1.四川省骨科置入器械研发及应用技术工程实验室;2.西南医科大学附属医院 临床医学研究中心;3.西南医科大学附属医院 骨与关节外科
1.Sichuan Provincial Laboratory of Orthopaedic Engineering,LuZhou,SiChuan,;2.The Clinical Medicine Research Center,The Affiliated Hospital of Southwest Medical University,LuZhou,SiChuan;3.Department of Orthopedics,The Affiliated Hospital of Southwest Medical University,LuZhou,SiChuan;4.Department of Orthopedics,The Affiliated Hospital of Southwest Medical University,LuZhou,SiChuan,;5.The Clinical Medicine Research Center,The Affiliated Hospital of Southwest Medical University,LuZhou,SiChuan,
目的 验证所推导的骨钉力学性能公式的有效性,分析骨钉参数对其力学性能的影响。方法 建立骨钉-聚氨酯泡沐块的物理模型,推导骨钉自攻性能和拔出性能的计算公式；用聚氨酯泡沐块模拟人骨,参考ASTM F543-07金属医用骨钉标准规范,用Instron E3000力学试验机对抽选的HAZ、HBZ不同直径的自攻骨钉进行试验验证,分别测出5组骨钉的自攻力、自攻力矩和拔出力数据。 结论 除开个别误差较大的点外,计算值和实测值基本一致；二者平均误差为12.37%,总体来说理论计算值具有较高的可信度。骨钉越粗或者牙高越高,所需的自攻力和拔出力越大。 研究结果为骨钉力学性能的判断提供了计算依据,并为后续骨钉的优化改进提供参考和方向。
Objective To test the validity of the TC4 self-taping bone screw’s mechanical equation and analyze the impact resulted from its parameters. Methods In order to derive the equation of self-taping and pull-out, built the bone screw-polyurethane foam block physical model. Referencing ASTMF543-07 standard specification and test methods for metallic medical bone screw, Do the mechanical verification tests of HAZ and HBZ with Instron E3000 and analyze the data of self-taping force、self-taping torque and pull-out force. Results the calculated and measured values are basically the same, except for few points with large individual errors. And the average error of the two is 12.37%, so the theoretical calculation formula is highly credible. Besides, the larger the bone screw’s diameter or the higher the bone screw’s tooth height, the greater the forces of the self-taping and the pull-out required. The research results have provided a calculation basis for the mechanical properties of the bone screw and a research direction for the optimization and improvement of the bone screw.