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Selective Nerve Root Block
A selective nerve root block (SNRB) is a highly targeted injection that delivers medication directly around a single nerve root as it exits the spinal column — providing both diagnostic information and therapeutic relief.
What is a Selective Nerve Root Block?
When pain, numbness, or weakness radiates down an arm or leg, it often traces back to a specific irritated or compressed nerve root in the spine. A selective nerve root block (SNRB) is a highly targeted injection that delivers medication directly around a single nerve root as it exits the spinal column — providing both diagnostic information and therapeutic relief. Because this procedure targets one specific nerve rather than the general epidural space, it can help identify exactly which level of the spine is responsible for a patient's symptoms. At River Cities Interventional Pain Specialists, selective nerve root blocks are performed under fluoroscopic guidance to ensure precise, effective delivery.
What To Expect
The procedure is performed in our clinic or at Park Plaza Surgical Specialists and takes approximately 20–30 minutes:
✔️ You'll be positioned on the procedure table and the skin at the target site will be cleaned and numbed.
✔️ Under fluoroscopic guidance, Dr. Brewer advances a thin needle to the neural foramen — the opening in the spine where the target nerve exits.
✔️ A small amount of contrast dye is injected first to confirm accurate placement alongside the nerve root.
✔️ The therapeutic medication — typically a combination of local anesthetic and corticosteroid — is carefully injected around the nerve.
✔️ You'll be monitored briefly before being cleared to go home.
Results and Recovery
Recovery is minimal. Mild soreness at the injection site is possible for 24–48 hours. If the block provides rapid, significant pain relief in the hours following the procedure, this confirms which nerve root is generating your symptoms. Maximum anti-inflammatory benefit from the steroid typically develops over 3–7 days and may last weeks to several months. A follow-up appointment will review your response and guide any additional treatment planning.
A selective nerve root block is particularly useful for patients who:
✔️ Have radiating arm pain (cervical radiculopathy) or radiating leg pain (lumbar radiculopathy / sciatica)
✔️ Have multiple levels of spinal pathology on imaging and need to identify which level is causing symptoms
✔️ Are preparing for surgery and require diagnostic confirmation of the target level
✔️ Have not responded adequately to standard epidural steroid injections
✔️ Have had prior spinal surgery with persistent or recurrent radicular symptoms
WHO IS THIS BEST FOR?
Frequently Asked Questions
A standard epidural injection covers a broader area of the epidural space. A selective nerve root block is placed directly alongside a single nerve root as it exits the spine — making it both more targeted therapeutically and more informative diagnostically.
Many patients notice improvement in their radiating pain within 15–30 minutes as the local anesthetic takes effect. This immediate response is diagnostically meaningful. The steroid's longer-lasting anti-inflammatory effect builds over the following days.
For many patients, yes — a selective nerve root block provides enough relief to avoid or delay surgery. For others, it serves as an important diagnostic step that helps confirm the surgical target. Dr. Brewer will discuss your options based on your imaging and clinical presentation.
Nerve root blocks can be repeated as needed, though guidelines generally recommend limiting steroid-containing injections to a reasonable frequency. If repeated injections are needed, we may discuss alternative long-term strategies such as spinal cord stimulation or surgical evaluation.
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