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For healthcare professionals

Canadian C-Spine Rule

The Canadian C-Spine Rule helps decide which alert, stable trauma patients need imaging of the cervical spine (neck). It works in three steps: high-risk factors, low-risk factors, then whether the patient can turn the neck. Stiell and colleagues published it in 2001. This tool is written for clinicians and is not a diagnosis.

Last reviewed: By the uncovermyrisk.com editorial team Educational only, not medical advice.

After a fall, crash or blow, neck pain with numbness, tingling or weakness in the arms or legs: keep the person still and call 911 now.General safety advice (not part of the published rule). The rule is for patients already being assessed; it does not replace urgent care.

Patient findings

Tick each finding that applies. Nothing you enter leaves this page.

Does the rule apply?

The rule applies only if the first box is ticked and the second is not.

Step 1: high-risk factors
Step 2: low-risk factors
Step 3: neck rotation

Test rotation only if there is no high-risk factor and at least one low-risk factor.

Result appears here

What you will see

Whether the rule calls for cervical spine imaging, and at which step.

Educational only, not medical advice. Not a diagnosis. Imaging decisions belong to the treating team.

Source

Stiell IG and colleagues, JAMA 2001. The steps, definitions and exclusions are taken from the open-access (CC BY) Table 2 of Gesu and colleagues, Internal and Emergency Medicine 2021, and match Table 4 of Mahmood and Abouelkheir, Cureus 2025 (CC BY). The tests check each high-risk factor, each low-risk factor, the rotation step and the eligibility boxes.

Validated in

Alert (Glasgow Coma Scale 15) and stable trauma patients. The rule was derived in 8,924 such patients (Al Zareeni 2026). It excludes patients younger than 16, with grossly abnormal vital signs, injured more than 48 hours earlier, with penetrating trauma, acute paralysis or known vertebral disease, returning for the same injury, and pregnant patients (Gesu 2021).

Limits

The rule is built to withhold imaging safely in low-risk patients, not to find injury: a result of imaging indicated does not mean the spine is injured. Specificity is low (42.5% in the original validation), so many patients without injury are still imaged (Al Zareeni 2026).

The rule

The rule works in three steps (Gesu 2021):

  1. Any high-risk factor? Age 65 or older, a dangerous mechanism, or paresthesias in the extremities. If yes, image.
  2. Any low-risk factor that allows a safe range of motion assessment? A simple rear-end motor vehicle collision, sitting position in the emergency department, ambulatory at any time, delayed onset of neck pain, or absence of midline cervical spine tenderness. If no, image.
  3. Able to actively rotate the neck 45 degrees left and right? If no, image. If yes, the rule does not call for imaging.

Definitions

A dangerous mechanism is a fall from 1 m or more or 5 stairs, an axial load to the head (for example diving), a motor vehicle collision at high speed (over 100 km/h), with rollover or with ejection, a motorized recreational vehicle accident, or a bicycle collision (Gesu 2021).

A simple rear-end collision excludes being pushed into oncoming traffic, being hit by a bus or large truck, a rollover, and being hit by a high-speed vehicle. Delayed onset means the neck pain did not start immediately (Gesu 2021).

The same steps are described by Mahmood and Abouelkheir (Mahmood 2025). The rule was derived and validated by Stiell and colleagues (Stiell 2001).

Worked example: a 40-year-old in a simple rear-end collision at low speed, with no paresthesias, who was walking at the scene and can turn the neck 45 degrees each way, has no high-risk factor, two low-risk factors and full rotation, so the rule does not call for imaging. If the same patient were 70, the age alone would call for imaging.

What the studies found

The rule was derived in 8,924 alert, stable patients, 151 (1.7%) of whom had a clinically important cervical spine injury. On cross-validation it had a sensitivity of 100% (95% confidence interval 98% to 100%) and a specificity of 42.5% (Al Zareeni 2026).

A review quoting a systematic review of 15 studies and 79,526 patients reports a sensitivity of 0.90 to 1.0 for the rule, with poor specificity throughout (Al Zareeni 2026).

Related calculators

For a five-item alternative, see the NEXUS C-spine criteria. For head injury, see the Canadian CT Head Rule. Other bedside scores are listed under For healthcare professionals.

Sources

  1. Gesu E, Bellone P, Bonzi M, et al. Management of patients with cervical spine trauma in the emergency department: a systematic critical appraisal of guidelines with a view to developing standardized strategies for clinical practice. Intern Emerg Med. 2021;16(8):2277-2296. doi:10.1007/s11739-021-02838-1. PMID 34609677. Open access (CC BY 4.0). Table 2: Canadian C-spine rule steps, dangerous mechanism and simple rear-end definitions, exclusion criteria. pmc.ncbi.nlm.nih.gov/articles/PMC8563599/
  2. Mahmood A, Abouelkheir M. Delayed Presentation of a Cervical Spine Fracture: A Case Report. Cureus. 2025;17(3):e80705. doi:10.7759/cureus.80705. PMID 40242695. Open access (CC BY 4.0). Table 4: the Canadian C-Spine rule. pmc.ncbi.nlm.nih.gov/articles/PMC12001663/
  3. Al Zareeni OT, Azzabi A, Pillai A. Benefit and Harm in the Early Management of Suspected Cervical Spine Injury: A Narrative Review. Cureus. 2026;18(9):e117067. doi:10.7759/cureus.117067. PMID 42953686. Open access (CC BY 4.0). Derivation in 8,924 patients, 151 (1.7%) injuries; sensitivity 100%, specificity 42.5%; 15 studies, 79,526 patients, sensitivity 0.90 to 1.0. pmc.ncbi.nlm.nih.gov/articles/PMC13714950/
  4. Stiell IG, Wells GA, Vandemheen KL, et al. The Canadian C-spine rule for radiography in alert and stable trauma patients. JAMA. 2001;286(15):1841-1848. doi:10.1001/jama.286.15.1841. PMID 11597285. Original paper (cited; the criteria used here are taken from Gesu 2021, CC BY). pubmed.ncbi.nlm.nih.gov/11597285/

Written and maintained by the uncovermyrisk.com editorial team. We do not have a medical reviewer; every claim links to its primary source above. Last reviewed: 2026-11-02. Spotted an error? See About.