Effects of inter-individual lumbar spine geometry variation on load-sharing: Geometrically personalized Finite Element study

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

doi:10.1016/j.jbiomech.2016.06.032

Cited by 51 publications

(23 citation statements)

References 47 publications

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“…Figure 4 (upper left), Wood et al (1996), and Meakin et al (2009). Contrary to existing literature on the influence of curvature on spinal loading (Briggs et al, 2007;Bruno et al, 2012Bruno et al, , 2017Galbusera et al, 2014;Naserkhaki et al, 2016), the novelty of our study lies in the formulation of quantitative statements regarding the LL-dependent load distribution during forward dynamic simulations, e.g., "Per one degree increase in LL, the compressive force within the IVD between L5 and SA decreases by 2.8 N (CI: [−4.6, −1] N)." Of course, our absolute output values have to be treated with caution when comparing them directly to in vivo (or more elaborated in silico) situations.…”

Section: Discussionmentioning

confidence: 93%

“…On average, an increase of one degree LL was associated with an increase of ~0.74° in PI and 0.62° in SS, which well corresponds to literature data—cf. Roussouly et al ( 2005 , Tables 1, 2) and Naserkhaki et al ( 2016 , Figure 1). For ΔPILL, we found a decrease of 0.26° per degree LL, which has, to our knowledge, not yet been reported.…”

Section: Model and Methodsmentioning

confidence: 90%

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Load Distribution in the Lumbar Spine During Modeled Compression Depends on Lordosis

Müller

Rockenfeller

Damm

et al. 2021

Front. Bioeng. Biotechnol.

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Excessive or incorrect loading of lumbar spinal structures is commonly assumed as one of the factors to accelerate degenerative processes, which may lead to lower back pain. Accordingly, the mechanics of the spine under medical conditions, such as scoliosis or spondylolisthesis, is well-investigated. Treatments via both conventional therapy and surgical methods alike aim at restoring a “healthy” (or at least pain-free) load distribution. Yet, surprisingly little is known about the inter-subject variability of load bearings within a “healthy” lumbar spine. Hence, we utilized computer tomography data from 28 trauma-room patients, whose lumbar spines showed no visible sign of degeneration, to construct simplified multi-body simulation models. The subject-specific geometries, measured by the corresponding lumbar lordosis (LL) between the endplates of vertebra L1 and the sacrum, served as ceteris paribus condition in a standardized forward dynamic compression procedure. Further, the influence of stimulating muscles from the M. multifidus group was assessed. For the range of available LL from 28 to 66°, changes in compressive and shear forces, bending moments, as well as facet joint forces between adjacent vertebrae were calculated. While compressive forces tended to decrease with increasing LL, facet forces were tendentiously increasing. Shear forces decreased between more cranial vertebrae and increased between more caudal ones, while bending moments remained constant. Our results suggest that there exist significant, LL-dependent variations in the loading of “healthy” spinal structures, which should be considered when striving for individually appropriate therapeutic measures.

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Section: Discussionmentioning

confidence: 93%

Section: Model and Methodsmentioning

confidence: 90%

Load Distribution in the Lumbar Spine During Modeled Compression Depends on Lordosis

Müller

Rockenfeller

Damm

et al. 2021

Front. Bioeng. Biotechnol.

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“…e size of the intervertebral foramen is closely related to the normal physiological morphology of spinal nerves and blood vessels, and some studies have shown that intervertebral disc degeneration is closely related to the height and area of the intervertebral foramen [19][20][21][22]. In this study, we analyzed the stress changes of the degenerative L4-5 intervertebral disc during pushing to a height of 0-10 cm and also analyzed the height and area of intervertebral foramen in these biomechanical environments.…”

Section: Discussionmentioning

confidence: 99%

Three-Dimensional Finite Element Analysis of L4-5 Degenerative Lumbar Disc Traction under Different Pushing Heights

