Load-sharing in the lumbosacral spine in neutral standing &amp; flexed postures – A combined finite element and inverse static study

Liu, Tao; Khalaf, Kinda; Naserkhaki, Sadegh; El‐Rich, Marwan

doi:10.1016/j.jbiomech.2017.10.033

Cited by 31 publications

(37 citation statements)

References 37 publications

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“…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%

“…The model is composed of the skull, cervical region, upper arms, rigid thorax (T1-T12 as a single segment) and five rigid lumbar vertebrae (L1-L5) together with the pelvis and sacrum. The Anterior Longitudinal Ligament (ALL), Posterior Longitudinal Ligament (PLL), Intertransverse Ligament (ITL), Ligamentum Flavum (LF), Supraspinous Ligament (SSL), and Interspinous Ligament (ISL) and Capsular Ligament (CL) were all incorporated in the model and modified to match the corresponding properties in our validated published FE model (Liu et al, 2018). The ligament forces were set to zero in the neutral standing position.…”

Section: Musculoskeletal Modelmentioning

confidence: 99%

“…The current research, thus, aims to first delineate the modeling of the IAP in a MSK model, and secondly to quantify the effects of the IAP on muscle forces, IDP, and spinal load-sharing in the lumbosacral spine during forward flexion. This is accomplished using our combined MSK and FE modeling methodology, previously validated and published (Liu et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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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.

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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.

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Section: Idpmentioning

confidence: 99%

Section: Musculoskeletal Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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.

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“…Estimation of the trunk muscle forces is however a prerequisite to the determination of global and internal joint loads during in vivo activities. Similar attempts have recently been reported by others as well …”

Section: Introductionmentioning

confidence: 99%

“…Similar attempts have recently been reported by others as well. 9 Due to advances in the medical imaging techniques and improvements in their accuracy, an alternative approach is instead to drive the detailed spine models by the image-based in vivo displacements. This technique constitutes hence a displacement-control loading that has also been used elsewhere.…”

mentioning

confidence: 99%

Subject‐specific loads on the lumbar spine in detailed finite element models scaled geometrically and kinematic‐driven by radiography images

Dehghan-Hamani

Arjmand

Shirazi‐Adl

2019

Numer Methods Biomed Eng

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Traditional load‐control musculoskeletal and finite element (FE) models of the spine fail to accurately predict in vivo intervertebral joint loads due mainly to the simplifications and assumptions when estimating redundant trunk muscle forces. An alternative powerful protocol that bypasses the calculation of muscle forces is to drive the detailed FE models by image‐based in vivo displacements. Development of subject‐specific models, however, both involves the risk of extensive radiation exposures while imaging in supine and upright postures and is time consuming in terms of the reconstruction of the vertebrae, discs, ligaments, and facets geometries. This study therefore aimed to introduce a remedy for the development of subject‐specific FE models by scaling the geometry of an existing detailed FE model of the T12‐S1 lumbar spine. Five subject‐specific scaled models were driven by their own radiography image‐based displacements in order to predict joint loads, ligament forces, facet joint forces, and disc fiber strains during relaxed upright as well as moderate flexion and extension tasks. The predicted intradiscal pressures were found in adequate agreement with in vivo data for upright, flexion, and extension tasks. There were however large intersubject variations in the estimated joint loads and facet forces.

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Development of a multiscale model of the human lumbar spine for investigation of tissue loads in people with and without a transtibial amputation during sit-to-stand

Honegger

Actis

Gates

et al. 2020

Biomech Model Mechanobiol

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Load-sharing in the lumbosacral spine in neutral standing & flexed postures – A combined finite element and inverse static study

Cited by 31 publications

References 37 publications

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

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

Subject‐specific loads on the lumbar spine in detailed finite element models scaled geometrically and kinematic‐driven by radiography images

Development of a multiscale model of the human lumbar spine for investigation of tissue loads in people with and without a transtibial amputation during sit-to-stand

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