How Soon After a Collision Should You Get Spinal Imaging?

By Dr. Justin M. Dick, DC, CNMT, ARRT(N)(CT) | Clear Life Scoliosis and Chiropractic Center, Charlotte, NC | Published October 16, 2026

The timing of spinal imaging after a car accident depends on what the imaging is meant to find. A possible fracture needs CT the day of the crash. A possible disc herniation with nerve symptoms, or a possible ligament injury, is usually evaluated in the days or weeks that follow. Many people need no imaging at all. Getting the order right matters more than getting a scan quickly, and that is the framework I use with patients in Charlotte.

The Day of the Crash: Fracture

Emergency clinicians decide who needs immediate neck imaging with decision rules. Under NEXUS, a patient needs imaging unless all five low-risk criteria are met: no midline cervical tenderness, no focal neurologic deficit, normal alertness, no intoxication, and no painful distracting injury (Hoffman, N Engl J Med 2000). Under the Canadian C-Spine Rule, age 65 or older, numbness or tingling in the arms or legs, or a dangerous mechanism such as a rollover or a collision above 100 km/h means imaging (Stiell, CMAJ 2010).

When imaging is needed, the American College of Radiology prefers CT to radiographs for the initial assessment of spine trauma (Beckmann, J Am Coll Radiol 2019).

Delayed Pain Is Not a Reason to Skip the Exam

The Canadian rule treats delayed onset of neck pain, meaning pain that did not start immediately after the collision, as a low-risk factor (Stiell, CMAJ 2010). That lowers the probability of a fracture. It does not mean nothing was injured. A patient whose neck starts hurting the next day still needs an examination, and the high-risk findings still apply. New numbness, weakness, or midline tenderness at any point sends the patient for CT.

The Following Days and Weeks: Discs and Ligaments

The ACR criteria rate MRI as usually appropriate when there is concern for ligament injury, and preferred for assessing neurologic injury (Beckmann, J Am Coll Radiol 2019). In practice, that means MRI when the exam shows nerve root signs such as arm or leg weakness, changed reflexes, or numbness in a nerve distribution, or when the exam raises concern for a ligament injury.

Flexion and extension X-rays are timed differently. An acutely injured neck or back guards against movement, and a segment that does not move cannot show excessive motion. I take motion films once fracture is excluded and enough motion has returned for the test to load the segment. That is clinical reasoning. I am not aware of a study that defines the best interval.

At Three Months: Reassess

A meta-analysis of 38 whiplash cohorts found that most recovery happens in the first three months, after which recovery rates level off and pain and disability change little (Kamper, Pain 2008). A patient who is not substantially better by then should have the workup reviewed for anything missed, including imaging that was not done earlier because it was not yet indicated.

When Imaging Is Not Needed

Imaging findings are common in people without pain. In pain-free adults, lumbar disc degeneration ranged from 37% at age 20 to 96% at age 80 (Brinjikji, AJNR 2015). Imaging done without a clear question often produces findings that cannot be interpreted. A scan should be ordered to answer something the exam raised.

For an example of how post-collision imaging findings and outcomes are documented in the peer-reviewed literature, read Dr. Justin Dick's published case report on refractory lumbar pain following a motor vehicle accident in a geriatric patient.

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Frequently Asked Questions

How soon after a car accident should I get a CT scan?

The same day, if a decision rule calls for it. High-risk findings include midline neck tenderness, a focal neurologic deficit, tingling in the arms or legs, age 65 or older, or a dangerous mechanism such as a rollover.

My neck started hurting the day after the accident. Do I still need to be checked?

Yes. Delayed onset of neck pain is a low-risk factor for fracture under the Canadian C-Spine Rule (Stiell, CMAJ 2010), but it does not rule out other injuries, and new neurologic symptoms still require CT.

When should I get an MRI after a car accident?

MRI is usually appropriate when there is concern for ligament or neurologic injury (Beckmann, J Am Coll Radiol 2019), such as arm or leg weakness, reflex changes, or numbness in a nerve distribution.

When should flexion and extension X-rays be taken after a car accident?

After fracture is excluded and enough motion has returned for the test to load the segment. Dr. Justin Dick times these films clinically in Charlotte, NC, since no study defines the ideal interval.

What if I am not better three months after a car accident?

Most whiplash recovery occurs in the first three months and then levels off (Kamper, Pain 2008). If you are not substantially better by then, the workup should be reviewed for anything missed.

Where can I get evaluated for spinal imaging after a car accident in Charlotte, NC?

Dr. Justin Dick, DC, CNMT, ARRT(N)(CT), evaluates car accident patients for imaging needs at Clear Life Scoliosis and Chiropractic Center, 8814 Rachel Freeman Way, Suite 103, Charlotte, NC 28278, phone 980-368-0766. Personal injury patients are treated on a lien basis, with no out-of-pocket payment at the time of care.

Sources and Evidence Tiers

1. Stiell IG, Clement CM, O'Connor A, et al. Multicentre prospective validation of use of the Canadian C-Spine Rule by triage nurses in the emergency department. CMAJ. 2010;182(11):1173-1179. PMID 20457772. LinkEvidence tier: Prospective multicenter validation cohort
2. Hoffman JR, Mower WR, Wolfson AB, Todd KH, Zucker MI. Validity of a set of clinical criteria to rule out injury to the cervical spine in patients with blunt trauma. N Engl J Med. 2000;343(2):94-99. PMID 10891516. LinkEvidence tier: Prospective multicenter cohort
3. Beckmann NM, West OC, Nunez D, et al. ACR Appropriateness Criteria: Suspected Spine Trauma. J Am Coll Radiol. 2019;16(5S):S264-S285. PMID 31054754. LinkEvidence tier: Evidence-based guideline with expert panel rating (RAND/UCLA and GRADE)
4. Kamper SJ, Rebbeck TJ, Maher CG, McAuley JH, Sterling M. Course and prognostic factors of whiplash: a systematic review and meta-analysis. Pain. 2008;138(3):617-629. PMID 18407412. LinkEvidence tier: Systematic review and meta-analysis of prospective cohorts
5. Brinjikji W, Luetmer PH, Comstock B, et al. Systematic literature review of imaging features of spinal degeneration in asymptomatic populations. AJNR Am J Neuroradiol. 2015;36(4):811-816. PMID 25430861. LinkEvidence tier: Systematic review

Service Area

Clear Life Scoliosis and Chiropractic Center sees personal injury and spinal imaging patients from Charlotte NC, Huntersville NC, Ballantyne NC, Matthews NC, Concord NC, Mooresville NC, Rock Hill SC, and Fort Mill SC.

Related Pages

• Personal injury and car accident spinal care in Charlotte
• Dr. Justin Dick's research
• Case report: refractory lumbar pain after a motor vehicle accident
• Research and evidence at Clear Life
• Questions and answers
• Our team
• Press
• Book your evaluation
• Contact Clear Life

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This article is educational and is not a diagnosis. Imaging decisions depend on an in-person examination.