An image-guided injection that calms inflammation around an irritated nerve root — so you can move, sleep, and rehab while your body recovers.
An epidural steroid injection — often shortened to ESI — delivers a small dose of anti-inflammatory corticosteroid into the epidural space, the thin layer of tissue surrounding the spinal cord and the nerve roots that branch from it. When a disc herniation, a bone spur, or spinal stenosis is irritating a nerve root, that nerve becomes inflamed and swollen, and the pain often travels down an arm or a leg. Bathing the area in steroid quiets that inflammation.
The injection is performed under fluoroscopy — live X-ray guidance — so the needle goes exactly where it needs to go and nowhere else. Depending on the level of your spine and the specific problem, we choose one of three approaches: interlaminar (between two vertebrae, delivering medication over a broader area), transforaminal (along the nerve root through a small bony opening, for a more targeted effect), or caudal (through a small opening at the base of the sacrum, useful for lower lumbar problems or scarring from prior surgery). The choice is a clinical one, and we'll explain why we're recommending the approach we are.
An ESI is most useful when your pain is radicular — meaning it radiates from your spine down an arm or a leg in the pattern of a specific nerve root — and imaging shows a structural reason for it. It's less reliable for pure axial back or neck pain without a radicular component.
An ESI is generally not appropriate if there's an active infection, uncontrolled bleeding risk, poorly controlled diabetes (steroids raise blood sugar transiently), known allergy to the medications, or progressive neurologic loss — weakness, foot drop, or loss of bowel or bladder control — that needs urgent surgical attention rather than injection.
We go over your medications, confirm the plan, answer questions, and have you change into a gown. You'll lie face-down on the fluoroscopy table.
The skin over your spine is cleaned and a small amount of local anesthetic is injected just under the skin — this is the part you actually feel.
Using live fluoroscopy, we advance a thin needle to the correct level, confirm position with a small amount of contrast dye, and then deliver the steroid and a small volume of anesthetic.
You'll rest for about 15–20 minutes so we can check your blood pressure and confirm you're moving well. The whole visit usually takes about 30–45 minutes.
You can go home the same day. If you've had only local anesthetic, most patients drive themselves; if light sedation was used, you'll need a ride. Plan to take it easy that day — no heavy lifting, no workouts, no long drives. Ice or heat over the injection site is fine, whichever feels better. The following day, most patients return to their normal activity.
Steroid usually takes 2 to 7 days to begin working, sometimes longer. How long the relief lasts is genuinely variable — some patients feel substantial improvement for weeks, some for months, and some get little benefit. If the first injection helps but the relief is incomplete or doesn't last, a second (and occasionally a third) may be considered. The goal is to reduce inflammation enough that you can engage with physical therapy, stay active, and let your body do the longer-term healing work. An ESI is not a cure for the underlying disc or stenosis — it's a tool to buy time and function.
Most patients tolerate an ESI well. Common, short-lived effects include soreness at the injection site, a temporary increase in pain for a day or two, facial flushing, a brief night of poor sleep, and a small rise in blood sugar in patients with diabetes. Women sometimes notice a transient change in their menstrual cycle. Less common risks include headache (especially if the dura is inadvertently punctured), bleeding, and infection. Serious neurologic complications are very rare and are minimized by using image guidance, contrast confirmation, and meticulous technique.
KeyTone Medical is out of network with all commercial health insurance plans, so this procedure is self-pay, with the cost discussed before anything is scheduled. Many plans reimburse part of the cost of medically necessary care performed out of network — on request we provide a superbill, an itemized and coded receipt, for you to submit to your insurer under your plan's guidelines.
No. An ESI doesn't change the disc, the bone, or the underlying structure — it reduces inflammation around the irritated nerve so that pain calms down and you can move and rehab. Many disc herniations improve on their own over weeks to months; the injection helps you get through that window without losing function.
Honestly, it varies. Some patients get a few weeks, some get many months, and some don't respond meaningfully. There's no reliable way to predict in advance who falls in which group. We'll re-evaluate at follow-up and decide together whether to repeat, change approach, or move on to a different option.
If we use only local anesthetic, yes — most patients drive themselves. If you receive light sedation for comfort, you'll need a ride home and shouldn't drive for the rest of the day.
Not necessarily. Some patients do well with a single injection. If the first one helps but relief is partial or short, a second can be considered, and rarely a third. We avoid an automatic "series of three" — each injection should earn its place based on how the prior one worked.
A transforaminal injection follows the path of a specific nerve root through the small opening where it exits the spine — more targeted, useful when one nerve is the clear culprit. An interlaminar injection enters between two vertebrae and spreads the medication more broadly — useful when the problem affects more than one level or the anatomy doesn't favor a transforaminal approach. Both are well established; the choice is based on your imaging and exam.
Authoritative references on this topic, for patients who want to read further. These are educational resources, not medical advice.
Educational information only. This page describes epidural steroid injections in general terms. Whether an ESI is appropriate for you depends on your history, exam, imaging, and treatment goals. The risks, benefits, alternatives, and expected results will be discussed in detail at your visit.
