Sensitivity of lumbar spine loading to anatomical parameters

Putzer, Michael; Ehrlich, Ingo; Rasmussen, John; Gebbeken, Norbert; Dendorfer, Sebastian

doi:10.1016/j.jbiomech.2015.11.003

Cited by 32 publications

(17 citation statements)

References 23 publications

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“…Fifthly, the data presented in this work was obtained by using a subject-specific model of the spine where anatomical variations in spinal geometry and muscle morphology were not accounted for. Previous studies found that the spinal curvature had a major influence on calculated internal loads (Briggs et al 2007;Putzer, Ehrlich, et al 2016;Bruno et al 2017). Briggs et al (2007) reported strong correlations between thoracic spine curvature and the vertebral loads and thoracic curvature and muscle forces.…”

Section: Discussionmentioning

confidence: 96%

“…They concluded that there were significant effects on disc and muscle forces and that these increased with trunk flexion. Putzer, Ehrlich, et al (2016) found that anatomical variations of vertebral body height, disc height, transverse process width, and the curvature of the lumbar spine greatly influenced the joint force predictions at the L4/L5 disc. Recently, found that modeling the thorax as a single lumped rigid body instead of a flexible structure resulted in moderately lower compressive disc forces but significantly changed muscle forces.…”

Section: Discussionmentioning

confidence: 97%

“…Previously, several authors investigated the sensitivity of their models against the locations of intervertebral center of rotation (Zander et al 2016), spine rhythms and abdominal pressure (Arshad et al 2016), ligament stiffness (Putzer, Auer, et al 2016), and vertebral morphology (Putzer, Ehrlich, et al 2016). Muscle recruitment during trunk exertions is dependent on muscle lines-of-action, however, there is only one study which aimed to investigate the sensitivity of muscle and intervertebral disc force computations against muscle attachment sites in the spine.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sensitivity of muscle and intervertebral disc force computations to variations in muscle attachment sites

Bayoğlu

Güldeniz

Koopman

et al. 2019

Computer Methods in Biomechanics and Biomedical Engineering

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The current paper aims at assessing the sensitivity of muscle and intervertebral disc force computations against potential errors in modeling muscle attachment sites. We perturbed each attachment location in a complete and coherent musculoskeletal model of the human spine and quantified the changes in muscle and disc forces during standing upright, flexion, lateral bending, and axial rotation of the trunk. Although the majority of the muscles caused minor changes (less than 5%) in the disc forces, certain muscle groups, for example, quadratus lumborum, altered the shear and compressive forces as high as 353% and 17%, respectively. Furthermore, percent changes were higher in the shear forces than in the compressive forces. Our analyses identified certain muscles in the rib cage (intercostales interni and intercostales externi) and lumbar spine (quadratus lumborum and longissimus thoracis) as being more influential for computing muscle and disc forces. Furthermore, the disc forces at the L4/L5 joint were the most sensitive against muscle attachment sites, followed by T6/T7 and T12/L1 joints. Presented findings suggest that modeling muscle attachment sites based on solely anatomical illustrations might lead to erroneous evaluation of internal forces and promote using anatomical datasets where these locations were accurately measured. When developing a personalized model of the spine, certain care should also be paid especially for the muscles indicated in this work.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sensitivity of muscle and intervertebral disc force computations to variations in muscle attachment sites

Bayoğlu

Güldeniz

Koopman

et al. 2019

Computer Methods in Biomechanics and Biomedical Engineering

View full text Add to dashboard Cite

show abstract

“…Torsion simulation showed large shearing in the annulus periphery, suggesting a main load carrier upon removal of posterior elements, as previously suggested by Refs. [7,14,27]. These findings are relevant because stress and strain concentration sites are source of disc injury and failure, more often in combine loading, such as bending and torsion.…”

Section: Fe Sim Loadsmentioning

confidence: 98%

Flexibility of the Lumbar Intervertebral Disc in Bending and Torsion: Experimental and Finite Element Study

Gutiérrez¹,

Alonso²,

Armenta³

2017

JMEA

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Abstract:Intervertebral disc flexibility is influenced by lifestyle, loading history, trauma, preexisting conditions, age and degeneration. With regard to degeneration, intervertebral discs become less flexible and stiffer. In this study, a testing protocol using bending and torsion loading was developed to gain the flexibility curves and stiffness of ten cadaveric lumbar discs. Measurements of rotation in the sagittal plane (flexion-extension), coronal plane (right-left lateral bending) and transverse plane (torsion) due to a 5 N-m load are reported. Results show that overall normal discs are more flexible and behave in a nonlinear fashion. The testing results were used in a develop finite element model of an intervertebral disc to investigate the stresses and strains in the disc components: annulus fibrosus and nucleus pulposus with regard to degeneration. Simulation of bending and torsion loadings show large strains in the annulus and nucleus from a normal disc, in contrast higher stresses develop in the annulus from a degenerated disc. The proposed methodology is novel, versatile, functional and economic with implications in bioengineering, medical sciences and the clinical field.

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“…the AnyBody Modelling System (Anybody Technology A/S, Aalborg, Denmark). The AnyBody Modelling System has been used for injury prevention purposes, where joint reactions have been studied in for example lifting, 14,15 wheelchair propulsion 16 and in volley-ball. 17 Validation studies of simulated compression forces between vertebrae L4 and L5 show good agreement to measured reactions.…”

Section: Introductionmentioning

confidence: 99%

Shoulder and Lower Back Joint Reaction Forces in Seated Double Poling

Ohlsson

Danvind

Holmberg

2018

Journal of Applied Biomechanics

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Overuse injuries in the shoulders and lower back are hypothesized to be common in cross-country sit-skiing. Athletes with reduced trunk muscle control mainly sit with the knees higher than the hips (KH). To reduce spinal flexion, a position with the knees below the hips (KL) was enabled for these athletes using a frontal trunk support. The aim of the study was to compare the shoulder joint (glenohumeral joint) and L4-L5 joint reactions of the KL and KH sitting positions. Five able-bodied female athletes performed submaximal and maximal exercise tests in the sitting positions KL and KH on a ski ergometer. Measured pole forces and 3-dimensional kinematics served as input for inverse-dynamics simulations to compute the muscle forces and joint reactions in the shoulder and L4-L5 joint. This was the first musculoskeletal simulation study of seated double poling. The results showed that the KH position was favorable for higher performance and decreased values of the shoulder joint reactions for female able-bodied athletes with full trunk control. The KL position was favorable for lower L4-L5 joint reactions and might therefore reduce the risk of lower back injuries. These results indicate that it is hard to optimize both performance and safety in the same sit-ski.

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Sensitivity of lumbar spine loading to anatomical parameters

Cited by 32 publications

References 23 publications

Sensitivity of muscle and intervertebral disc force computations to variations in muscle attachment sites

Sensitivity of muscle and intervertebral disc force computations to variations in muscle attachment sites

Flexibility of the Lumbar Intervertebral Disc in Bending and Torsion: Experimental and Finite Element Study

Shoulder and Lower Back Joint Reaction Forces in Seated Double Poling

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