Nerve Ablation for the Relief of Chronic Pain
Medical disclaimer: The information below is educational only and should not be used to diagnose or treat any condition. Always seek personalised advice from a qualified physician or pain‑medicine specialist.
Chronic pain is a complex condition that goes beyond a lingering ache or discomfort. It’s typically defined as pain that persists for longer than 12 weeks, even after the initial injury or cause has healed. It affects around 20% of adults globally, disrupting everyday life and reducing quality of sleep, work productivity, and emotional wellbeing.
At the biological level, chronic pain often arises from a malfunction in how the nervous system processes signals. In some cases, peripheral nerves (outside the brain and spinal cord) become sensitised, amplifying pain responses. In others, the problem lies within the spinal cord or brain itself, where maladaptive pain circuits are reinforced over time. Conditions like arthritis, sciatica, failed back surgery syndrome, fibromyalgia, and neuropathic pain syndromes are all common culprits.
Conservative treatments like physiotherapy, oral anti-inflammatories, antidepressants, anticonvulsants, or injections are often tried first. However, for many people, these options provide only partial relief. This is where interventional treatments like nerve ablation enter the picture as a next step in the pain management ladder.
What is nerve ablation?
Nerve ablation, also called neurotomy or radiofrequency ablation (RFA), is a minimally invasive technique designed to interrupt the transmission of pain signals. It works by applying focused energy to pain-conducting sensory nerves using a needle-like probe guided to the target under imaging.
The goal is not to destroy the entire nerve, but to selectively disable the small-diameter fibres (C-fibres and A-delta fibres) that are most responsible for transmitting slow, burning, or aching pain. Importantly, this leaves larger motor fibres intact, preserving strength and movement.
There are three main types of radiofrequency ablation used in clinical practice:
- Continuous (thermal) RF: This technique heats the nerve tip to around 80–90 °C for up to 120 seconds. The intense heat creates a defined thermal lesion that blocks the nerve’s ability to send pain signals.
- Pulsed RF: This form delivers intermittent high-voltage pulses that limit the tissue temperature to around 42–45 °C. It modulates the nerve’s function rather than destroying it, often used near sensitive or mixed-function nerves.
- Cooled RF: This newer approach uses internal water cooling to create larger lesions without burning or charring the tissue. It’s particularly effective for treating larger nerves like the genicular nerves in the knee or sacroiliac region.
It’s important to note that nerve ablation is different from nerve blocks, which involve temporarily numbing a nerve with a local anaesthetic. Ablation aims for longer-term disruption of the pain pathway.
Who might benefit?
Nerve ablation is not suitable for every type of chronic pain, but it is particularly effective for conditions where a clear source of pain can be localised to a specific sensory nerve. Common indications include:
Facet joint pain – often due to spinal arthritis in the neck or lower back. This is one of the most evidence-supported uses of RF ablation.
Chronic knee pain – especially from osteoarthritis when surgery is not suitable or desired.
Trigeminal neuralgia – a condition that causes sudden facial pain due to nerve compression or irritation.
Sacroiliac joint pain – pain at the base of the spine, often misdiagnosed but treatable with cooled RF techniques.
Before undergoing nerve ablation, most patients receive a diagnostic nerve block. This temporary injection helps confirm that the targeted nerve is the actual source of their pain. A good response (typically 50% or greater temporary relief) indicates they are likely to benefit from ablation.
Inside the procedure room
Nerve ablation is typically performed in an outpatient clinic or day surgery setting under sterile conditions. The procedure is quick—often less than 30 minutes—and does not require general anaesthesia. Most patients go home the same day.
First, the skin is cleaned and numbed with a local anaesthetic. Using either fluoroscopy (real-time X-ray) or ultrasound, the doctor guides a fine cannula or electrode to the precise location near the nerve. Once in place, a small electric stimulation is applied to confirm the position by reproducing a mild tingling or tapping sensation.
Once the position is verified, energy is delivered through the probe according to the chosen protocol. You might feel warmth or mild pressure, but it’s not typically painful. Some centres offer mild sedation for comfort, but this is not always necessary. After the procedure, you’ll rest briefly in recovery and then be discharged with instructions for resuming normal activity—usually within 24 hours.
How pain relief occurs
The targeted application of radiofrequency energy disrupts the nerve’s ability to send pain signals to the brain. In thermal ablation, the heat denatures structural proteins within the axon, causing it to degenerate—a process known as Wallerian degeneration. In pulsed RF, the electric fields alter the nerve’s electrical signalling and reduce inflammation around the nerve sheath.
