Do NOT Use Intramuscular Steroid Injections for Disc Protrusion Without Radicular Pain
For patients with disc protrusion without radicular pain (chronic axial spine pain), intramuscular steroid injections should NOT be used. The most recent high-quality evidence from the 2025 BMJ clinical practice guideline provides a strong recommendation AGAINST intramuscular injection of local anaesthetic with or without steroids for chronic axial spine pain 1.
Why This Recommendation is Strong
The 2025 BMJ guideline panel issued strong recommendations against intramuscular injections for chronic axial spine pain based on:
- Low certainty evidence showing intramuscular injection of local anaesthetic with steroids actually increased pain compared to sham procedures 1
- No benefit on pain relief for intramuscular injections with or without steroids 1
- Small but real risks including 8.6% risk of prolonged pain/stiffness, 2.1% risk of altered consciousness, and 0.7% risk of deep infection 1
- Very rare catastrophic harms including paralysis, spinal cord injury, and death have been documented with spinal steroid injections 1
The Critical Distinction: Axial vs. Radicular Pain
Your patient has disc protrusion without radicular pain - this is the key clinical feature:
- Axial pain = midline spine pain without leg/arm radiation
- Radicular pain = nerve root irritation causing pain radiating down extremities (sciatica)
The evidence shows steroid injections (whether intramuscular, epidural, or joint-targeted) provide little to no benefit for axial pain, even when disc pathology is present 1.
Conflicting Guidelines - Why the BMJ 2025 Guideline Wins
You'll encounter contradictory recommendations in older guidelines:
- 2022 ASPN guideline recommended trigger point injections for chronic back pain 1
- 2021 ACOEM guideline stated trigger point injections with local anesthetic may be recommended, but specifically noted glucocorticosteroids are NOT recommended 1
However, the 2025 BMJ guideline supersedes these because it:
- Is the most recent (2025 vs. 2021-2022)
- Published in a top-tier journal (BMJ)
- Used rigorous network meta-analysis methodology
- Explicitly compared interventions to sham procedures
- Included patient values and preferences in recommendations
What About Radicular Pain?
If your patient did have radicular symptoms, the evidence is different but still not supportive:
- Epidural steroids show modest short-term pain reduction (0.97 points on 0-10 scale at 3 months) for radicular pain 2
- No impact on physical disability or surgery rates 2
- The 2025 BMJ guideline still recommends against epidural injections even for radicular pain 1
Common Pitfalls to Avoid
Don't confuse imaging findings with treatment indications - disc protrusions are common incidental findings with low correlation to symptoms 1
Don't assume "inflammation" justifies steroids - even patients with inflammatory end-plate changes (Modic Type 1) showed only temporary benefit from steroid injections 3
Don't use intramuscular route as "safer alternative" - the evidence shows it may actually worsen pain 1
The Cost-Benefit Analysis
Patients must weigh:
- Minimal to no benefit on pain or function
- 2-fold increased risk of adverse events 4
- Financial burden and need for repeated treatments every 2 weeks to 3 months 1
- Access barriers requiring travel to specialized facilities 1
Bottom Line
Intramuscular steroid injections have no role in managing disc protrusion without radicular pain. The 2025 BMJ guideline represents the highest quality, most recent evidence and explicitly recommends against this intervention for chronic axial spine pain 1. Focus instead on evidence-based conservative management including exercise, NSAIDs, and physical therapy.