Cervical canal stenosis can be acquired (trauma, discs, ossification of the posterior longitudinal ligament etc...) or congenital.
- normal AP diameter is approximately 17 mm.
- relative stenosis 10 - 13 mm.
- absolute stensosis < 10 mm.
The width of the canal is not however constant, and progressively decreases as one moves down the cervical spine.
- C1 : 23 mm
- C2 : 20 mm
- C3 - C6 : 17mm
- C7 : 15 mm
This is a the ratio of the diameter of cervical canal to the width of cervical body. Less than 0.8 on lateral view is consistent with cervical stenosis.
Similar to Torg ratio, relates canal-vertebral body width (how does this differ??) and should be approximately 1.0. Less than 0.85 indicates stensosis, and again less than 0.80 is a significant risk factor for neurologic injury in relatively minor trauma.
- 1. Wheelessonline
- 2. C.R. Clark "The Cervical Spine"
Synonyms & Alternative Spellings
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|Cervical canal stenosis (MSK)||✗|