On the load-sharing along the ligamentous lumbosacral spine in flexed and extended postures: Finite element study

Naserkhaki, Sadegh; Jaremko, Jacob L.; Adeeb, Samer; El‐Rich, Marwan

doi:10.1016/j.jbiomech.2015.09.050

Cited by 53 publications

(26 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, degenerated discs develop higher stresses while normal discs develop higher strains. Bending simulation shows that flexion, extension, right and left lateral loading causes convex and concave curvature in the disc, which implies combine tensile and compression stresses and higher strains which occurred in the disc posterior side, as reported elsewhere [24][25][26]. Torsion simulation showed large shearing in the annulus periphery, suggesting a main load carrier upon removal of posterior elements, as previously suggested by Refs.…”

Section: Fe Sim Loadssupporting

confidence: 81%

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

Gutiérrez¹,

Alonso²,

Armenta³

2017

JMEA

View full text Add to dashboard Cite

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.

show abstract

Section: Fe Sim Loadssupporting

confidence: 81%

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

Gutiérrez¹,

Alonso²,

Armenta³

2017

JMEA

View full text Add to dashboard Cite

show abstract

“…The IDP was calculated by averaging the pressure in all elements of nucleus (Naserkhaki et al, 2016;Liu et al, 2018) and exhibited the same pattern at all lumbar levels (L1-5) with or without accounting for the IAP (Figure 6). On the other hand, a noticeable decrease in the IDP was observed in the presence of IAP at all levels except the L5-S1 level.…”

Section: Idpmentioning

confidence: 99%

Numerical Investigation of Intra-abdominal Pressure Effects on Spinal Loads and Load-Sharing in Forward Flexion

Liu

Khalaf

Adeeb

et al. 2019

Front. Bioeng. Biotechnol.

Self Cite

View full text Add to dashboard Cite

The intra-abdominal pressure (IAP), which generates extensor torque and unloads the spine, is often neglected in most of the numerical studies that use musculoskeletal (MSK) or finite element (FE) spine models. Hence, the spinal loads predicted by these models may not be realistic. In this work, we quantified the effects of IAP variation in forward flexion on spinal loads and load-sharing using a novel computational tool that combines a MSK model of the trunk with a FE model of the ligamentous lumbosacral spine. The MSK model predicted the trunk muscle and reaction forces at the T12-L1 junction, with or without the IAP, which served as input in the FE model to investigate the effects of IAP on spinal loads and load-sharing. The findings confirm the unloading role of the IAP, especially at large flexion angles. Inclusion of the IAP reduced global muscle forces and disc loads, as well as the intradiscal pressure (IDP). The reduction in disc loads was compensated for by an increase in ligament forces. The IDP, as well as the strain of the annular fibers were more sensitive to the IAP at the upper levels of the spine. Including the IAP also increased the ligaments' load-sharing which reduced the role of the disc in resisting internal forces. These results are valuable for more accurate spinal computational studies, particularly toward clinical applications as well as the design of disc implants.

show abstract

“…Friction model Pressure-overclosure information Azari et al (2018) Frictionless Initial joint space of 0.6 mm Frictionless Initial joint space as per CT; linear formulation Cao et al (2020) Initial joint space of 0.5 mm Chen et al (2002) Initial joint space of 1 mm Chen et al (2009) Friction coefficient of 0.1 Initial joint space of 0.5 mm Du et al (2016b) Frictionless Initial joint space of 0.5 mm Galbusera et al (2008) Frictionless Goel et al (1988) Frictionless Initial joint space of 0.45 mm Guo et al (2007) Frictionless Guo and Li (2020) Frictionless Initial joint space of 0.5 mm Khoddam-Khorasani et al 2018Max gap of 1.25 mm Kim et al (2012) Exponential formulation Kim et al (2017) Frictionless Exponential formulation Kong et al (1998) Initial joint space of 1.25 mm, contact initiated at gap of 0.75 mm, exponential formulation, pressure at zero gap of 35 GPa Liu et al 2011Friction coefficient of 0.1 Initial joint space of 0.5 mm Liu et al 2018Frictionless Max gap of 1.5 mm Liu et al (2020) Frictionless Initial joint space of 0.5 mm Mustafy et al (2014) Frictionless Naserkhaki et al (2016) Frictionless Max gap of 2 mm Niemeyer et al (2012) Frictionless Initial joint space of 0.01 mm to 0.4 mm (uniform probability distribution), contact initiated for overclosure of 0.01 to 0.3 mm (uniform probability distribution), exponential formulation, pressure at zero gap of 170 MPa Nikkhoo et al 2019Frictionless Initial joint space of 0.3 mm, exponential formulation Nikkhoo et al (2020) Frictionless Initial joint space of 0.5 mm, contact initiated at gap of 0.5 mm, exponential formulation, pressure at zero gap of 120 MPa Rohlmann et al (2006b) Initial joint space of 0.5 mm, gap/pressure curve with a pressure at zero gap of 12 GPa Rundell et al 2011Frictionless Sharma et al (1995) Initial joint space of 0.6 mm, contact initiated at gap of 0.4 mm, gap/pressure curve with a pressure at zero gap of 12 GPa Shen et al 2019Frictionless Shirazi-Adl et al 1986Frictionless Shirazi-Adl and Drouin (1987) Frictionless Initial joint space of 1 mm, max overclosure 0.5 mm Shirazi-Adl (1994) Frictionless Contact initiated at overclosu...…”

Section: Referencesmentioning

confidence: 99%

Biomechanical modelling of the facet joints: a review of methods and validation processes in finite element analysis

Mengoni

2020

Biomech Model Mechanobiol

View full text Add to dashboard Cite

There is an increased interest in studying the biomechanics of the facet joints. For in silico studies, it is therefore important to understand the level of reliability of models for outputs of interest related to the facet joints. In this work, a systematic review of finite element models of multi-level spinal section with facet joints output of interest was performed. The review focused on the methodology used to model the facet joints and its associated validation. From the 110 papers analysed, 18 presented some validation of the facet joints outputs. Validation was done by comparing outputs to literature data, either computational or experimental values; with the major drawback that, when comparing to computational values, the baseline data was rarely validated. Analysis of the modelling methodology showed that there seems to be a compromise made between accuracy of the geometry and nonlinearity of the cartilage behaviour in compression. Most models either used a soft contact representation of the cartilage layer at the joint or included a cartilage layer which was linear elastic. Most concerning, soft contact models usually did not contain much information on the pressure-overclosure law. This review shows that to increase the reliability of in silico model of the spine for facet joints outputs, more needs to be done regarding the description of the methods used to model the facet joints, and the validation for specific outputs of interest needs to be more thorough, with recommendation to systematically share input and output data of validation studies.

show abstract

On the load-sharing along the ligamentous lumbosacral spine in flexed and extended postures: Finite element study

Cited by 53 publications

References 50 publications

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

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

Numerical Investigation of Intra-abdominal Pressure Effects on Spinal Loads and Load-Sharing in Forward Flexion

Biomechanical modelling of the facet joints: a review of methods and validation processes in finite element analysis

Contact Info

Product

Resources

About