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Transforaminal and nerve root sleeve injections

A transforaminal injection targets a single spinal nerve root where it exits the spine. It is more selective than a standard epidural, which makes it useful both for treating pain from one specific nerve and for identifying which nerve is responsible.

Scans of the spine frequently show changes at more than one level, and not all of them cause symptoms. A transforaminal injection helps resolve which one matters. Medication is delivered precisely to a single nerve root as it exits through the foramen, so the response tells you something specific.

As a diagnostic step. If numbing one nerve root substantially relieves your limb pain, that nerve is very likely responsible. This is genuinely useful information — for you, and for a surgeon considering an operation, since operating at the wrong level is a well-recognised cause of failed surgery. Where surgery is being contemplated on the basis of ambiguous imaging, a diagnostic transforaminal injection may be requested specifically to confirm the level.

As a treatment. Anti-inflammatory medication delivered close to the irritated nerve can reduce pain for weeks to months, on a similar basis to an epidural injection but more selectively. Response varies widely and cannot be predicted with confidence beforehand.

On the day. You lie face down. Under X-ray guidance a fine needle is advanced to the target foramen. Contrast is injected first and its spread observed to confirm the needle is correctly placed and not within a vessel. Local anaesthetic, usually with anti-inflammatory medication, is then injected. You may feel a brief reproduction of your usual limb pain as the needle nears the nerve — this is expected and confirms the target. The procedure takes 20–30 minutes.

Afterwards. Temporary limb numbness or heaviness is common and resolves within hours. Record your pain in the hours after the procedure; that record is the diagnostic result. Any anti-inflammatory benefit develops over the following days.

Risks. Whilst pain procedures are generally safe and well tolerated, all procedures carry risks. The specific risks relevant to you and your procedure will be discussed with you, and written information provided, before you decide to proceed.

Urgent symptoms. As with epidural injection: numbness around the buttocks or genitals, bladder or bowel changes, or rapidly progressive weakness require emergency assessment.