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对微型和均质化的有限元模拟进行比较分析,以预测状骨螺丝的承载能力

Antoine Vautrin¹, Patrik Wili², Simone Poncioni³

¹AO Research Institute Davos, Switzerland; Graduate School for Cellular and Biomedical Sciences, University of Bern, Switzerland.

Journal of the mechanical behavior of biomedical materials

|August 19, 2025

概括

同质化有限元素 (hFE) 模拟准确预测骨螺丝结构的稳定性,为临床应用提供了微有限元素 (μFE) 分析的更快替代方案.

科学领域:

生物力学生物力学
生物材料工程生物材料工程
计算力学计算力学计算力学

背景情况:

骨折固定植入物需要足够的稳定性才能成功地进行骨质合成.
骨螺丝结构的故障可能是由于生物机械接口稳定性不足而产生的.
有限元 (FE) 模拟为研究故障机制提供了体外试验的替代方案.

研究的目的:

评估和比较微型FE (μFE) 和均质FE (hFE) 模型的产量后行为预测能力.
评估μFE和hFE复制骨螺丝结构承载能力的能力,通过实验确定.

主要方法:

十二只牛近腹骨的脊椎骨样本用插入的螺丝承受了单调的负荷.
基于微计算机断层扫描 (μCT) 数据,构建了特定样本的μFE和hFE模型.
在两种FE方法中,以复制实验条件,以相同的方式建模了elasto-plastic行为.

主要成果:

两种μFE (R2 = 0.89) 和hFE (R2 = 0.95) 模拟都显示出与实验最终负载的良好相关性,尽管两者都系统地高估了它们.
hFE预测与μFE预测的相关性很好 (R2 = 0.84),并且计算速度约为75倍.
hFE证明适合预测骨螺丝在椎骨中的初级稳定性.

结论:

同质化FE分析是一种可行且计算效率高的方法,用于预测骨结构稳定性.
hFE的速度和准确性支持其在骨折固定分析中的临床翻译潜力.
hFE利用低分辨率CT图像的能力进一步提高了其临床适用性.

关键词:

骨头螺丝螺丝是什么意思骨-植入物接口的接口故障负载的负载是错误的有限元素分析的研究.主要稳定性主要稳定性

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