Epidural Steroid Injection Techniques in Spinal Pain Management

Epidural steroid injections have become a cornerstone in the nonsurgical management of spinal pain arising from conditions such as disc herniation, lumbar spinal stenosis and radiculopathy. By delivering corticosteroids directly into the epidural space, these interventions aim to attenuate inflammation around affected nerve roots and to interrupt pain signalling. Three principal approaches are employed: interlaminar, transforaminal and caudal. Each technique differs in anatomical entry point, target zone within the epidural space and risk profile. Interlaminar injections access the dorsal epidural space between adjacent laminae, offering broad dispersion of agents but carrying a modest risk of dural puncture. Transforaminal injections navigate through the neural foramen to target the ventral epidural compartment close to the inflamed nerve root, which may yield more focused relief but demands precise imaging guidance. Caudal injections via the sacral hiatus allow high-volume delivery to the lower lumbar and sacral regions, especially useful in multi‐level pathology. Advances in imaging guidance – notably fluoroscopy and ultrasound – have improved accuracy and safety, reducing radiation exposure and procedural complications. Overall, epidural steroid injection techniques represent a versatile, minimally invasive option that can delay or obviate the need for surgery, enhance patient function and ameliorate quality of life.

Research from Nature Portfolio

A recent comparative study evaluated ultrasound-guided versus fluoroscopy-guided lumbar selective nerve root blocks in patients with radicular pain. Both modalities yielded equivalent reductions in pain scores and functional indices at 30 minutes, one month and six months. Ultrasound guidance proved as accurate as fluoroscopy for needle placement, with significantly shorter procedure times and fewer needle angle adjustments. Crucially, reliance on ultrasound eliminated radiation exposure without compromising safety or therapeutic effect. These findings support the adoption of ultrasound guidance as a primary imaging modality for selective nerve root blocks, offering a radiation-free alternative while maintaining procedural efficiency and patient outcomes.

Epidural Steroid Injection Techniques in Spinal Pain Management publication trend

The graph below shows the total number of articles in epidural steroid injection techniques in spinal pain management across all publications each year (not limited to Nature Index journals).

Technical terms

Epidural space: The potential compartment between the dura mater and the vertebral canal that surrounds the spinal cord and nerve roots.

Interlaminar approach: Injection technique accessing the dorsal epidural space through the interlaminar window between adjacent vertebral laminae.

Transforaminal approach: Technique in which the needle is advanced through the neural foramen to target the ventral epidural space near a specific nerve root.

Caudal approach: Injection via the sacral hiatus at the base of the spine to access the sacral and lower lumbar epidural space.

Selective nerve root block: A procedure that delivers medication adjacent to a single spinal nerve root under imaging guidance to diagnose or treat radicular pain.

Fluoroscopy: Real-time X-ray imaging used during injections to visualise needle position and contrast spread.

Ultrasound guidance: Imaging technique using high-frequency sound waves to visualise soft tissues and guide needle placement without radiation.

Corticosteroids: Anti-inflammatory drugs, such as triamcinolone, administered in the epidural space to reduce nerve root inflammation.

References

1. The Composition of the L5-S1 Neural Foramen on MRI—A Retrospective Cohort Study Examining the Anatomy Relevant to Transforaminal Epidural Steroid Injections. Anesthesia Research (2024).
2. Ultrasound-guided versus fluoroscopy-guided lumbar selective nerve root block: a retrospective comparative study. Scientific Reports (2024).
3. Epidural steroid compared to placebo injection in sciatica: a systematic review and meta-analysis. European Spine Journal (2021).
4. Epidural Steroid Injections for Low Back Pain: A Narrative Review. International Journal of Environmental Research and Public Health (2021).