Spinal Injections Guide: Epidural Steroid Injections, Facet Blocks & Nerve Root Blocks Explained

What Are Spinal Injections?

Spinal injections are minimally invasive procedures that deliver medication — typically a combination of local anesthetic and corticosteroid — directly to specific anatomical targets in the spine. They serve dual purposes: diagnostic (confirming the pain source) and therapeutic (reducing inflammation and pain).

Spinal injections account for nearly 40% of all neurosurgical cases in the United States, making them among the most commonly performed neurosurgical procedures.

Types of Spinal Injections

Epidural Steroid Injections (ESI)

Epidural steroid injections deliver anti-inflammatory medication into the epidural space — the area surrounding the spinal cord and nerve roots. Three approaches are used:

• Interlaminar ESI: Medication enters between vertebral laminae, spreading broadly in the epidural space. Best for bilateral symptoms or central stenosis.
• Transforaminal ESI: A targeted approach through the neural foramen directly to the affected nerve root. Preferred for single-level radiculopathy (sciatica, cervical radiculopathy).
• Caudal ESI: Administered through the sacral hiatus at the base of the spine. Used for diffuse lower lumbar or post-surgical pain.

Facet Joint Injections & Medial Branch Blocks

The facet joints are small paired joints along the back of the spine that can become arthritic and painful. Diagnostic and therapeutic options include:

• Intra-articular facet injection: Steroid injected directly into the inflamed facet joint.
• Medial branch block: Anesthetic placed on the tiny nerves supplying the facet joint to confirm the pain source.
• Radiofrequency ablation (RFA): After positive medial branch blocks, heat energy disrupts the pain-carrying nerves for 6-12 months of relief.

Selective Nerve Root Blocks (SNRB)

A selective nerve root block targets a single spinal nerve with anesthetic and steroid. This is especially valuable when MRI shows abnormalities at multiple levels and the clinical question is which level is causing symptoms.

When Are Spinal Injections Recommended?

Your neurosurgeon may recommend spinal injections for:

• Herniated disc with radiculopathy (sciatica or arm pain)
• Spinal stenosis causing leg pain with walking
• Facet arthropathy causing axial neck or back pain
• Degenerative disc disease with inflammatory pain
• Post-surgical pain evaluation
• Pre-surgical planning to confirm the symptomatic level

What to Expect During the Procedure

1. Preparation: You lie on your stomach on a fluoroscopy table. The skin is cleaned and numbed with local anesthetic.
2. Image guidance: All injections are performed under live fluoroscopy (X-ray) for pinpoint accuracy.
3. Injection: A thin needle is advanced to the target structure. Contrast dye confirms correct placement before medication is delivered.
4. Duration: The procedure takes 15-30 minutes.
5. Recovery: You're monitored for 30-60 minutes, then discharged with a driver.

How Effective Are Spinal Injections?

Research shows:

• ESI for radiculopathy: 50-80% of patients experience significant pain relief lasting weeks to months
• Facet blocks + RFA: 70-80% pain reduction for 6-12 months in appropriately selected patients
• SNRB diagnostic accuracy: Over 90% for identifying the symptomatic nerve root

How Many Injections Do I Need?

A typical treatment series involves 1-3 injections spaced 2-4 weeks apart. Many patients achieve lasting relief after a single injection; others benefit from the full series. Injections can be safely repeated when symptoms recur, though most guidelines recommend limiting to 3-4 sessions per year.

Can Injections Prevent Surgery?

For many patients, yes. A well-placed injection series can provide enough pain relief to avoid surgery entirely, or to bridge the gap while pursuing physical therapy and other conservative treatments. However, injections are not a substitute for surgery when there is significant nerve compression causing weakness or progressive neurological deficits.

Spinal Injections at Nova Brain and Spine of GA

At our Hampton, Georgia practice, both Dr. Marcus Stephens and Dr. Jerry Walters II perform fluoroscopy-guided spinal injections with same-week appointment availability. We serve patients throughout Southern Georgia and the greater Atlanta area.

To schedule a consultation, call (770) 515-8770 or visit our office at 700 Manassas Street, Suite 300, Hampton, GA 30228.