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Related Experiment Videos

Early and subtle signs in low-back sprain.

C C Gunn, W E Milbrandt

    Spine
    |September 1, 1978
    PubMed
    Summary

    Subtle signs of denervation supersensitivity, including myalgic hyperalgesia, were observed in patients with secondary low-back pain. These findings may help identify individuals with a vulnerable back.

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    Area of Science:

    • Neurology
    • Pain Medicine
    • Physiology

    Background:

    • Myalgic hyperalgesia is a previously reported sign in low-back sprain patients.
    • Denervation supersensitivity is a known phenomenon in peripheral nerve disease but underutilized in low-back pain research.
    • This phenomenon involves muscle and receptor supersensitivity to stimuli following neuronal denervation.

    Purpose of the Study:

    • To explore subtle signs of denervation supersensitivity in low-back pain.
    • To investigate the application of denervation supersensitivity signs to low-back pain patients.
    • To determine if these signs can differentiate types of low-back pain and identify vulnerable individuals.

    Main Methods:

    • Observational study comparing patients with secondary low-back pain, primary/mechanical low-back pain, and asymptomatic controls.
    • Assessment for multiphasic findings including autonomic dysfunction, trophic changes, cutaneous and myalgic hyperalgesia, and increased muscle tone.
    • Analysis of the frequency of these signs across different patient groups.

    Main Results:

    • One or more signs of denervation supersensitivity were present in patients with secondary low-back pain.
    • These signs were less frequent in patients with primary or mechanical low-back pain.
    • Slight presence of these signs in asymptomatic controls may indicate a vulnerable back.

    Conclusions:

    • Subtle signs related to denervation supersensitivity are associated with secondary low-back pain.
    • These signs, including myalgic hyperalgesia, may serve as indicators for a vulnerable back.
    • Further research is warranted to apply these physiological findings to clinical low-back pain assessment.

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