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Related Experiment Videos

Experimental chronic compressive cervical myelopathy

O al-Mefty1, H L Harkey, I Marawi

  • 1Department of Neurosurgery, Loyola University Medical Center, Maywood, Illinois.

Journal of Neurosurgery
|October 1, 1993
PubMed
Summary

A novel canine model for cervical spondylosis and myelopathy reveals that spinal cord compression causes delayed neurological deficits. Microcirculatory disturbances in gray matter, particularly affecting motor neurons, are implicated in the pathogenesis.

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Area of Science:

  • Veterinary Neurology
  • Comparative Pathology
  • Spinal Cord Research

Background:

  • Cervical spondylosis often leads to progressive myelopathy.
  • Existing models have limitations in controlling compression and assessing pathology.

Purpose of the Study:

  • To develop and validate a canine model for studying cervical spondylosis and myelopathy.
  • To investigate the pathophysiological mechanisms underlying compression-induced myelopathy.

Main Methods:

  • Created a canine model with controlled spinal canal stenosis using Teflon implants.
  • Assessed neurological deficits, spinal cord blood flow, electrophysiology, MRI, and histology.
  • Utilized hydrogen clearance for blood flow, somatosensory evoked potentials for function, and MRI for imaging.

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Main Results:

  • 12/14 dogs developed delayed (mean 7 months) progressive myelopathy after compression.
  • Spinal cord blood flow showed transient increase then decrease; electrophysiology indicated progressive deterioration.
  • Histology revealed gray matter abnormalities, neuronal loss, necrosis, and cavitation, predominantly at the compression site.

Conclusions:

  • The canine model effectively replicates cervical spondylosis-induced myelopathy.
  • Microcirculatory disturbances in gray matter, affecting anterior horn cells, are a key mechanism.
  • This model facilitates research into spinal cord injury and neurodegenerative diseases.