Burning the Nerves That Carry Chronic Joint and Back Pain

What radiofrequency ablation actually does

Radiofrequency ablation places a thin needle next to a specific nerve, under image guidance, and passes a current through its tip until the heat interrupts that nerve's ability to carry a pain signal. The joint is untouched. The cartilage, the disc, the arthritis on the X-ray — all of it stays exactly as it was. What changes is the wiring that reports the problem.

Denervation is the general word for interrupting a nerve's signal. Ablation is one way of doing it, using heat rather than a scalpel.

The nerves chosen are small sensory branches near a joint. In the spine, the usual targets are the nerves supplying the facet joints — the small paired joints at the back of each vertebral level. At the sacroiliac joint, the targets are a different set of branches. At the knee, they are the nerves running around the joint, and the procedure is called genicular nerve ablation. Same tool, different anatomy, different question.

Why "does radiofrequency ablation work" has no single answer

Because it is not one operation. An ablation aimed at the nerves behind the spine, an ablation aimed at the branches supplying the sacroiliac joint, and genicular nerve ablation aimed at the knee are three different procedures with three different evidence bases, three different selection rules, and three different failure modes. A result from one does not transfer to another.

So when a friend says ablation changed their life, and a stranger online says it did nothing, both may be reporting accurately about different procedures done for different reasons in different people. The word is shared; the intervention is not.

What is documented at the level of whole health systems is broader and less comfortable. Low-value care for low back pain — unnecessary imaging, opioids, injections, and surgery — is widespread globally, and reducing it is a stated priority 1Ref 1Buchbinder R, van Tulder M, Öberg B, et al. (2018).Low back pain: a call for action.The claim that low-value care for low back pain — including unnecessary imaging, opioids, injections, and surgery — is widespread globally and should be reduced, used here as base-rate context rather than a verdict on any individual procedure.. That is not a verdict on any individual's ablation, and it is not an argument that the procedure never helps. It is a statement about the base rate: a great many needles go into a great many backs for reasons the evidence does not support, which is exactly why the reasoning behind a specific offer matters more than the reputation of the procedure in general.

What has to be true before an ablation makes sense

The logic of ablation depends entirely on one prior step: somebody has to have shown that the nerve being burned is the nerve carrying the pain. That is what a diagnostic block is for — numbing medicine placed at the same target, to see whether the pain goes quiet. If it does not, ablating that nerve is burning the wrong wire.

The sacroiliac joint is the clearest published example of this reasoning. It is a source of chronic low back pain in a substantial minority of people whose pain does not radiate down a leg, and it cannot be identified from imaging alone — diagnosis rests on provocation tests and diagnostic anesthetic blocks, and initial management is conservative 2Ref 2Cohen SP, Chen Y, Neufeld NJ (2013).Sacroiliac joint pain: a comprehensive review of epidemiology, diagnosis and treatment.That the sacroiliac joint is a source of chronic low back pain in roughly 15-30% of people with non-radicular pain, that diagnosis rests on provocation tests and diagnostic anesthetic blocks rather than imaging alone, and that initial management is conservative..

The sacroiliac joint is a source of chronic low back pain in roughly 15 to 30 percent of people with non-radicular pain 2Ref 2Cohen SP, Chen Y, Neufeld NJ (2013).Sacroiliac joint pain: a comprehensive review of epidemiology, diagnosis and treatment.That the sacroiliac joint is a source of chronic low back pain in roughly 15-30% of people with non-radicular pain, that diagnosis rests on provocation tests and diagnostic anesthetic blocks rather than imaging alone, and that initial management is conservative..

That number cuts both ways. It is high enough that the joint is worth considering seriously, and low enough that assuming it without a block is a coin toss dressed as a diagnosis.

A diagnostic block is also not the same thing as a therapeutic one, though the two blur together in conversation and on the bill. Facet joint injections deliver steroid in the hope of treating; a block delivers anesthetic in order to answer a question. Worth asking which one is being proposed, and what result would count as an answer — because a block that does not relieve the pain has told you something useful, not failed.

The care that comes first, and what it is actually worth

Guidelines put non-drug care first, with reasons attached. The American College of Physicians recommends non-pharmacologic treatment — heat, exercise, massage, spinal manipulation — first for acute and subacute low back pain, and exercise, multidisciplinary rehabilitation, and other non-drug therapies for chronic low back pain, with NSAIDs as the first-line drug when a drug is used 3Ref 3Qaseem A, Wilt TJ, McLean RM, Forciea MA (American College of Physicians) (2017).Noninvasive Treatments for Acute, Subacute, and Chronic Low Back Pain: A Clinical Practice Guideline From the American College of Physicians.The specific first-line recommendations: non-pharmacologic treatment (heat, exercise, massage, spinal manipulation) first for acute and subacute low back pain; exercise, multidisciplinary rehabilitation, and other non-drug therapies for chronic low back pain; NSAIDs as first-line drug therapy..

