远部骨截面的均质化有限元分析:成果和局限性
Mathieu Simon1, Michael Indermaur1, Denis Schenk1
1ARTORG Centre for Biomedical Engineering Research, University of Bern, Bern, Switzerland.
Bone reports
|April 9, 2024
概括
同质化有限元素 (hFE) 分析准确地预测了远部骨部分的刚性和产量负载. 然而,hFE并不能捕捉这些承重骨段的产后应变局部化或故障模式.
科学领域:
- 生物力学 生物力学
- 整形外科的研究研究.
- 计算建模计算建模
背景情况:
- 高分辨率的外围定量计算断层扫描 (HR-pQCT) 和微有限元素 (μFE) 分析可以准确预测骨的机械性质.
- 同质化有限元 (hFE) 方法已被验证用于更大的骨段,包括远半径.
- 远端骨的机械完整性在临床上越来越重要.
研究的目的:
- 建立一个全面的机械数据集,用于远距离部段的压缩行为.
- 将hFE预测的结构性质与实验结果进行定量比较.
- 评估hFE能够捕捉出产后应变局部化和骨折区域在远部部部分的能力.
主要方法:
- 在压缩测试失败后,使用微型计算机断层扫描 (μCT) 分析了25个人类远距离部段.
- 骨矿物质含量 (BMC) 和体积骨矿物质密度 (vBMD) 与机械测试结果相关.
- 进行了hFE分析,以将计算预测 (刚性,产量负载,塑性变形) 与实验数据和应变局部化的数字体积相关性 (DVC) 进行比较.
主要成果:
- 骨矿物质含量 (BMC) 与硬度 (R2=0.92) 和产量负荷 (R2=0.88) 强烈相关.
- hFE的预测与实验数据对刚度 (R2=0.96) 和产量负载 (R2=0.95) 的预测非常一致.
- 在大多数样本中 (15/25),菌株局部化模式显示hFE和DVC之间的一致性较差,只有2/25显示良好一致性.
结论:
- 该hFE方法可靠地捕获远部部部分的弹性和屈服反应.
- 由于其基于连续性的性质,hFE分析在预测产量后行为方面是有限的,包括菌株定位和故障区.
- 通过使用具有完整皮质外的较长骨段来实现hFE菌株局部化预测的改进,类似于对远半径的研究.
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