Ding

Liao

Yan

et al. 2021

Journal of Healthcare Engineering

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Objective. To study and analyze the changes of intervertebral foramen height and area of the degenerative L4-5 intervertebral disc under different pushing heights by the finite element method. Methods. CT and MRI images of T12-S1 segments were obtained from a healthy volunteer who met the inclusion criteria. A DR machine was used to capture images of the lumbar lateral section before and after simultaneous pushing of the L4 and L5 spinous processes by manipulation called Daogaijinbei, and the measurement showed that the displacement changes of L4 and L5 were both approximately 10 cm, so the pushing height was set at 0–10 cm. A three-dimensional finite element model of the entire normal lumbar spine was established using Mimics 16.0, Geomagic Studio 2014, Hypermesh 13.0, MSC.Patran 2012, and so on. The disc height and nucleus area of the lumbar disc of the normal entire lumbar disc model were adjusted to establish models of the L4-5 disc with mild, moderate, and severe degeneration. Changes of disc height and area of the L4-5 degenerative intervertebral disc under different pushing heights were calculated. Results. The size of the L4-5 intervertebral foramen was analyzed from the height and area of the intervertebral foramen, and the results showed the following: (1) as for the normal lumbar disc and a lumbar of the L4-5 disc with mild and moderate degeneration, the height of the L4-5 intervertebral foramen and its area both increased during pushing between 0 and 8 cm. After the pushing height reached 8 cm, the height and area of the L4-5 intervertebral foramen gradually became stable; (2) as for the L4-5 disc with severe degeneration, during the process of pushing, the height and area of the L4-5 intervertebral foramen increased slightly, but this change was not obvious. Conclusions. After the spinal manipulation, the sizes of the L4-5 intervertebral foramen of the L4-5 disc with mild and moderate degeneration were significantly larger than those before pushing; in contrast, the size of L4-5 intervertebral foramen of the L4-5 disc with severe lumbar degeneration was not significantly changed.

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“…This study examined the immediate effect of prolonged deep squatting on the lumbopelvic kinematics and muscle recruitment using the simulated deep squatting position, in which stress to lower limbs was reduced by having to support their body weight over their buttocks. A previous study suggested that curvature of the spine would alter both the location and magnitude of load on the spinal tissues [ 28 ]. Therefore, variation of the spinal curvature during deep squatting position in this study, if present, would have influenced the load sharing within the spinal tissues.…”

Section: Discussionmentioning

confidence: 99%

Changes in Lumbopelvic Movement and Muscle Recruitment Associated with Prolonged Deep Squatting: A Pilot Study

Lui

Tsang

Kwok

2018

IJERPH

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This study examined the changes in spinal kinematics and muscle recruitment of the lumbopelvic region associated with prolonged squatting. Eight subjects with chronic nonspecific low back pain (LBP) and eight asymptomatic subjects (AS) performed squat-to-stand and reverse movements, before and immediately after 15 min deep-squatting. Within-group and between-group differences in lumbopelvic kinematics and electromyographic activity acquired in lumbar erector spinae (ES), gluteus maximus (GM), and vastus lateralis (VL) were analyzed. During squat-to-stand after squatting, the LBP group showed slower then faster lumbar movement in the second and third quartiles, respectively. In the second quartile, the AS group moved with a significantly greater lumbar angle. However, significantly greater bilateral GM activity (+4–4.5%) was found in the LBP group only. A more profound decrease in bilateral ES activity (−10%) was also shown in the LBP group, yet this was nonsignificant compared to the AS group (−4%). In the third quartile, only the LBP group moved with a significantly greater lumbar angle, together with a significant increase in bilateral ES (+6–8%) and GM muscle (+2–3%) activity. The findings of the altered pattern of joint kinematics and recruitment of the key lumbopelvic muscles displayed in the LBP group inform on the possible mechanisms that may contribute to the increased risk of developing lumbar dysfunctions for people who work in prolonged squatting postures.

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Effects of inter-individual lumbar spine geometry variation on load-sharing: Geometrically personalized Finite Element study

Cited by 51 publications

References 47 publications

Load Distribution in the Lumbar Spine During Modeled Compression Depends on Lordosis

Load Distribution in the Lumbar Spine During Modeled Compression Depends on Lordosis

Three-Dimensional Finite Element Analysis of L4-5 Degenerative Lumbar Disc Traction under Different Pushing Heights

Changes in Lumbopelvic Movement and Muscle Recruitment Associated with Prolonged Deep Squatting: A Pilot Study

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