The benefit is that ablation can reduce or even eliminate pain without removing or damaging the entire nerve structure. Because the nerve’s surrounding connective tissue remains intact, motor function is preserved, and the body has the ability to slowly regrow the sensory nerve over time—making the treatment effective but not necessarily permanent.
Evidence for effectiveness
Multiple well-designed studies support the use of nerve ablation, especially for spinal and joint-related pain. According to Pain Medicine journal, approximately 63–66% of patients with confirmed facet-mediated pain experience at least a 50% reduction in pain lasting up to two years [6][7].
For osteoarthritis-related knee pain, cooled RF ablation of genicular nerves has shown promising results. Clinical trials have demonstrated that most patients report improved pain relief, mobility, and reduced need for analgesics for 10 to 24 months after treatment [5].
The success of the procedure depends heavily on correct patient selection, image-guided targeting, and post-procedural care. When done properly, it can be an excellent option for those looking to avoid surgery or reduce reliance on medication.
Duration, repeatability and safety
Most patients begin to notice improvement in their pain within 2 to 4 weeks after the procedure. Relief typically lasts 6–12 months for conventional RF and 12–24 months for cooled RF applications. Nerves regenerate at a rate of about 1 millimetre per day, so eventually the nerve may regain full function—at which point the procedure can be safely repeated.
Repeat ablations are common and often just as effective as the first. In some cases, patients experience longer-lasting relief the second time, especially if inflammation or mechanical stress in the area has improved.
Radiofrequency ablation has a low complication rate. Minor side effects like temporary soreness, numbness, or mild swelling at the site are the most common. Serious risks like infection, bleeding, or nerve damage are rare and minimised when performed by experienced professionals using imaging guidance.
How ablation fits among other interventional options
Nerve ablation fits between conservative pain management strategies and more invasive treatments like implantable devices or surgery. For instance:
Epidural steroid injections can reduce inflammation and pain but usually provide only 2–8 weeks of relief [1].
Facet joint injections can relieve pain for up to 3–6 months, but effects often wear off faster than ablation [2].
Spinal cord stimulation (SCS) involves surgically implanting a pulse generator and electrodes. It offers long-term relief for some patients but carries higher costs and risks [3].
Knee or hip replacement surgery is a major intervention with long recovery periods, but it may be necessary for severe joint degeneration. In contrast, ablation is less invasive and can be repeated if needed without precluding future surgery [4].
Technology matters
Modern radiofrequency systems have come a long way. Devices like the Diros OWL® URF-3AP offer precision control, real-time temperature feedback, and the ability to ablate multiple sites simultaneously. This ensures consistent results while reducing procedure time and improving safety. These advancements make RF ablation more predictable and customisable to each patient’s anatomy.
Frequently asked questions
Will I be awake? Yes, most procedures are done under local anaesthetic. You may be lightly sedated, but general anaesthesia is rarely needed.
Does it hurt? Most people feel only a pressure or warmth. The area is numbed beforehand, and the procedure itself is usually well tolerated.
Is it permanent? No, the nerve can regrow over time, but relief can last months or even years. Many people repeat the procedure when needed.
Is it covered? Yes, most health systems and private insurers cover RFA after conservative treatment fails. Always check with your provider.
Key takeaway
Nerve ablation is a safe, evidence-based procedure that can significantly reduce chronic pain and improve quality of life for patients who haven’t responded to more conservative measures. While not a cure, it can offer months or even years of relief without surgery or heavy medication. If you’re living with chronic pain and looking for options, ask your doctor whether nerve ablation could be a step forward in your treatment plan.
References
- American Academy of Neurology. Systematic review of epidural steroids for radicular pain and spinal stenosis, Neurology 2025 (verywellhealth.com).
- Hospital for Special Surgery. “Facet Joint Injection—Health Library”, 2024 (hss.edu).
- Sdrulla AD et al. Pain Practice 2018;18:1048–1067—5‑year SCS outcomes (pmc.ncbi.nlm.nih.gov).
- NIHR. “Knee replacements last 25 years in >80% of cases”, 2019 (evidence.nihr.ac.uk).
- Health.com. “What to Know About Nerve Ablation”, 2024 (health.com).
- Conger A et al. “Effectiveness of Medial Branch RFA”, Pain Medicine 2020 (pubmed).
- Provenzano DA et al. “Real-world RFA Outcomes at 24 Months”, Regional Anesthesia & Pain Medicine 2025 (sciencedirect.com).