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Transforaminal Injection

What is a transforaminal injection?

A transforaminal injection is an injection of long acting steroid into the opening at the side of the spine where a nerve roots exits. This opening is known as a foramen. There is a small sleeve of the epidural space that extends out over the nerve root for a short distance. This epidural root sleeve is just outside the spinal canal. Sometimes these injections are referred to as root sleeve blocks, root blocks, or transforaminal epidural blocks.


What is the purpose of a transforaminal injection?

The steroid reduces the inflammation and swelling of spinal nerve roots and other tissues surrounding the spinal nerve root. This may in turn reduce pain, tingling, numbness, and other symptoms caused by such inflammation, irritation, or swelling. Also, the transforaminal injections can be used to identify a specific spinal nerve root level or levels that are the source of pain.


How long does the transforaminal injection take?

The actual injection takes five to ten minutes.


What is actually injected?

The injection consists of a mixture of saline, local anesthetic, and the long acting steroid medication. The amount of medication actually injected is very small, rarely more than one or two milliliters.


Will the transforaminal injection hurt?

The injection involves inserting a needle through the skin and deeper tissues. There is some pain involved. However, we often numb the skin and deeper tissues with a local anesthetic using a very thin needle before inserting the injection needle. Once numbed, placing the injection needle often feels more like a strong pressure and pinching, not pain.

How is the transforaminal injection performed?

It is done either with the patient on the side for most neck injections and with the patient on the stomach for back injections. Occasionally other positions are used to optimize the X-ray view. The skin of the neck or back is cleaned with antiseptic solution and sometimes numbed with local anesthetic. Then the injection needle is placed under X-ray guidance. Once in place, the injection is made and this will often feel like the normal pain that the patient feels in the distribution of that particular spinal nerve root. Finally, the needle is removed and an adhesive bandage is applied.


What should I expect after the transforaminal injection?

Immediately after the injection, you may feel like your arm or leg is slightly heavy and may be numb, depending on where the injection was done and how much local anesthetic was used. Even so, despite the numbness, most patients can still actively move their arm or leg. This strange effect comes from the concentration of the local anesthetic and not from the amount of local anesthetic. Also, you may notice that your pain may be gone or quite less. This immediate effect is also due to the local anesthetic injected. This will last only for a few hours. Your pain may return and you may have some soreness or aching for a day or two. This is due to the mechanical process of needle insertion, as well as initial irritation from the medications injected. You should start noticing pain relief starting the third day or so.


What should I do after the transforaminal injection?

Most patients are advised to take it easy for a day or so after the procedure until the medication has a chance to work. However, most patients can perform any activity that they could perform before the procedure.


Can I go back to work the next day?

You should be able to go back to work the next day unless the procedure was extensive or complicated. Usually you will feel some soreness or aching at the injection site only.


How long does the effect of the medication last?

The immediate effect is usually from the local anesthetic injected. This wears off in a few hours. The steroid starts working in about 3 to 5 days and its effect can last for several days to several months.


What are the risks and side effects?

Generally speaking, transforaminal injections are safe. However, with any procedure there are risks, side effects and possibility of complications. The most common side effect is pain from the actual injection once the local anesthetic wears off and this pain is temporary. The other uncommon risk involve spinal puncture with headaches, infection, bleeding inside the epidural space, nerve damage, and worsening of symptoms. Other uncommon risks are related to the side effects of the long acting steroid such as weight gain, increase in blood sugar in diabetics, water retention, and suppression of body's own natural production of steroids.


Possible Risks and Complications of Lumbar Epidural Injection

  • Spinal headache

  • Bleeding (rare)

  • Infection

Call your healthcare provider if you have a fever over 101.0°F, chills, redness, or drainage at the treatment site.







The Pain Management Nurse will phone you in one week to follow-up on your progress. 

If you have questions or concerns please contact:

  • Pain Management Clinic: 507.529.6733

  • Urgent Care Center/Emergency Room: 507.529.6650