使用无网格计算方法比较常见的近端大腿骨固定装置的动态切断失败模式
Erica Ueda Boles1,2,3, Sloan Kulper1,2,3, Katie Whiffin1
1Lifespans Ltd., Hong Kong, China.
概括
叶片部植入物在动态负载测试中比螺杆类型更好地抵抗初始迁移. 然而,随着负载的持续,没有一种植入物类型表现出明显的优势,这凸显了在设备评估中需要先进的模拟.
科学领域:
- 骨科生物力学 骨科生物力学
- 生物材料工程是生物材料的工程.
- 手术器械性能分析手术器械性能分析
背景情况:
- 由于迁移和切断,trochanteric骨折的内部固定通常会失败.
- 了解在生理负荷下设备的性能对于改善患者的治疗结果至关重要.
研究的目的:
- 为了比较四个常见的内部固定装置 (DHS,Gamma3,PFNA-II,TFNA) 在动态负载下的性能.
- 评估无网状模拟在预测骨泡失效模式和设备切断的准确性.
主要方法:
- 在静态和动态步态模拟负荷下,在聚氨骨泡模型中对四个部植入物的基板测试.
- 使用经过实验验证的多孔泡材料模型进行物理测试的无网状计算模拟.
- 分析植入物迁移,切除阻力和骨泡损伤量.
主要成果:
- 叶片型植入物在动态负载下表现出比螺丝型植入物更好的初始抵抗迁移.
- 随着动态加载的进展,设备之间没有观察到整体性能显著差异.
- 模拟准确地预测了物理测试结果 (一致性相关系数> 0.858).
- 模拟的动态负载显示了设备之间的骨损伤体积的实质差异,即使具有相似的切断力.
结论:
- 虽然叶片植入物提供了最初的迁移阻力,但在这种模型中,没有设备显示出明显的长期优势.
- 对物质损伤的计算模拟为区分植入物性能和指导临床选择提供了有价值的方法.
- 精确的模拟可以揭示从简单的负载到故障指标中看不到的骨组织损伤的差异.
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