,模型A和模型D的刚度接近。模型C的最大应力峰值高于其他组模型,达到95.55MpaMPa,整体应力趋势是模型C>模型B>模型D>模型A>生理状态。 结论 个性化钛合金短柄股骨假体的应力峰值、应力分布与SMF柄相当,应力分布合理,对股骨近端应力遮挡小,应力下假体整体变形度及剪切应力最小,其有效性和稳定性能满足人体生物力学要求,可为关节外科医生和假体研发人员提供参考。
Objective To evaluate the biomechanical properties of personalized titanium alloy short femoral prosthesis by finite element analysis. Methods Based on the validated femoral finite element model, the base of the femoral neck was simulated, and by inserting different short femoral prostheses, the SMF stem model (model A), BE 1 stem model (model B), MINI stem (model C) and personalized stem model (model D) were established respectively. The same loads and constraints were applied to the four groups of models, the Von Mises stress distribution and deformation between the models were calculated and analyzed, and the mechanical stability of each model was compared. Results The deformation of all models was smaller than that of physiological state of femur. The deformation of model B is close to that of model C, and model A is close to that of model D. The maximum stress peak of model C is higher than that of other models, reaching 95.55MPa. The overall stress trend is model C > model b > model d > model a > physiological state. Conclusion The stress peak and distribution of personalized short femoral stem are similar to that of SMF stem, the stress distribution is reasonable, the stress shielding of the proximal femur is small, the overall deformation and shear stress of the prosthesis is minimum, and its effectiveness and stability meet the requirements of human biomechanics, which can provide reference for Joint Surgeons and technical staffs.