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Related Experiment Videos

Disc pressure measurements

A L Nachemson

    Spine
    |January 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Lumbar intervertebral disc pressure was measured in vitro and in vivo. Load on the lumbar disc significantly increases with certain postures and exercises, highlighting risks for spinal health.

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    Area of Science:

    • Biomedical Engineering
    • Orthopedics
    • Spinal Biomechanics

    Background:

    • The nucleus pulposus is crucial for lumbar intervertebral disc function.
    • Understanding intradiscal pressure is key to assessing spinal load and degeneration.

    Purpose of the Study:

    • To investigate the hydrostatic and hydrodynamic properties of the nucleus pulposus.
    • To quantify lumbar disc pressure variations under different physiological conditions.

    Main Methods:

    • In vitro measurement of intradiscal pressure in normal and degenerated lumbar discs.
    • Intravital measurement of lumbar disc pressure in over 100 individuals across various postures and activities.

    Main Results:

    • Hydrostatic properties were confirmed in normal discs; hydrodynamic properties were present in moderately degenerated discs.

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  • Lumbar disc pressure increases significantly with unsupported sitting (40%), forward leaning/weight lifting (>100%), and flexion/rotation (400%).
  • Reclining reduces disc pressure by 50-80% compared to standing.
  • Prescribed strengthening exercises can cause large increases in intradiscal pressure.

    • Conclusions:

    • Lumbar disc pressure is highly sensitive to body position and physical activity.
    • Certain common activities and exercises impose substantial loads on the lumbar intervertebral disc.
    • Findings have implications for understanding disc degeneration and developing strategies to mitigate spinal injury.