The Effect of Posture on the Fluid Content of Lumbar Intervertebral Discs

Adams, Michael A.; Hutton, W. C.

doi:10.1097/00007632-198309000-00013

Cited by 224 publications

(120 citation statements)

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“…The transverse stability of a motion segment will most likely not change significantly due to a vertebroplasty, because the procedure only induces material changes in the augmented vertebra. Furthermore, the spinal posterior elements were not included in this FE model, mainly because their contributions to the load bearing in a motion segment under compression are small, with the external compression forces being primarily transmitted by the intervertebral disc [1,15,19].…”

Section: Discussionmentioning

confidence: 99%

Load shift of the intervertebral disc after a vertebroplasty: a finite-element study

Baroud

Nemes

Heini

et al. 2003

European Spine Journal

275

218

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Section: Discussionmentioning

confidence: 99%

Load shift of the intervertebral disc after a vertebroplasty: a finite-element study

Baroud

Nemes

Heini

et al. 2003

European Spine Journal

275

218

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“…Due to this fluid exchange, the IVD exhibits the creep and relaxation behavior under sustained loads typical of a damper, i.e. when subjected to the body weight for 4 h, a lumbar IVD expels 10-15 % of its water content through the endplates [1].…”

Section: Functional Anatomy Of the Intervertebral Discmentioning

confidence: 99%

Ageing and degenerative changes of the intervertebral disc and their impact on spinal flexibility

et al. 2014

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Purpose Degeneration of the intervertebral disc is associated with various morphological changes of the disc itself and of the adjacent structures, such as reduction of the water content, collapse of the intervertebral space, disruption and tears, and osteophytes. These morphological changes of the disc are linked to alterations of the spine flexibility. This paper aims to review the literature about the ageing and degenerative changes of the intervertebral disc and their link with alterations in spinal biomechanics, with emphasis on flexibility. Methods Narrative literature review. Results Clinical instability of the motion segment, usually related to increased flexibility and hypothesized to be connected to early, mild disc degeneration and believed to be responsible for low back pain, was tested in numerous in vitro studies. Despite some disagreement in the findings, a trend toward spinal stiffening with the increasing degeneration was observed in most studies. Tests about tears and fissures showed inconsistent results, as well as for disc collapse and dehydration. Vertebral osteophytes were found to be effective in stabilizing the spine in bending motions. Conclusions The literature suggests that the degenerative changes of the intervertebral disc and surrounding structures lead to subtle alteration of the mechanical properties of the functional spinal unit. A trend toward spinal stiffening with the increasing degeneration has been observed in most studies.

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“…These losses are predominantly a result of height reductions in the intervertebral discs. This occurs through lateral bulging of the annulus fibrosus, contributing to the initial rapid height losses [12] and subsequent fluid loss from the nucleus pulposis [17,18], contributing to the later, slower height reductions [12].…”

Section: Introductionmentioning

confidence: 99%

The effects of upper limb loading on spinal shrinkage during treadmill walking

2012

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Introduction Everyday activities such as walking may elicit spinal shrinkage in an order of magnitude that has been related to lower back pain. The present study aims to compare the effects of unloaded treadmill walking with walking carrying loads representing everyday shopping tasks. Materials and methods Walking tasks were performed on seven healthy males and motion analysis was used to track four reflective markers at 100 Hz, dividing the spine into three segments. Static data was collected in 5-min intervals over a 30-min period. Results Total spinal length and lumbar segment decreased with respect to time (p \ 0.001). Load affected the percentage length change at each spinal segment (p \ 0.005), with the lumbar segment showing greatest height loss at the highest load. The upper and lower thoracic segments showed greater anterior lean with the heavier loads (p = 0.000) and the lumbar segment showed the opposite trend (p = 0.000). Conclusion Results suggest that the body adopts less anterior lean with an immediate load-bearing demand, to decrease the necessary extension moment generated by the spinal extensors for spinal stability. Further postural alteration in the same direction is observed with prolonged loading. In combination with lumbar spinal shrinkage, such postural changes are likely to increase the loading on the facet joints and subsequently unload the discs which may be beneficial for those with low back pain.

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The Effect of Posture on the Fluid Content of Lumbar Intervertebral Discs

Cited by 224 publications

References 0 publications

Load shift of the intervertebral disc after a vertebroplasty: a finite-element study

Load shift of the intervertebral disc after a vertebroplasty: a finite-element study

Ageing and degenerative changes of the intervertebral disc and their impact on spinal flexibility

The effects of upper limb loading on spinal shrinkage during treadmill walking

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