Removal of fixation construct could mitigate adjacent segment stress after lumbosacral fusion: A finite element analysis

Hsieh, Yueh Ying; Chen, Chia Hsien; Wu, Lien Chen; Lin, Shu; Chiang, Chang Jung

doi:10.1016/j.clinbiomech.2017.02.011

Cited by 42 publications

(60 citation statements)

References 24 publications

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“…Finally, we can only de ne the relative nucleus position as being 'slightly posterior' to the centre of the disc, such that the lowest ACC of our model was lower than 70%, which needs to be improved further, even though the model validation process was veri ed in our previously published studies. Therefore, the calibration of the relative nucleus position and the investigation of a reliable ratio to de ne the above indicators are vital for improving the ACC of FEA, a widely used research method in the investigation of pathogenesis of DDD and optimization of spine surgical methods [6,9,13,27,33].…”

Section: Discussionmentioning

confidence: 99%

“…The contact type of each surface, excluding facet cartilage, was de ned as bounded, and the cartilage-cartilage contact was de ned as frictionless [8,9,14,18,28,29]. Six degrees of freedom were rigidly xed under the inferior of L5, and moments were applied to the superior of L4 [6,12,16,21].…”

Section: Boundary and Loading Conditionsmentioning

confidence: 99%

“…Biomechanical deterioration is a key trigger for lumbar disc degenerative diseases (DDDs) [1][2][3][4][5]. Therefore, optimized nite element analysis (FEA), which is a widely used biomechanical research method, is an ideal approach for the accurate investigation of DDD pathogenesis and treatments [6][7][8][9][10][11][12][13][14][15]. A series of model validation methods have been implemented by comparing the differences in the range of motion (ROM), which is a key index for lumbar motility and stability, between the FEA results and those from widely cited in vitro studies [7,10,11,[14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Measurement and calibration of the nucleus position and its cross-sectional area ratio to increase the accuracy of finite element analysis

Xi¹,

Zhang²,

Sun³

et al. 2020

Preprint

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Background: As a widely used biomechanical research method, finite element analysis (FEA) is an important tool for investigating the pathogenesis of disc degenerative diseases and optimizing spine surgical methods. However, the definitions of the relative nucleus position and its cross-sectional area ratio do not conform to a uniform standard, thus affecting the accuracy (ACC) of the FEA. Hence, this study aimed to determine a precise definition of the relative nucleus position and its cross-sectional area ratio to increase the ACC of the following FEA studies. Methods: The lumbar relative nucleus position and its cross-sectional area ratio were measured from magnetic resonance imaging data and then calibrated and validated via FEA. Imaging data from patients without disc degeneration were used. The L4-L5 nucleus and disc cross-sectional areas and the distances between the edges of the annulus and nucleus were measured; the ratios between these values were calculated as P1 and P2, respectively. The FEA model was constructed using these measured values, and the relative nucleus position was calibrated by estimating the differences in the range of motion (ROM) between the model, wherein the ligaments, facet joints and nucleus were suppressed, and that of an in vitro study. Then, the ACC was re-estimated in the model with all non-bony structures by comparing the ROM, the intradiscal pressure (IDP), the facet contact force (FCF) and the disc compression (DC) under different sizes and directions of moments magnitudes to validate the measured and calibrated indicators. Results: The interobserver homogeneity was acceptable, and the measured P1 and P2 values were 1.22 and 38%, respectively. Furthermore, an ACC of up to 99% was attained for the model under flexion–extension conditions when the calibrated P1 value (1.62) was used, with a model validation of greater than 90% attained under al most all of the loading conditions considering the different indicators and moment magnitude s. Conclusion: The measured and calibrated relative nucleus position and its cross-sectional area ratio increase the ACC of the FEA model and can therefore be used in subsequent studies.

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Section: Discussionmentioning

confidence: 99%

Section: Boundary and Loading Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measurement and calibration of the nucleus position and its cross-sectional area ratio to increase the accuracy of finite element analysis

Xi¹,

Zhang²,

Sun³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…Construction of the normal model Bone structures from L1 to S1 were reconstructed on the basis of the high-resolution computed tomography (CT) imaging data and were used as templates for model construction [4,9,10]. Fitted curves were used in the drawing of smooth surfaces to replace irregular surfaces in the reconstructed model.…”

Section: Calibration and Validation Of The Fea Modelmentioning

confidence: 99%

“…Therefore, optimized nite element analysis (FEA), which is a widely used biomechanical research method, is an ideal approach for the accurate investigation of DDD pathogenesis and treatments [4][5][6][7][8][9]. A series of model validation methods have been implemented by comparing the differences in the range of motion (ROM), which is a key index for lumbar motility and stability, between the FEA results and those from widely cited in vitro studies [5,6,[9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Measurement and calibration of the nucleus position and its cross-sectional area ratio to increase the accuracy of finite element analysis

Zhang

et al. 2020

Preprint

View full text Add to dashboard Cite

Backgrounds: As a widely used biomechanical research method, finite element analysis (FEA) is an important tool for investigating the pathogenesis of disc degenerative diseases and optimizing spine surgical methods. However, the definitions of the relative nucleus position and its cross-sectional area ratio do not conform to a uniform standard, thus affecting the accuracy (ACC) of the FEA.Objectives: This study aimed to determine a precise definition of the relative nucleus position and its cross-sectional area ratio to increase the ACC of the following FEA studies.Methods: The lumbar relative nucleus position and its cross-sectional area ratio were measured from magnetic resonance imaging data and then calibrated and validated via FEA. Imaging data from patients without disc degeneration were used. The L4-L5 nucleus and disc cross-sectional areas and the distances between the edges of the annulus and nucleus were measured; the ratios between these values were calculated as P1 and P2, respectively. The FEA model was constructed using these measured values, and the relative nucleus position was calibrated by estimating the differences in the range of motion (ROM) between the model, wherein the ligaments, facet joints and nucleus were suppressed, and that of an in vitro study. Then, the ACC was re-estimated in the model with all non-bony structures by comparing the ROM, the intradiscal pressure (IDP), the facet contact force (FCF) and the disc compression (DC) under different sizes and directions of moments magnitudes to validate the measured and calibrated indicators.Results: The interobserver homogeneity was acceptable, and the measured P1 and P2 values were 1.22 and 38%, respectively. Furthermore, an ACC of up to 99% was attained for the model under flexion–extension conditions when the calibrated P1 value (1.62) was used, with a model validation of greater than 90% attained under almost all of the loading conditions considering the different indicators and moment magnitudes.Conclusions: The measured and calibrated relative nucleus position and its cross-sectional area ratio increase the ACC of the FEA model and can therefore be used in subsequent studies.

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Risk factors for mechanical complications after fusion extension surgery for lumbar adjacent segment disease

Kim

Ahn

et al. 2023

Eur Spine J

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Removal of fixation construct could mitigate adjacent segment stress after lumbosacral fusion: A finite element analysis

Cited by 42 publications

References 24 publications

Measurement and calibration of the nucleus position and its cross-sectional area ratio to increase the accuracy of finite element analysis

Measurement and calibration of the nucleus position and its cross-sectional area ratio to increase the accuracy of finite element analysis

Measurement and calibration of the nucleus position and its cross-sectional area ratio to increase the accuracy of finite element analysis

Risk factors for mechanical complications after fusion extension surgery for lumbar adjacent segment disease

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