Ablation for back pain is a minimally invasive procedure that uses heat to disable the tiny nerves carrying pain signals from your spine to your brain. The most common form, radiofrequency ablation (RFA), targets nerves around the facet joints or sacroiliac joint, and pain relief typically lasts six to 12 months. It’s not a cure, but for people with chronic back pain that hasn’t responded to other treatments, it can provide meaningful relief without surgery.
How Ablation Stops Pain Signals
Your spine’s facet joints, the small joints that connect each vertebra to the one above and below it, are a common source of chronic low back pain. These joints are supplied by nerves called medial branches, which are offshoots of the larger spinal nerves running along the back of your spine. Each facet joint receives input from the medial branches of two adjacent spinal nerve levels, meaning pain from a single joint can radiate across a broader area than you might expect.
During radiofrequency ablation, a doctor uses a specialized needle-like probe to deliver concentrated heat directly to these medial branch nerves. The heat creates a small lesion on the nerve, disrupting its ability to transmit pain signals. The joint itself isn’t repaired or changed. The nerve is simply prevented from telling your brain that it hurts. Think of it as cutting a phone line: the problem at the other end still exists, but the call can’t get through.
Who Qualifies for the Procedure
You won’t go straight from a doctor’s visit to an ablation. The standard path involves one or two diagnostic nerve blocks first. During a nerve block, a doctor injects a local anesthetic near the same medial branch nerves that would be targeted during ablation. If the injection temporarily eliminates or significantly reduces your pain, that confirms the facet joints are the actual source, and you’re a good candidate for the longer-lasting ablation.
The threshold for “significant” relief varies by practice, but most protocols require at least 50% pain reduction from the diagnostic block, with some centers requiring 80% or more. Patients who meet higher thresholds tend to have better outcomes after ablation. If the nerve block doesn’t help much, the pain is likely coming from somewhere else, such as a disc, muscle, or nerve root, and ablation wouldn’t be effective.
What Happens During the Procedure
Ablation is an outpatient procedure, meaning you go home the same day. You’ll lie face down on a table while the doctor uses real-time X-ray imaging (fluoroscopy) to guide a thin probe to the exact location of the target nerve. A local anesthetic numbs the skin and tissue along the probe’s path, so you’re awake but shouldn’t feel sharp pain.
Once the probe is in position, the doctor may test it with a small electrical current to confirm it’s near the correct nerve and not close to any motor nerves that control muscle movement. Then the probe tip is heated, typically to around 80°C (176°F), for 60 to 90 seconds. This creates a precise lesion just a few millimeters wide. Multiple nerves are usually treated in one session, depending on how many levels of the spine are involved. The entire procedure generally takes 30 to 90 minutes.
Traditional vs. Cooled Radiofrequency
Standard RFA probes heat tissue directly at the tip, but this can cause charring at the contact point, which limits how large the lesion can get. Cooled radiofrequency ablation circulates water through the probe tip to regulate the surface temperature, preventing charring and allowing heat to spread further into the surrounding tissue. The result is a larger, more spherical lesion that increases the chance of fully capturing the target nerve, especially when the nerve’s exact path varies slightly from person to person.
Cooled RFA is particularly common for sacroiliac joint pain, where the nerves follow less predictable routes. In a multicenter comparative study, about 42% of patients treated with cooled RFA for sacroiliac joint pain achieved at least 50% pain reduction at three months, compared with roughly 7% of patients who continued with standard medical management alone. The cooled RFA group also showed meaningful improvements in physical function and quality of life scores.
How Long Relief Lasts
Pain relief from ablation typically lasts six to 12 months. The reason it’s temporary is that nerves regenerate. The treated medial branch nerve slowly regrows, and once it reconnects, pain signals can resume. This regrowth usually happens within six to 12 months after the procedure.
The good news is that the procedure can be repeated. Many patients undergo ablation on a recurring basis, getting a new round of treatment when pain returns. Some people find that repeat procedures provide similar or even longer-lasting relief compared to the first time, though individual results vary.
Recovery After Ablation
Most people experience soreness at the treatment sites for a few days to a couple of weeks after the procedure. This is normal and results from the tissue irritation caused by the heat. Some patients notice a temporary increase in pain before the relief kicks in. The full benefit of ablation may not be apparent for two to four weeks, since the nerve needs time to fully stop transmitting signals after being lesioned.
Activity restrictions are minimal. Most people return to work within a day or two, though heavy lifting and strenuous exercise are typically avoided for the first week. Ice packs and over-the-counter pain relievers can help manage post-procedure soreness.
Risks and Long-Term Concerns
Ablation is considered low-risk compared to surgical options, but it’s not without trade-offs. The most common side effect is temporary increased soreness or a burning sensation at the treatment site. Numbness or a small patch of skin sensitivity near the treated area can also occur and usually resolves on its own.
One consequence that gets less attention is the effect on the multifidus muscle, a deep stabilizing muscle that runs along the spine. The same medial branch nerves that carry pain signals also supply the multifidus, so ablating them inevitably causes some degree of muscle denervation. Research from Penn State University has documented short-term multifidus atrophy and increased fat infiltration in the muscle following RFA. More concerning, the same research group found increased disc degeneration at the treated spinal level within a year of the procedure, and that RFA patients had two to five times the risk of developing other degenerative conditions or needing spine surgery over the following five to ten years compared to other chronic low back pain patients.
These findings don’t necessarily mean ablation caused the degeneration directly. People who get RFA already have significant spinal problems, and it’s difficult to separate the natural progression of their condition from the effects of the procedure. But the data is worth understanding, especially if you’re considering repeated ablations over many years. Maintaining core strength through physical therapy and exercise after the procedure may help offset some of the muscle-related effects.
What Ablation Can and Cannot Do
Ablation works best for pain that originates in the facet joints or sacroiliac joint. It is not effective for pain caused by herniated discs pressing on nerve roots, spinal stenosis, or muscle strain. If your pain radiates down your leg (sciatica), ablation of the medial branch nerves is unlikely to help, because those nerves serve a different function than the ones being compressed.
It’s also not a standalone treatment. Most pain specialists recommend combining ablation with physical therapy, exercise, and other strategies to address the underlying factors contributing to spinal pain. The window of reduced pain after ablation can be an ideal time to build strength and improve mobility, potentially reducing the severity of pain when the nerve eventually regrows.