Canadian C-Spine Rule Calculator

Canadian C-Spine Rule Calculator for Neurology. No high-risk factor, a qualifying low-risk feature and adequate bilateral active rotation yield a negative rule. The original Figure 2 uses fall >=1 m or 5 stairs: https://sinaiem.org/wp-content/uploads/2016/11/Stiell-Canadian-Cspine-rule-for-radiography-in-alert-and-stable-trauma-patients.pdf

For shared guidance on choosing a tool and documenting results, read the clinical calculator workflow.

How this calculator works

Apply the three ordered decisions: any high-risk factor indicates imaging; otherwise a low-risk factor must permit rotation assessment; then both directions must reach 45 degrees. Original study: https://pubmed.ncbi.nlm.nih.gov/11597285/

When to use this calculator

Clinician-assessed alert, stable blunt-trauma patients within the stated population. Exclusions include pregnancy, vertebral disease, acute paralysis and reassessment of the same injury.

Inputs used

  • Eligibility: alert stable blunt trauma, age >=16, within 48 hours, appropriate symptoms and no stated exclusions
  • Age in years
  • Dangerous mechanism
  • Extremity paresthesias
  • Simple rear-end collision
  • Sitting in the ED
  • Ambulatory after injury
  • Delayed onset of neck pain
  • Absence of midline cervical tenderness
  • Active rotation >=45 degrees left AND right, only when permitted

Clinical interpretation

No high-risk factor, a qualifying low-risk feature and adequate bilateral active rotation yield a negative rule. The original Figure 2 uses fall >=1 m or 5 stairs: https://sinaiem.org/wp-content/uploads/2016/11/Stiell-Canadian-Cspine-rule-for-radiography-in-alert-and-stable-trauma-patients.pdf

Worked example

A 65-year-old who walked after a simple rear-end collision still meets a high-risk criterion. The result is imaging; walking and rotation cannot subtract that indication.

Limitations and safety notes

Never force movement or use this as a self-clearance exercise. Unknown findings cannot clear the neck. Later presentations may phrase fall height differently; this widget explicitly uses the 2001 metric convention and does not prescribe imaging modality.

Frequently asked questions

Can several low-risk findings offset age 65?

No. Any high-risk criterion ends the rule at the imaging branch. Rotation assessment is hidden in that situation.

References

  • Stiell et al. Original Canadian C-Spine derivation, 2001: https://pubmed.ncbi.nlm.nih.gov/11597285/
  • Original JAMA paper in Mount Sinai emergency medicine repository; eligibility and Figure 2: https://sinaiem.org/wp-content/uploads/2016/11/Stiell-Canadian-Cspine-rule-for-radiography-in-alert-and-stable-trauma-patients.pdf

Editorial review and citation methodology

Maintained by the Quick Medical Calculator Editorial Team. Content record date: September 9, 2026. A content date is not evidence of independent clinical review. Individual clinical sign-off is not recorded on this page.

  • Prefer original validation studies for scoring systems and prediction tools.
  • Use current specialty society guidance, transplant allocation policy, public health guidance, or regulator resources when they govern clinical use.
  • Include limitations and safety notes when a calculator is population-specific, context-dependent, or unsuitable as a standalone decision tool.

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