Load sharing within a human lumbar vertebral body using the finite element method.
Load sharing within a human lumbar vertebral body using the finite element method.
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DOI：
10.1097/00007632-200106150-00011
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发表时间：
2001-06-15
期刊：
影响因子：
3
通讯作者：
Yang, K H
中科院分区：
文献类型：
--
作者：
Cao, K D;Grimm, M J;Yang, K H
研究设计：进行了有限元参数研究，以调查的结构作用的椎骨皮质壳和小梁centrum.PROTETIVES：为了解决有争议的问题的相对承载作用的椎骨皮质壳。摘要背景数据：几个实验和计算研究的目的是量化的承载作用的人类椎骨皮质壳和小梁centrum。这些研究，但是，支持没有consensus.METHODS：一个有限元模型的三个腰椎椎体的开发预测的分数的总压缩负荷作用于腰椎椎体，在两种不同的负载条件下，这是支持的皮质壳。在椎骨材料和几何特性的参数变化进行了检查，以确定这一分数是如何影响这种changes.RESULTS：皮质壳支持的压缩载荷的分数被发现是强烈依赖于从终板的距离，增加约34%，在任何终板约63%，在midtransverse平面。该分数与载荷特性无关，与皮质的性质成正比，与椎体的模量成反比。此外，皮质壳力分数的影响显着的整体椎骨geometrics. CONCLUSIONS的变化：我们的研究结果表明，皮质壳和椎体交替的结构优势取决于椎体内的位置。然而，随着年龄相关性骨丢失的进展，皮质壳的承载作用可能会显著增加。
STUDY DESIGN: A finite element parametric study was performed to investigate the structural roles of the vertebral cortical shell and the trabecular centrum.OBJECTIVES: To address the debated issue of the relative load-carrying role of the vertebral cortical shell.SUMMARY OF BACKGROUND DATA: Several experimental and computational studies have been aimed at quantifying the load-carrying roles of the human vertebral cortical shell and trabecular centrum. These studies, however, have supported no consensus.METHODS: A finite element model of three lumbar vertebral bodies was developed to predict the fraction of the total compressive load acting on the lumbar vertebral body, under two different loading conditions, that was supported by the cortical shell. Parametric variations in vertebral material and geometric properties were examined to determine how this fraction was influenced by such changes.RESULTS: The fraction of the compressive load supported by the cortical shell was found to be strongly dependent on the distance from the endplate, increasing from about 34% at either endplate to approximately 63% at the midtransverse plane. This fraction was independent of the loading characteristics, proportional to the properties of the cortex, and inversely proportional to the modulus of the centrum. Additionally, the cortical shell force fraction was affected significantly by changes in the overall vertebral geometry.CONCLUSIONS: Our findings indicate that the structural dominance of the cortical shell and centrum alternate depending on the location within the vertebral body. However, as age-related bone loss progresses, the load-carrying role of the cortical shell could increase significantly.