Radiofrequency nerve ablation is a minimally invasive procedure that uses heat generated by electrical current to disable specific nerves and stop them from sending pain signals. A needle-like electrode is placed next to the targeted nerve, and the tip is heated to between 55 and 80 degrees Celsius, creating a small lesion that interrupts the nerve’s ability to transmit pain. The procedure is most commonly used for chronic back, neck, and joint pain that hasn’t responded to other treatments, and pain relief typically lasts 6 to 12 months before the nerve regrows.
How the Procedure Works
The core idea is straightforward: if a specific nerve is responsible for carrying a pain signal, heating a small section of that nerve destroys its ability to function. The electrode delivers radiofrequency current (alternating electrical current) that vibrates molecules in the surrounding tissue, generating friction and heat. Once tissue temperature rises above 45 degrees Celsius, nerve fibers begin to break down. Most procedures target a range of 60 to 80 degrees Celsius, carefully staying below the point where tissue would produce gas bubbles, which happens around 80 to 90 degrees.
Early research suggested the heat might selectively destroy only certain pain-carrying nerve fibers while sparing others. That turned out not to be the case. The heat destroys all nerve fibers in its path without distinction, which is why the technique is primarily used on small sensory nerves rather than major nerves that also control movement. For the most common application, treating spinal facet joint pain, the target is the medial branch nerve, a tiny sensory nerve that relays pain from the joint but doesn’t control any muscles you need.
Conditions It Treats
The most frequent use is for facet joint pain in the lower back and neck. Facet joints are the small joints that connect each vertebra to the one above and below it. When they become arthritic or inflamed, they can cause chronic, nagging pain that worsens with twisting or bending backward. Radiofrequency ablation of the medial branch nerves supplying these joints is one of the best-studied applications.
Beyond the spine, the procedure is also used for sacroiliac joint pain (the joint connecting your lower spine to your pelvis), chronic knee pain from osteoarthritis, hip joint pain, and shoulder pain. It can also be recommended for neck pain following whiplash injuries. In each case, the goal is the same: identify the nerve carrying the pain signal and disable it with heat.
The Diagnostic Test That Comes First
You won’t typically go straight to ablation. First, your doctor needs to confirm which nerve is causing the problem. This is done with a diagnostic nerve block, where a small amount of local anesthetic is injected near the suspected nerve under imaging guidance. If the injection temporarily eliminates or significantly reduces your pain, that confirms the nerve is the right target.
The threshold for what counts as a “positive” response varies. The most common standard used in practice, largely driven by insurance requirements, is at least 80% pain relief from two separate diagnostic blocks. However, a 2022 set of multi-society consensus guidelines recommended a less restrictive standard of 50% relief from a single block. Your provider will tell you which criteria they follow, but the basic principle is the same: the diagnostic block acts as a test run, and ablation only proceeds if the test is convincing.
What Happens During the Procedure
Radiofrequency ablation is an outpatient procedure, meaning you go home the same day. You’ll lie face down on a procedure table, and the skin over the treatment area is numbed with local anesthetic. Using fluoroscopy (real-time X-ray) for guidance, the doctor advances a thin, insulated needle to the target nerve. The needle has an electrode at its tip connected to a radiofrequency generator.
Before creating the lesion, the doctor runs a brief stimulation test. A low-level electrical current is sent through the needle to confirm it’s in the right spot. Sensory stimulation should reproduce your familiar pain pattern at a low voltage, and motor stimulation checks that the needle isn’t too close to a nerve that controls muscle movement. Once positioning is confirmed, the electrode tip is heated to the target temperature, typically for 60 to 150 seconds depending on the location. For sacroiliac joint pain, for instance, a common protocol uses 60 degrees Celsius for 150 seconds. The entire procedure usually takes 30 to 90 minutes depending on how many nerves are treated.
Types of Radiofrequency Ablation
There are three main variations, each suited to different situations.
Conventional (thermal) radiofrequency ablation is the standard technique described above. The electrode heats continuously to a set temperature, creating a well-defined lesion around the nerve. This is the most widely used and most studied form.
Pulsed radiofrequency delivers current in short bursts (20 milliseconds on, then off, cycling twice per second for about 2 minutes) so the tissue never reaches the temperatures that destroy nerve fibers. Instead of killing the nerve, it appears to modulate nerve signaling through mechanisms that aren’t fully understood. Because it doesn’t destroy the nerve, pulsed radiofrequency carries less risk of side effects, but the evidence for lasting pain relief is also less consistent. It’s sometimes chosen when the target nerve is close to motor fibers or in areas where permanent nerve damage would be problematic.
Cooled radiofrequency ablation uses internal water circulation to cool the electrode tip during heating. This prevents the tissue immediately around the needle from charring, which would otherwise limit how far the heat can spread. The result is a significantly larger lesion. Studies comparing lesion sizes found that cooled radiofrequency produced an average lesion volume of 595 cubic millimeters, substantially larger than standard or protruding-electrode systems. This is especially useful for sacroiliac joint pain and knee pain, where the target nerves are harder to pinpoint and a bigger lesion improves the odds of catching the right nerve.
Success Rates and Duration of Relief
When patients are properly selected through diagnostic blocks, radiofrequency ablation has strong success rates. A prospective study of cervical (neck) radiofrequency ablation found that 81% of patients achieved at least 50% pain reduction at one month, and 80% still had that level of relief at 12 months. Across multiple real-world studies, response rates for 50% or greater pain relief consistently fall in the 70% to 88% range.
Pain relief from a single procedure generally lasts 6 to 12 months and in some cases up to 2 years. The variation depends on lesion size and individual healing rates. The nerve eventually regrows, a process called reinnervation, and pain gradually returns. The good news is that the procedure can be repeated. Each subsequent ablation typically provides another 10 to 16 months of improvement in patients who responded to the first one. Many people undergo repeat procedures every year or two as part of an ongoing pain management strategy.
Recovery After the Procedure
Most people can return to normal activities within a few days. You should plan to rest and avoid strenuous activity for the first 48 to 72 hours. If sedation was used, you’ll need someone to drive you home, and for the first 24 hours you should avoid driving, operating machinery, drinking alcohol, or making important legal or financial decisions.
It’s common to experience increased soreness at the treatment site for the first one to two weeks. This happens because the heat creates a small area of inflammation as the lesion forms. Some people feel worse before they feel better. The full benefit of the procedure often takes 2 to 4 weeks to develop as the inflammation settles and the disrupted nerve stops transmitting signals. Ice packs and over-the-counter pain relievers can help bridge this gap.
Risks and Side Effects
Radiofrequency ablation is considered a low-risk procedure, but it’s not without potential complications. The most common side effect is temporary increased pain at the treatment site, which nearly everyone experiences to some degree in the first week or two.
A more notable complication is post-procedure neuropathic pain, a burning or shooting pain caused by nerve irritation. A study of cooled radiofrequency ablation for sacroiliac joint pain found this occurred in about 9.4% of patients, though it was transient in all cases. On a per-lesion basis, the rate was only 0.7%, but since most procedures involve multiple lesions, the per-patient rate is higher. Other possible but uncommon risks include localized numbness in the skin overlying the treated area, minor bleeding or bruising at the needle insertion site, and infection, which is rare given the small needle size and sterile technique.
Because the procedure destroys all nerve fibers in the target zone indiscriminately, there’s a theoretical risk of motor nerve damage if the electrode is misplaced. This is why the stimulation testing step before lesioning is so important, and why ablation is generally limited to locations where the target nerves are purely sensory.