Selective Nerve Blocks

Foraminal Stenosis and SNRB Explained

Lower back pain can often result from a condition called foraminal stenosis. The “foramina” are openings on either side of the spine where nerves exit. When these openings become narrowed—a condition known as foraminal stenosis—it can compress the exiting nerves, leading to pain.

Several spinal issues can lead to this narrowing, including facet joint arthritis, degenerative disc disease, spinal stenosis, post-laminectomy syndrome, or a herniated disc (which may cause radiculopathy). When a nerve root is compressed within the narrowed foramen, it often results in discomfort or pain in the lower back and possibly down the leg.

To better understand what’s happening in the spine, doctors often order imaging tests such as an MRI or CT scan. However, what shows up on imaging doesn’t always match the patient’s symptoms or the pain’s exact location. It’s also common for stenosis to appear at several spinal levels, which can make diagnosis confusing.

A Selective Nerve Root Block (SNRB) is an injection that helps identify the specific nerve causing pain. It can also provide temporary relief by reducing inflammation and irritation around the affected nerve.

Side Effects of a Selective Nerve Root Block

This procedure is generally safe and low-risk, but some side effects may occur. These can include a spinal headache or minor bleeding. There’s also a small chance of allergic reaction or infection.

Conditions That May Be Treated or Diagnosed with This Procedure:

Spinal stenosis

Sciatica

Herniated disc