Biomechanical analysis of the lumbar spine on facet joint force and intradiscal pressure - A finite element study

Ching Sung Kuo, Hsuan-Teh Hu, Ruey Mo Lin, Kuo-Yuan Huang, Po Chun Lin, Zheng Cheng Zhong, Mu Lin Hseih

Research output: Contribution to journalArticle

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Abstract

Background: Finite element analysis results will show significant differences if the model used is performed under various material properties, geometries, loading modes or other conditions. This study adopted an FE model, taking into account the possible asymmetry inherently existing in the spine with respect to the sagittal plane, with a more geometrically realistic outline to analyze and compare the biomechanical behaviour of the lumbar spine with regard to the facet force and intradiscal pressure, which are associated with low back pain symptoms and other spinal disorders. Dealing carefully with the contact surfaces of the facet joints at various levels of the lumbar spine can potentially help us further ascertain physiological behaviour concerning the frictional effects of facet joints under separate loadings or the responses to the compressive loads in the discs. Methods: A lumbar spine model was constructed from processes including smoothing the bony outline of each scan image, stacking the boundary lines into a smooth surface model, and subsequent further processing in order to conform with the purpose of effective finite element analysis performance. For simplicity, most spinal components were modelled as isotropic and linear materials with the exception of spinal ligaments (bilinear). The contact behaviour of the facet joints and changes of the intradiscal pressure with different postures were analyzed. Results: The results revealed that asymmetric responses of the facet joint forces exist in various postures and that such effect is amplified with larger loadings. In axial rotation, the facet joint forces were relatively larger in the contralateral facet joints than in the ipsilateral ones at the same level. Although the effect of the preloads on facet joint forces was not apparent, intradiscal pressure did increase with preload, and its magnitude increased more markedly in flexion than in extension and axial rotation. Conclusions: Disc pressures showed a significant increase with preload and changed more noticeably in flexion than in extension or in axial rotation. Compared with the applied preloads, the postures played a more important role, especially in axial rotation; the facet joint forces were increased in the contralateral facet joints as compared to the ipsilateral ones at the same level of the lumbar spine.

Original languageEnglish
Article number151
JournalBMC Musculoskeletal Disorders
Volume11
DOIs
Publication statusPublished - 2010 Jul 7

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Zygapophyseal Joint
Spine
Pressure
Posture
Finite Element Analysis
Low Back Pain
Ligaments

All Science Journal Classification (ASJC) codes

  • Orthopedics and Sports Medicine
  • Rheumatology

Cite this

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title = "Biomechanical analysis of the lumbar spine on facet joint force and intradiscal pressure - A finite element study",
abstract = "Background: Finite element analysis results will show significant differences if the model used is performed under various material properties, geometries, loading modes or other conditions. This study adopted an FE model, taking into account the possible asymmetry inherently existing in the spine with respect to the sagittal plane, with a more geometrically realistic outline to analyze and compare the biomechanical behaviour of the lumbar spine with regard to the facet force and intradiscal pressure, which are associated with low back pain symptoms and other spinal disorders. Dealing carefully with the contact surfaces of the facet joints at various levels of the lumbar spine can potentially help us further ascertain physiological behaviour concerning the frictional effects of facet joints under separate loadings or the responses to the compressive loads in the discs. Methods: A lumbar spine model was constructed from processes including smoothing the bony outline of each scan image, stacking the boundary lines into a smooth surface model, and subsequent further processing in order to conform with the purpose of effective finite element analysis performance. For simplicity, most spinal components were modelled as isotropic and linear materials with the exception of spinal ligaments (bilinear). The contact behaviour of the facet joints and changes of the intradiscal pressure with different postures were analyzed. Results: The results revealed that asymmetric responses of the facet joint forces exist in various postures and that such effect is amplified with larger loadings. In axial rotation, the facet joint forces were relatively larger in the contralateral facet joints than in the ipsilateral ones at the same level. Although the effect of the preloads on facet joint forces was not apparent, intradiscal pressure did increase with preload, and its magnitude increased more markedly in flexion than in extension and axial rotation. Conclusions: Disc pressures showed a significant increase with preload and changed more noticeably in flexion than in extension or in axial rotation. Compared with the applied preloads, the postures played a more important role, especially in axial rotation; the facet joint forces were increased in the contralateral facet joints as compared to the ipsilateral ones at the same level of the lumbar spine.",
author = "Kuo, {Ching Sung} and Hsuan-Teh Hu and Lin, {Ruey Mo} and Kuo-Yuan Huang and Lin, {Po Chun} and Zhong, {Zheng Cheng} and Hseih, {Mu Lin}",
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Biomechanical analysis of the lumbar spine on facet joint force and intradiscal pressure - A finite element study. / Kuo, Ching Sung; Hu, Hsuan-Teh; Lin, Ruey Mo; Huang, Kuo-Yuan; Lin, Po Chun; Zhong, Zheng Cheng; Hseih, Mu Lin.

In: BMC Musculoskeletal Disorders, Vol. 11, 151, 07.07.2010.

Research output: Contribution to journalArticle

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AU - Kuo, Ching Sung

AU - Hu, Hsuan-Teh

AU - Lin, Ruey Mo

AU - Huang, Kuo-Yuan

AU - Lin, Po Chun

AU - Zhong, Zheng Cheng

AU - Hseih, Mu Lin

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