A comparative study on the mechanical behavior of intervertebral disc using hyperelastic finite element model

Xie, Feng; Zhou, Huanyi; Zhao, Weian; Huang, Lixin

doi:10.3233/thc-171320

Cited by 11 publications

(6 citation statements)

References 24 publications

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“…Young's modulus was set as cortical bone: 12,000 MPa, cancellous bone: 1,500 MPa, IVD: 10 MPa. Poisson's ratio was set as cortical bone: 0.3, cancellous bone: 0.3, IVD: 0.4, according to a previously published paper ( 24 ). Dynamic analysis was performed assuming that the volunteer fell on his/her buttocks and load was applied to the spine.…”

Section: Methodsmentioning

confidence: 99%

Finite element analysis of compression fractures at the thoracolumbar junction using models constructed from medical images

et al. 2018

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Vertebral fractures commonly occur at the thoracolumbar junction. These fractures can be treated with mild residual deformity in many cases, but are reportedly associated with increased risk of secondary vertebral fractures. In the present study, a three-dimensional (3D) whole spine model was constructed using the finite element method to explore the mechanism of development of compression fractures. The 3D model of the whole spine, from the cervical spine to the pelvis, was constructed from computed tomography (CT) images of an adult male. Using a normal spine model and spine models with compression fractures at the T11, T12 or L1 vertebrae, the distribution of strain was analyzed in the vertebrae after load application. The normal spine model demonstrated greater strain around the thoracolumbar junction and the middle thoracic spine, while the compression fracture models indicated focused strain at the fracture site and adjacent vertebrae. Increased load time resulted in the extension of the strain region up to the middle thoracic spine. The present findings, that secondary vertebral fractures commonly occur around the fracture site, and may also affect the thoracic vertebrae, are consistent with previous clinical and experimental results. These results suggest that follow-up examinations of compression fractures at the thoracolumbar junction should include the thoracic spine and adjacent vertebrae. The current data also demonstrate that models created from CT images can be used for various analyses.

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Section: Methodsmentioning

confidence: 99%

Finite element analysis of compression fractures at the thoracolumbar junction using models constructed from medical images

et al. 2018

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“…Young's modulus was set as follows: cortical bone (spine, rib, and sternum), 12,000 MPa; cancellous bone (spine, rib, and sternum), 1500 MPa; intervertebral disc, 10 MPa; and costal cartilage, 24.5 MPa. Poisson's ratio was set as follows: cortical bone, 0.3; cancellous bone, 0.3; intervertebral disc, 0.4; and costal cartilage, 0.3, according to a previously published paper as discussed by Xia et al [4] (Table 1). Dynamic analysis was performed by simulating a person falling on the buttocks, with load applied to the spine.…”

Section: Methodsmentioning

confidence: 99%

Finite Element Method Analysis of Compression Fractures on Whole-Spine Models Including the Rib Cage

Nishida

Ohgi

Jiang

et al. 2019

Computational and Mathematical Methods in Medicine

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Spinal compression fractures commonly occur at the thoracolumbar junction. We have previously constructed a 3-dimensional whole-spine model from medical images by using the finite element method (FEM) and then used this model to develop a compression fracture model. However, these models lacked the rib cage. No previous study has used whole-spine models including the rib cage constructed from medical images to analyze compression fractures. Therefore, in this study, we added the rib cage to whole-spine models. We constructed the models, including a normal spine model without the rib cage, a whole-spine model with the rib cage, and whole-spine models with compression fractures, using FEM analysis. Then, we simulated a person falling on the buttocks to perform stress analysis on the models and to examine to what extent the rib cage affects the analysis of compression fractures. The results showed that the intensity of strain and the vertebral body with minimum principle strain differed between the spine model including the rib cage and that excluding the rib cage. The strain on the spine model excluding the rib cage had approximately twice the intensity of the strain on the spine model including the rib cage. Therefore, the rib cage contributed to the stability of the thoracic spine, thus preventing deformation of the upper thoracic spine. However, the presence of the rib cage increased the strain around the site of compression fracture, thus increasing the possibilities of a refracture and fractures of adjacent vertebral bodies. Our study suggests that the analysis using spine models including the rib cage should be considered in future investigations of disorders of the spine and internal fracture fixation. The development of improved models may contribute to the improvement of prognosis and treatment of individual patients with disorders of the spine.

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“…Non-linear hyperelastic equations described the RoM much better than linear equations. 59 The ligaments have been modelled as both linear 32,51 and non-linear. [26][27][28]35,37,49 Naserkhaki et al 34 found a piecewise linear model from an in vivo dataset best predicted the mean in vitro rotations, and higher non-linearity caused greater movement of the instantaneous CoR .…”

Section: Boundary Conditionsmentioning

confidence: 99%

Computational modelling of the scoliotic spine: A literature review

Gould¹,

Cristofolini

Davico³

et al. 2021

Numer Methods Biomed Eng

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Scoliosis is a deformity of the spine that in severe cases requires surgical treatment. There is still disagreement among clinicians as to what the aim of such treatment is as well as the optimal surgical technique. Numerical models can aid clinical decision‐making by estimating the outcome of a given surgical intervention. This paper provided some background information on the modelling of the healthy spine and a review of the literature on scoliotic spine models, their validation, and their application. An overview of the methods and techniques used to construct scoliotic finite element and multibody models was given as well as the boundary conditions used in the simulations. The current limitations of the models were discussed as well as how such limitations are addressed in non‐scoliotic spine models. Finally, future directions for the numerical modelling of scoliosis were addressed.

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A comparative study on the mechanical behavior of intervertebral disc using hyperelastic finite element model

Abstract: Higher stress concentration resulted in more damage and ease of bringing out lumbar disc herniation. Numerical examples of FE simulation indicate that the FEM with hyperelastic constitutive model has very good capability for analyzing the mechanical behaviors of IVD.

Cited by 11 publications

References 24 publications

Finite element analysis of compression fractures at the thoracolumbar junction using models constructed from medical images

Finite element analysis of compression fractures at the thoracolumbar junction using models constructed from medical images

Finite Element Method Analysis of Compression Fractures on Whole-Spine Models Including the Rib Cage

Computational modelling of the scoliotic spine: A literature review

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