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Related Experiment Videos

Cervical Spine Stenosis Measures in Normal Subjects.

Ryan T Tierney1, Catherine Maldjian, Carl G Mattacola

  • 1Temple University, Philadelphia, PA.

Journal of Athletic Training
|August 26, 2003
PubMed
Summary

The space available for the cord (SAC) measure, focusing on the spinal canal, may be a more effective indicator of cervical spinal stenosis than the Torg ratio. This finding is crucial for understanding neurologic injury related to spinal stenosis.

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Area of Science:

  • Orthopedics
  • Radiology
  • Neurology

Background:

  • Cervical spinal stenosis diagnosis relies on methods like the Torg ratio and space available for the cord (SAC).
  • Understanding the variability within these measurements is key for accurate clinical assessment.

Purpose of the Study:

  • To compare the Torg ratio and SAC for determining cervical spinal stenosis.
  • To identify which measurement components contribute most to variability.
  • To establish standardized SAC values using MRI.

Main Methods:

  • Compared Torg ratio and SAC measurements in 14 healthy male subjects (C3-C7 vertebrae).
  • Torg ratio calculated as sagittal spinal-canal diameter divided by vertebral-body diameter.
  • SAC calculated as sagittal spinal-canal diameter minus spinal-cord diameter.

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Main Results:

  • A significant correlation (r=.53) was found between Torg ratio and SAC.
  • Vertebral body size accounted for more Torg ratio variability (r²=.58) than spinal canal size (r²=.48).
  • Spinal canal size accounted for more SAC variability (r²=.66) than spinal cord size (r²=.23).

Conclusions:

  • The SAC measure, influenced more by spinal canal dimensions, may be a superior indicator of cervical spinal stenosis.
  • This is clinically relevant as neurologic injury is directly related to spinal canal and cord compromise.
  • Further research is needed to validate the SAC measure.