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Automated finite element meshing of the lumbar spine: Verification and validation with 18 specimen-specific models

机译:腰椎自动有限元网格划分:使用18个特定于样本的模型进行验证和确认

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The purpose of this study was to seek broad verification and validation of human lumbar spine finite element models created using a previously published automated algorithm. The automated algorithm takes segmented CT scans of lumbar vertebrae, automatically identifies important landmarks and contact surfaces, and creates a finite element model. Mesh convergence was evaluated by examining changes in key output variables in response to mesh density. Semi-direct validation was performed by comparing experimental results for a single specimen to the automated finite element model results for that specimen with calibrated material properties from a prior study. Indirect validation was based on a comparison of results from automated finite element models of 18 individual specimens, all using one set of generalized material properties, to a range of data from the literature. A total of 216 simulations were run and compared to 186 experimental data ranges in all six primary bending modes up to 7.8 Nm with follower loads up to 1000 N. Mesh convergence results showed less than a 5% difference in key variables when the original mesh density was doubled. The semi-direct validation results showed that the automated method produced results comparable to manual finite element modeling methods. The indirect validation results showed a wide range of outcomes due to variations in the geometry alone. The studies showed that the automated models can be used to reliably evaluate lumbar spine biomechanics, specifically within our intended context of use: in pure bending modes, under relatively low non-injurious simulated in vivo loads, to predict torque rotation response, disc pressures, and facet forces. (C) 2016 Elsevier Ltd. All rights reserved.
机译:这项研究的目的是寻求广泛的验证和验证使用以前发布的自动算法创建的人腰椎有限元模型。自动化算法对腰椎进行分段CT扫描,自动识别重要的界标和接触面,并创建一个有限元模型。通过检查关键输出变量响应于网格密度的变化来评估网格收敛。通过将单个样本的实验结果与该样本的自动有限元模型结果进行比较,以进行半直接验证,该结果具有先前研究中已校准的材料特性。间接验证是基于对18个单独样本的自动有限元模型的结果(均使用一组广义的材料属性)与文献中的一系列数据进行比较的结果。总共进行了216次模拟,并在所有7.8 Nm的所有六个主要弯曲模式下与186个实验数据范围进行了比较,从动载荷最大为1000N。在原始网格密度下,网格收敛结果显示关键变量的差异小于5%。翻了一番。半直接验证结果表明,自动化方法产生的结果可与手动有限元建模方法相比。间接验证结果表明,仅由于几何形状的变化,结果范围就很大。研究表明,自动模型可用于可靠地评估腰椎生物力学,特别是在我们预期的使用范围内:在纯弯曲模式下,在相对较低的无伤害模拟体内负荷下,预测扭矩旋转响应,椎间盘压力,和方面的力量。 (C)2016 Elsevier Ltd.保留所有权利。

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