Cluneal Nerve Block

Cluneal neuralgia is pain caused by irritation or entrapment of the cluneal nerves, small sensory nerves that cross the top and back of the pelvis to supply the low back and buttock. It typically causes one-sided low back or buttock pain that worsens with bending, twisting, standing or walking, and it can spread down the leg^[2][6]. It is often mistaken for SI joint pain, facet pain or sciatica.

A cluneal nerve injection, or block, places a small amount of local anesthetic — sometimes with a steroid — at the spot where a cluneal nerve is trapped, usually along the back of the iliac crest. It is done with ultrasound guidance while you lie face down and takes only a few minutes. If your usual pain fades while the area is numb, the cluneal nerve is the likely cause^[2].

Most people find it only mildly uncomfortable. The nerves are close to the skin, so a thin needle and a small amount of medicine are used. You may feel a pinch, brief pressure and sometimes a flash of your familiar pain as the medicine reaches the nerve. Soreness usually lasts a day or two.

Eat normally, wear comfortable clothing and come with your usual level of pain so the test is easier to read. Tell us about blood thinners, diabetes and allergies. Shallow nerve blocks are generally lower-risk for bleeding under interventional pain guidelines^[7], but never stop a blood thinner without talking to the doctor who prescribed it. Sedation is rarely needed, so many patients can drive themselves.

For the rest of the day, do the movements that usually hurt — bending, walking, sitting — and notice how your pain responds; that tells your physician whether the block worked. The skin over the buttock may feel numb for a few hours. Avoid strenuous exercise that day and resume normal activities the next day.

The numbing effect lasts a few hours, but some people get longer relief. In the largest study, most patients with superior cluneal nerve disorder had more than a 50% drop in pain scores after one to three weekly injections^[3]. How long that relief lasts varies, and long-term data are limited^[5]. If relief keeps wearing off, longer-lasting options can be discussed.

Yes. Blocks are often given as a short series when the first one helps, as in the study where injections were repeated weekly up to three times^[3]. If a steroid is used, your physician will limit how often it is given. If you keep needing blocks, radiofrequency treatment, peripheral nerve stimulation or a surgical release may be considered.

Cluneal nerve pain usually centers on one precise, very tender spot on the top or back of the pelvic bone, and pressing there reproduces the pain. SI joint pain sits lower, over the joint, and sciatica from a disc usually follows a nerve-root pattern down the leg with numbness or weakness. The overlap is large, so targeted blocks of each possible source are often the clearest way to tell them apart^[4].

Decompression, or neurolysis, is a minor surgery in which a surgeon frees the nerve from the tight fascia or ligament that traps it, often under local anesthesia. In a published series, patients’ disability scores improved substantially after surgery, though some needed further treatment later^[2]. Surgery is usually reserved for people whose blocks confirm the diagnosis but whose relief does not last. Less invasive options, such as radiofrequency or nerve stimulation, may come first^[5].

Serious complications are rare because the nerves are close to the surface. The most common side effects are soreness at the injection site and temporary numbness of the skin over the buttock. If a steroid is used, you may notice flushing or a short rise in blood sugar. Infection, bleeding and allergic reactions are uncommon. If X-ray guidance is planned, tell us if you might be pregnant.

Coverage depends on your plan. Medicare’s New York policy for peripheral nerve injections, effective October 25, 2026, covers only the nerve blocks it lists, and cluneal nerve blocks are not among them, so Medicare is unlikely to pay for therapeutic cluneal blocks^[1]. Some commercial plans cover them with prior authorization, and New York workers’ compensation and no-fault claims follow their own rules. Our staff will verify your benefits and explain any out-of-pocket costs before scheduling.