Will an MRI of the cervical spinal cord help determine if a steroid injection is appropriate?

MRI of the Cervical Spinal Cord and Steroid Injection Decision-Making

Yes, an MRI of the cervical spinal cord is essential and will directly determine whether a steroid injection is appropriate by identifying the specific pathology causing your symptoms. 1, 2

Why MRI is Critical Before Steroid Injection

MRI is superior to CT for identifying soft-tissue pathologies that cause neurologic symptoms and guide treatment decisions 1. Specifically, MRI can detect:

• Spinal cord compression from disc herniation, bone fragments, or hematomas
• Epidural hematomas (missed in 13% of cases on CT alone)
• Nerve root compression and the exact level affected
• Cord contusion or hemorrhage
• Ligamentous injuries
• Disc herniations (present in 36% of cervical spinal cord injury cases)

1, 2, 1

How MRI Findings Guide Steroid Injection Decisions

When Steroid Injection May Help:

Research shows that central canal stenosis on MRI predicts significantly better response to epidural steroid injection (mean improvement of 23 points on disability scales versus 0.85 points without stenosis, P=0.002) 3. This is the single strongest MRI predictor of steroid injection success.

When Steroid Injection Should NOT Be Given:

For traumatic spinal cord injury, systemic steroids are NOT recommended - they provide no neurological benefit and increase infectious complications (7% vs 3% infection rate) 2. This is a GRADE 1 strong recommendation from 2020 French guidelines based on the NASCIS trials showing no long-term benefit and higher complication rates.

Critical Safety Consideration:

MRI must be reviewed before injection to assess vertebral artery proximity and foraminal anatomy 4. Foraminal narrowing correlates with vertebral artery proximity to the needle target, increasing risk of catastrophic complications including cerebellar or spinal cord infarction. One case report documented quadriplegia from direct spinal cord injection during cervical epidural steroid injection 5.

The Clinical Algorithm:

1. Obtain MRI first - it should be performed "as soon as possible" when neurological deficit is present 2

2. Review MRI for:

   • Central canal stenosis (predicts good steroid response)
   • Cord compression requiring urgent surgery (steroid injection contraindicated)
   • Vertebral artery position relative to injection target
   • Specific level and side of nerve root involvement

3. Steroid injection is appropriate if:

   • Central canal stenosis is present
   • No cord compression requiring surgery
   • Safe needle trajectory can be planned
   • Non-traumatic radiculopathy

4. Surgery or other treatment if:

   • Cord compression from disc, hematoma, or bone
   • Traumatic spinal cord injury
   • Unsafe anatomy for injection

Important Caveats:

• Long-term benefit is limited: Only 35-45% of patients achieve clinically significant pain reduction at 1 month, though some studies show benefit lasting up to 1 year 6, 7
• MRI findings don't always predict response: Except for central canal stenosis, other MRI features (disc herniation severity, nerve root compromise) do NOT reliably predict steroid injection success 3, 6, 7
• Ultrasound or CT guidance is essential for accurate needle placement and safety 4, 8

The bottom line: Get the MRI first - it will show whether steroid injection is safe, appropriate, and likely to help your specific condition.