Nonlinear finite element model predicts vertebral bone strength and fracture site
Nonlinear finite element model predicts vertebral bone strength and fracture site
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DOI：
10.1097/01.brs.0000225993.57349.df
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发表时间：
2006-07-15
期刊：
影响因子：
3
通讯作者：
Nakamura, Kozo
中科院分区：
文献类型：
--
作者：
Imai, Kazuhiro;Ohnishi, Isao;Nakamura, Kozo
研究设计.基于计算机断层扫描（CT）的有限元（FE）方法预测人体尸体椎骨强度和骨折部位的研究。通过将预测数据与力学测试数据进行比较，评估非线性有限元方法的准确性。有限元方法可以预测椎体强度和骨折部位，但由于椎体的几何形状复杂、弹塑性和皮质薄，预测一直很困难。建立了12个胸腰椎标本的有限元模型。进行了非线性有限元分析，并屈服载荷，断裂载荷，元件失效的位置，和最小主应变的分布进行了评估。对相同试件进行了准静态单轴压缩试验，以验证这些分析。有限元预测的屈服载荷、断裂载荷、最小主应变和断裂位置与测量值显著相关。非线性有限元模型预测椎体强度和骨折部位准确。
Study Design. A study on computed tomography (CT)-based finite element (FE) method that predicts vertebral strength and fracture site using human cadaveric specimens.Objective. To evaluate the accuracy of the nonlinear FE method by comparing the predicted data with those of mechanical testing.Summary of Background Data. FE methods may predict vertebral strength and fracture site but the prediction has been difficult because of a complex geometry, elastoplasticity, and thin cortical shell of the vertebra.Methods. FE models of the 12 thoracolumbar vertebral specimens were constructed. Nonlinear FE analyses were performed, and the yield load, the fracture load, the sites where elements failed, and the distribution of minimum principal strain were evaluated. A quasi-static uniaxial compression test for the same specimens was conducted to verify these analyses.Results. The yield loads, fracture loads, minimum principal strains, and fracture sites of the FE prediction significantly correlated with those measured.Conclusions. Nonlinear FE model predicted vertebral strength and fracture site accurately.