Human Lumbar Spine Injury Risk in Dynamic Combined Compression and Flexion Loading

Tushak, Sophia; Gepner, Bronisław; Forman, Jason; Hallman, Jason J.; Pipkorn, Bengt; Kerrigan, Jason

doi:10.1007/s10439-022-03126-5

Cited by 4 publications

(2 citation statements)

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“…A comprehensive analysis of the range of motion of the model in the sub-injurious range is an important first step in the validation of the model that may be used in crash analysis. However, it would be necessary to examine the model in conditions similar to those of a road accident, namely high strain rates, compression force, and moments ( Minster, Lafon & Beillas, 2023 ; Yoganandan et al, 2023 ; Tushak et al, 2022 ; Tushak et al, 2023 ). The current validation set is not sufficient to fully evaluate the model’s ability to accurately predict the outcomes of a car crash.…”

Section: Discussionmentioning

confidence: 99%

“…In order to achieve this goal nonlinear orthotropic material model was used for ligaments and modifications were introduced to the models of intervertebral discs to better reflect their anatomical structure and properties. Material parameters were taken from the literature and calibrated with respect to experimental flexion and compression tests, as they are of key importance in the analysis of road accidents ( Richards et al, 2006 ; Ivancic, 2013 ; Pachocki et al, 2021 ; Tushak et al, 2023 ). In the present study, the set of validation tests were extended in relation the THUMS documentation ( Toyota Motor Corporation & Toyota Central R and D Labs.…”

Section: Introductionmentioning

confidence: 99%

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Development and validation of lumbar spine finite element model

Wiczenbach

Pachocki

Daszkiewicz

et al. 2023

PeerJ

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The functional biomechanics of the lumbar spine have been better understood by finite element method (FEM) simulations. However, there are still areas where the behavior of soft tissues can be better modeled or described in a different way. The purpose of this research is to develop and validate a lumbar spine section intended for biomechanical research. A FE model of the 50th percentile adult male (AM) Total Human Model for Safety (THUMS) v6.1 was used to implement the modifications. The main modifications were to apply orthotropic material properties and nonlinear stress-strain behavior for ligaments, hyperelastic material properties for annulus fibrosus and nucleus pulposus, and the specific content of collagenous fibers in the annulus fibrosus ground substance. Additionally, a separation of the nucleus pulposus from surrounding bones and tissues was implemented. The FE model was subjected to different loading modes, in which intervertebral rotations and disc pressures were calculated. Loading modes contained different forces and moments acting on the lumbar section: axial forces (compression and tension), shear forces, pure moments, and combined loading modes of axial forces and pure moments. The obtained ranges of motion from the modified numerical model agreed with experimental data for all loading modes. Moreover, intradiscal pressure validation for the modified model presented a good agreement with the data available from the literature. This study demonstrated the modifications of the THUMS v6.1 model and validated the obtained numerical results with existing literature in the sub-injurious range. By applying the proposed changes, it is possible to better model the behavior of the human lumbar section under various loads and moments.

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