Transforaminal Epidural Steroid Injection (TFESI)

OVERVIEW

What it is and how it works

A transforaminal epidural steroid injection is a targeted approach to epidural pain relief. Instead of placing medication into the back of the epidural space along the midline, the physician guides a thin needle toward the neural foramen — the bony opening where a specific nerve root exits the spine. This lets the steroid be deposited right alongside the affected exiting nerve root, close to where inflammation is generating pain.

The injected corticosteroid is intended to reduce swelling and irritation around the nerve, while a small amount of local anesthetic can provide early relief. Because the medication is placed so close to one identified nerve, the transforaminal route is among the most target-specific epidural techniques for pain that follows a single nerve down one arm or one leg. When pain improves after the injection, it can also help confirm which nerve level is involved, so a TFESI may be both diagnostic and therapeutic.

This procedure is one of several approaches within our spinal epidural injection program at Columbia Pain & Spine Institute, with care provided across our Gresham and Portland, Oregon locations.

CONDITIONS

What a TFESI commonly treats

This injection is best suited to radicular pain — symptoms that travel along the path of one specific nerve root rather than staying local to the back or neck.

YOUR VISIT

What to expect

After and recovery

You are monitored briefly and can usually go home the same day. Because the local anesthetic may temporarily affect the leg or arm — and any light sedation can linger — plan to have someone drive you. Mild soreness at the injection site is common for a day or two. The local anesthetic may ease pain quickly, while the steroid generally takes effect over several days; how much relief you feel and how long it lasts vary from person to person. Many people resume normal activity within a day, and your physician will guide any return to physical therapy or exercise.

QUESTIONS

Frequently asked questions

How is a TFESI different from a standard epidural steroid injection?

A standard epidural steroid injection spreads medication over a broader area of the epidural space, while a transforaminal injection is aimed at one specific exiting nerve root through its foramen. The transforaminal route is generally chosen when pain clearly follows a single nerve down one limb.

Is the injection diagnostic or therapeutic?

It can be both. The steroid is intended to reduce inflammation and ease pain (therapeutic), and because the medication targets one identified nerve, your response can also help confirm whether that nerve level is the pain source (diagnostic).

How many injections will I need?

This varies from person to person. Some people get meaningful relief from a single injection, while others may benefit from a small series spaced out over time. Your physician will recommend a plan based on how you respond and your overall treatment goals.

RELATED CARE

Explore related procedures

If radicular pain persists or your diagnosis points elsewhere, your physician may discuss other targeted options.

See our full range of interventional pain services or contact our Gresham and Portland, Oregon clinic to learn whether a transforaminal epidural steroid injection is right for you.