Why a Normal MRI Does Not Rule Out a Spinal Ligament Injury

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

A normal MRI after a car accident rules out some spinal injuries well and others poorly. It is good at showing a disc herniation and a complete ligament tear in severe trauma. It cannot show whether a ligament has been stretched enough to let a vertebra move too far, because the scan is taken with the patient lying still. Patients in Charlotte are often told their MRI is normal and assume that settles the question. It settles part of it.

What MRI Does Well

In severe trauma, MRI finds most complete ligament disruptions. In 31 patients who had cervical spine surgery after trauma, MRI was compared with what the surgeons saw directly. It detected 93% of posterior longitudinal ligament injuries, 93% of disc injuries, and 100% of interspinous soft tissue injuries (Goradia, AJNR 2007). For a torn ligament in a patient badly hurt enough to need an operation, MRI is a strong test.

Where MRI Falls Short

The same study shows the weak spots. MRI detected 71% of anterior longitudinal ligament injuries and 67% of ligamentum flavum injuries, so about a third of tears in those two ligaments were missed even in surgical cases (Goradia, AJNR 2007).

MRI also errs in the other direction. In 89 patients with spinal fractures, MRI signal in the posterior ligaments was compared with findings at surgery, and specificity ranged from 51.5% to 80.5% depending on the reader and the structure (Rihn, J Neurosurg Spine 2010). Bright signal on MRI does not always mean a torn ligament. A normal MRI and an abnormal MRI both need to be read with that error in mind.

The Position Problem

A standard MRI is taken lying down, with no weight on the spine. Some abnormal alignment only appears under load. At a Charlotte spine center, 416 patients with degenerative lumbar conditions had both supine MRI and standing X-rays. Of 109 spondylolisthesis levels seen on the standing films, 31, or 28%, were not visible on the MRI (Segebarth, J Spinal Disord Tech 2015). Those patients had degenerative conditions, not injuries. The study shows how much lying down can hide. It does not give a miss rate for trauma.

The Motion Problem

A subfailure ligament injury, a stretch without a complete tear, may leave the ligament looking normal on a still image. What changes is how far the segment moves. The AMA Guides to the Evaluation of Permanent Impairment accept loss of motion segment integrity only on plain-film lateral flexion and extension radiographs. They do not use MRI or CT for that finding.

Motion films have a limit of their own. Panjabi described the neutral zone, the range of motion near the resting posture where the spine offers little resistance. In cadaver, animal, and mathematical studies, the neutral zone increased with injury, and its change was more sensitive than the change in total range of motion (Panjabi, J Spinal Disord 1992). Flexion and extension X-rays measure the ends of the range. They cannot see the neutral zone directly. A normal motion study lowers the probability of a ligament injury. It does not exclude one.

How I Read a Normal MRI Report

When a patient brings me an MRI report read as normal, I treat it as answering two questions: is there a disc herniation, and is there a gross ligament tear? The third question, whether a segment moves too far, needs a different test. I order motion X-rays when the exam points to a segment, meaning focal tenderness, pain on movement at that level, or symptoms that track to it, and only after fracture has been excluded. Not every patient with neck pain and a normal MRI has a ligament injury, and motion films are not a routine add-on for everyone.

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.

Schedule Your Evaluation

Frequently Asked Questions

Can a normal MRI miss a spinal ligament injury?

Yes. MRI is taken lying still and cannot measure excessive motion. Even in surgical trauma cases, MRI detected only 71% of anterior longitudinal ligament injuries and 67% of ligamentum flavum injuries (Goradia, AJNR 2007).

What does a normal MRI rule out after a car accident?

A normal MRI makes a disc herniation and a severe complete ligament tear unlikely. It does not rule out a stretched ligament that allows too much motion between vertebrae.

Why does lying down for an MRI matter?

Some alignment problems only appear when the spine bears weight. At a Charlotte spine center, supine MRI missed 28% of spondylolisthesis levels seen on standing X-rays (Segebarth, J Spinal Disord Tech 2015). That study involved degenerative conditions, not injuries.

Can an MRI overcall a ligament injury?

Yes. In 89 spinal fracture patients, MRI specificity for posterior ligament injury ranged from 51.5% to 80.5% (Rihn, J Neurosurg Spine 2010). Abnormal signal does not always mean a tear.

What test shows ligament instability if MRI is normal?

Lateral flexion and extension X-rays measure motion between vertebrae. The AMA Guides accept motion segment integrity findings only on these films. Dr. Justin Dick orders them in Charlotte, NC when the exam points to a specific segment and fracture has been ruled out.

Where can I get a second look at a normal MRI after a car accident in Charlotte, NC?

Dr. Justin Dick, DC, CNMT, ARRT(N)(CT), reviews post-accident imaging 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. Goradia D, Linnau KF, Cohen WA, Mirza S, Hallam DK, Blackmore CC. Correlation of MR imaging findings with intraoperative findings after cervical spine trauma. AJNR Am J Neuroradiol. 2007;28(2):209-215. PMID 17296981. LinkEvidence tier: Diagnostic accuracy cohort (31 surgical patients)
2. Rihn JA, Yang N, Fisher C, et al. Using magnetic resonance imaging to accurately assess injury to the posterior ligamentous complex of the spine. J Neurosurg Spine. 2010;12(4):391-396. PMID 20367374. LinkEvidence tier: Prospective diagnostic accuracy cohort
3. Segebarth B, Kurd MF, Haug PH, Davis R. Routine upright imaging for evaluating degenerative lumbar stenosis: incidence of degenerative spondylolisthesis missed on supine MRI. J Spinal Disord Tech. 2015;28(10):394-397. PMID 25353204. LinkEvidence tier: Retrospective cohort
4. American Medical Association. Guides to the Evaluation of Permanent Impairment, Fourth, Fifth, and Sixth Editions.Evidence tier: Expert consensus (impairment rating guideline)
5. Panjabi MM. The stabilizing system of the spine. Part II. Neutral zone and instability hypothesis. J Spinal Disord. 1992;5(4):390-396. PMID 1490035. LinkEvidence tier: Hypothesis built on cadaveric, animal, and mathematical studies (mechanistic reasoning)

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

Schedule Your Evaluation in Charlotte

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