1.西南医科大学附属医院 骨与关节外科;2.四川省骨科置入器械研发及应用技术工程实验室;3.西南医科大学附属医院 临床医学研究中心;4.泸州市人民医院 普儿科,四川泸州
目的 研究下胫腓联合新型微动弹性植入的力学性能,对踝关节背伸位进行研究。方法 采用仿真和实验结合的方式。利用Mimics和CT数据建立踝关节背伸位正常模型、骨钉修复模型和微动弹性植入物修复模型,并用Ansys Workbench 进行有限元分析。用Instron E10000力学实验机分别对下肢标本进行力学实验,分别测5组实验数据并分析。结果 仿真结果,背伸位微动弹性植入物修复和正常模型的各项性能都更接近,但微动弹性植入物的应力大于骨钉应力。实验结果,采用双尾分布的双样本异方差T检验反抗扭矩微动弹性修复模型和正常模型P值为0.99(0.05),无显著性差异；其他实验数据微动弹性植入物修复亦更优。结论 对背伸位,下胫腓联合微动弹性植入物修复力学性能优于骨钉修复；微动弹性植入物还有优化空间。
Objective To study the mechanical properties of the new micro-movement elastic implant of distal tibiofibular syndesmosis in dorsiflexion position. Methods A combination of simulation and experiment has been used. Mimics and the CT data have been used to establish a normal ankle dorsiflexion model, a bone nail repaired model and a micro-movement elastic implant repaired model. Besides, Ansys Workbench has been used for finite element analysis. Instron E10000 has been used to conduct mechanical experiments on the lower limb specimens, and five sets of experimental data have been measured and analyzed. Results The simulation results show that the mechanical properties of the micro-movement elastic implant repaired model is closer to that of the normal ankle dorsiflexion model. But the Von Mises stress of the micro-movement elastic implant repaired mode is greater than that of the bone nail repaired model. The experimental results show that there is no significant difference in the resistance torque between the micro-movement elastic implant repaired mode and the normal ankle dorsiflexion model with two-sample heteroscedasticity T test. Because the P value is 0.99 that is greater than 0.05. other experimental data of he micro-movement elastic implant repaired mode are also better than those of the bone nail repaired model. Conclusion for dorsiflexion position, the repairing mechanical properties of he new micro-movement elastic implant are much better than those of the bone nail. And there is still room to optimize the new micro-movement elastic implant.