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Related Experiment Videos

Slow deformation of intervertebral discs

K B Broberg

    Journal of Biomechanics
    |April 1, 1993
    PubMed
    Summary

    Intervertebral disc height changes daily due to fluid shifts and fiber deformation. Mechanical modeling quantifies these effects, revealing diurnal fluid flow impacts disc hydration and height.

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    Area of Science:

    • Biomedical Engineering
    • Biomechanics
    • Spinal Research

    Background:

    • Intervertebral discs undergo significant time-dependent deformations under varying loads.
    • These deformations are driven by fluid flow (due to pressure differences) and viscoelasticity of annulus fibers.

    Purpose of the Study:

    • To develop a mechanical model of lumbar disc function.
    • To calculate fluid flow, disc height changes, and the role of annulus fiber viscoelasticity.
    • To estimate diurnal body height variations.

    Main Methods:

    • Utilized a mechanical model of lumbar disc mechanics.
    • Calculated fluid flow based on mechanical and osmotic pressure gradients.
    • Incorporated viscoelastic deformation of annulus fibers.
    • Estimated body height changes using model outputs and literature data.

    Main Results:

    • Normal diurnal fluid flow can alter disc fluid content by +/- 40% by evening.
    • Viscoelastic deformation of annulus fibers accounts for about 25% of height change after prolonged activity.
    • Annulus fiber viscoelasticity is the dominant factor in height changes during the first hour of activity.

    Conclusions:

    • Mechanical modeling accurately predicts intervertebral disc height variations.
    • Both fluid dynamics and fiber viscoelasticity are critical components of diurnal height changes.
    • The model provides insights into normal diurnal body height rhythmicity and exceptional circumstances.

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