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Related Experiment Videos

Paraspinal denervation and the spinal degenerative cascade.

Andrew J Haig1

  • 1The Interdepartmental Spine Program, University of Michigan, 325 East Eisenhower Parkway, Ann Arbor, MI 48108, USA. andyhaig@umich.edu

The Spine Journal : Official Journal of the North American Spine Society
|November 1, 2003
PubMed
Summary

Paraspinal muscle denervation is common in asymptomatic individuals and may be a better indicator of spinal stenosis than MRI. This denervation could contribute to spinal degeneration.

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Area of Science:

  • Spinal anatomy and biomechanics
  • Neurology and electrodiagnostics
  • Geriatric medicine and degenerative diseases

Background:

  • The Kirkaldy-Willis degenerative cascade model of spinal aging does not incorporate paraspinal muscles.
  • Recent research highlights the role of paraspinal muscles in spinal health and disease.
  • Paraspinal denervation is linked to pain in various spinal disorders.

Purpose of the Study:

  • To investigate the relationship between paraspinal muscle denervation and the spinal degenerative cascade.
  • To explore the potential role of paraspinal muscle denervation in spinal aging and pathology.

Main Methods:

  • Literature review, reanalysis of existing electromyographic data, and case report analysis.
  • Utilized a novel needle electromyography technique (MiniPM) for paraspinal muscle assessment.

Related Experiment Videos

  • Evaluated asymptomatic volunteers and patients with spinal stenosis using MiniPM, MRI, and functional tests.

    • Main Results:

    • Symptomatic spinal stenosis patients exhibited significant paraspinal denervation (MiniPM score of 6/side).
    • Asymptomatic individuals frequently showed subtle paraspinal denervation (57%), predominantly in caudal regions.
    • Estimated denervating events occurred approximately every 120 days in the general population.

    Conclusions:

    • Paraspinal muscle denervation, assessed by MiniPM, may serve as a more sensitive marker for symptomatic spinal stenosis than MRI.
    • Subtle paraspinal denervation is a common finding in asymptomatic individuals.
    • Paraspinal denervation may influence spinal hypermobility and accelerate the degenerative cascade, regardless of whether it is a cause or effect.