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一个新的个性化的均质有限元素模型,用于预测无取消性骨螺丝的拉出强度

Alireza Rouyin¹, Mohammadjavad Matin Einafshar², Navid Arjmand³

¹Department of Mechanical Engineering, Sharif University of Technology, Tehran, 11155-9567, Iran.

Journal of orthopaedic surgery and research

|November 7, 2024

概括

一个新的基于个性化计算机断层扫描 (CT) 的同质有限元素 (FE) 模型准确地预测了骨螺丝的拉出力,特别是在无关节骨中,减少了模拟的复杂性.

科学领域:

生物机械工程生物机械工程
整形外科手术整形外科手术
医疗成像医学成像

背景情况:

手术后的螺丝松动是骨科固定的一个风险.
螺丝拉出强度通常通过实验或有限元素 (FE) 分析来评估.
目前的FE模型是复杂的异质或简化的同质,精度不同.

研究的目的:

开发和验证一种基于个性化计算机断层扫描 (CT) 的新型均质FE模拟方法.
准确地预测取消无骨螺丝的拉出力.
为复杂的FE建模提供一种简单而可靠的替代方案.

主要方法:

进行了20次FE模拟L1-L5脊椎螺丝拉出测试 (10种异质,10种同质).
一个新的同质模型使用参考体积 (双螺丝直径) 来进行材料属性赋值.
获得的材料属性被同质地应用于整个脊椎,用于拉出模拟.

主要成果:

新的同质模型预测了拉出力,与异质模型相比,平均误差约为7.9%.
当只涉及取消性骨 (L1-L3脊椎) 时,错误率为<6.0%.
当皮层骨发生 (L4-L5脊椎) 时,错误增加到~11%.

结论:

提出的基于CT的个性化同质模型在估计螺丝拉出力方面表现出高准确度.
准确性尤其显著,当螺丝拉出主要涉及取消的骨头.
这种方法为预测骨科应用中的螺丝稳定性提供了一个有希望的,简化的方法.

关键词:

骨头螺丝拉出强度强度拉出强度不同质的材料映射绘制.同质的有限元素.材料的分配材料的分配整形外科的螺丝.个性化的有限元素分析.

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