Lumbar Epidural Injection for Sciatica

What is a lumbar epidural injection

A lumbar epidural injection delivers a corticosteroid together with a local anesthetic into the epidural space: the space surrounding the nerve roots inside the spine. The goal is to reduce the inflammation around the irritated nerve root and, with that, relieve the pain that runs down the leg.

There are two routes into that space. The transforaminal approach targets the exact opening where the affected root exits the spine, so the medication reaches right where it hurts. The interlaminar approach enters through the midline and bathes a wider area. Which route is best depends on your case: where the herniation is, which root is involved and your medical history. That is decided at the consultation, with your imaging in front of us.

What kind of pain it treats

This technique is designed for radicular pain: pain that starts in the spine but radiates down the leg along the path of a nerve. It is the condition most people know as sciatica.

The most common causes we treat this way are:

• A lumbar herniated disc compressing or irritating a nerve root.
• Sciatica, with pain running down the buttock, thigh or calf.
• Narrowing of the spinal canal (lumbar spinal stenosis) that causes leg pain when walking.

One important point: the indication rests on a prior diagnosis. I need your physical exam and an MRI showing that the image explains the pain you have. Not every case of low back pain is a candidate for an epidural; it helps when there is a clear radicular component.

What the day of the procedure is like

It is an outpatient procedure. You come in, have it done and go home the same day.

• It is performed under image guidance (fluoroscopy or ultrasound), to see in real time where the needle tip is and deliver the medication exactly where it needs to go. That guidance is what provides precision and safety.
• Local anesthesia is used on the skin. Most patients tolerate it very well; in some cases we add light sedation to help you relax.
• The injection itself takes just a few minutes. With preparation and a short observation period, plan on a couple of hours in total.
• It is best to come with someone and avoid driving afterwards, especially if you received sedation.

What results to expect

Here I want to be clear, because this is where the most overselling happens. An epidural injection treats the pain; it does not repair the herniation or reabsorb the disc. The structure is still there. What we do is reduce the inflammation of the nerve root so you stop having that pain that keeps you from sleeping or walking.

As for how much it helps: the evidence shows modest to moderate relief of radicular pain, mostly within the first three months, and more pronounced in the short term. The effect is variable from person to person and variable over time: for some it lasts weeks, for others months. It is not a "forever" injection.

That is why I think of it as a window of relief. That pain-free window is what allows you to move forward with physical therapy and rehabilitation, which are what sustain the improvement over the longer term. The injection opens the door; the rehabilitation work keeps it open.

Sometimes a single injection is enough. Other times a second one is scheduled depending on how you respond. We assess that together at your follow-up.

I will be straight with you about expectations, because it is what my patients ask about most and what gets said the least. The epidural will not fix your herniated disc. What it can do — and often does well — is take away that pain running down your leg long enough for you to move, do your physical therapy and get your daily life back. When there is a clearly irritated nerve root and the imaging confirms it, it is a tool that delivers. When the picture is not radicular, I would rather tell you so and look for another path than recommend a procedure that will not help you.

And one point that matters to me: the epidural is one option within a plan, not a race against anyone. If at some point your case needs a surgeon's perspective, that door stays open and we work as a team. My job is to manage the pain well along the way and put you in the best possible condition at every stage.

Where is it performed? Locations in Buenos Aires

I see patients at two locations: Hepta, in San Isidro (Av. Fondo de la Legua 577, Zona Norte) and CIAREC, in Villa Urquiza (Av. Monroe 4770, CABA). At the consultation we evaluate your case and coordinate where and when to perform the procedure. I see patients from across the northern suburbs of Greater Buenos Aires (Zona Norte) and from the City of Buenos Aires. Phone: (011) 5895-3260.

Insurance coverage and fees

The procedure is usually covered by many health insurance plans (both private prepagas and obras sociales (Argentine health funds)), although coverage and prior authorization depend on your specific plan. At the consultation I look at your particular case: what your plan covers, what authorization needs to be requested and in what order, so there are no surprises. If you prefer to pay out of pocket, that is also an option. I will tell you the fees and the logistics up front, before scheduling anything.

When to see a doctor and next steps

You should book a consultation if you have had pain running down your leg for several weeks, if it is not improving with medication and physical therapy, or if the pain limits your sleep, walking or work.

There are warning signs that call for more urgent attention, and it is worth knowing them: progressive loss of strength in the leg or foot, numbness in the buttocks, groin or genital area (saddle numbness), or any problem controlling your bladder or bowels. If any of these appears, do not wait for a scheduled appointment: seek care immediately.

The first step is always a consultation to review your imaging and examine you. From there we determine whether the epidural injection is the best option for you or whether another approach makes more sense. I see patients in San Isidro (Hepta) and Villa Urquiza (CIAREC), and I also offer virtual consultations for an initial evaluation.

Dr. Mauricio Casarsa

Anesthesiologist. Postgraduate training in Pain Medicine and Interventional Pain Management (UBA — Fundación Dolor; UNLP — CAIDBA). Staff physician at Hospital Alemán de Buenos Aires.

MN 137.756 (Argentine medical license) · San Isidro · Villa Urquiza