The honest version of that recommendation includes the size of the effects, which are real and modest rather than transformative:

• Exercise therapy probably reduces pain and improves function in chronic non-specific low back pain compared with no treatment, usual care, or placebo, with small-to-moderate effects 4Ref 4Hayden JA, Ellis J, Ogilvie R, Malmivaara A, van Tulder MW (2021).Exercise therapy for chronic low back pain.That exercise therapy probably reduces pain and improves function in chronic non-specific low back pain compared with no treatment, usual care, or placebo, with small-to-moderate effects..
• NSAIDs are slightly more effective than placebo for short-term pain and disability in chronic low back pain, but the effect is small and may not be clinically important 5Ref 5Enthoven WTM, Roelofs PDDM, Deyo RA, van Tulder MW, Koes BW (2016).Non-steroidal anti-inflammatory drugs for chronic low back pain.That NSAIDs are slightly more effective than placebo for short-term pain and disability in chronic low back pain, but the effect is small and may not be clinically important..
• For the knee, where genicular ablation is offered, the largest lever in the trial evidence is not a needle at all. In overweight and obese adults with knee osteoarthritis, intensive diet-induced weight loss combined with exercise produced greater reductions in pain and inflammation and better function than exercise alone, and reduced the compressive load travelling through the knee 6Ref 6Messier SP, Mihalko SL, Legault C, et al. (IDEA) (2013).Effects of Intensive Diet and Exercise on Knee Joint Loads, Inflammation, and Clinical Outcomes Among Overweight and Obese Adults With Knee Osteoarthritis: The IDEA Randomized Clinical Trial.That in overweight and obese adults with knee osteoarthritis, intensive diet-induced weight loss combined with exercise produced greater reductions in pain and inflammation and better function than exercise alone, and reduced knee compressive loads..

Conservative care is not a waiting room you sit in to qualify for the procedure. Its effects are measurable and its trials are real — which is why skipping it, then calling it failed, changes the meaning of everything that comes after.

The same argument, with different evidence, runs through hip arthroscopy for fai, subacromial decompression, and lumbar fusion for back pain — each with its own literature, none of it a general rule you can carry over.

Why feeling better afterward does not prove the nerve was the problem

Pain that is bad enough to justify a procedure is usually pain at its worst. People book procedures at their peak, and peaks tend to be followed by something less bad, whatever is done in between. Add the natural course of the condition, the numbing medicine used during the procedure itself, and the ordinary effect of being taken seriously by a clinician, and improvement after an ablation has several possible authors.

Regression to the mean is the statistical name for the first of those. Measure anything at its extreme, measure it again later, and it will usually sit closer to average — no treatment required.

None of this means ablation does nothing. It means a single person's improvement, however dramatic, cannot separate the procedure from the four other things that were happening at the same time. Only a comparison against a sham can do that, which is why the trial literature in this field is contested and why reading it carefully is worth more than reading testimonials.

Questions worth asking before scheduling one

The point of these is not to argue with the clinician offering the procedure. It is to find out whether the reasoning behind the offer is specific to you or generic to the schedule. A clinician who has thought carefully about your case will have ready answers, and will not mind being asked; one who has not will find the questions clarifying too.

• Which nerve, specifically, and why that one? The answer should name anatomy and connect it to the pattern of your pain, not to your MRI report alone.
• Was a diagnostic block done, what happened, and how was "it worked" defined? A vague "it helped some" is not a threshold.
• What would count as success here, and when will we check? Agreed in advance, in writing if possible.
• What is the plan if it does not work? A repeat, a different target, or a different direction entirely — the answer tells you how confident the reasoning underneath really is.
• What has not been tried yet, and why was it skipped? If a genuine course of rehabilitation is missing from the history, that is worth knowing before a needle enters the conversation.
• What is the full radiofrequency ablation cost, itemised? The professional fee and the facility fee are commonly billed separately, so a single quoted number may not be the number that arrives.

When the problem is structural, and the conversation changes

Ablation treats a pain signal. Some problems are not pain signals. Progressive weakness in a leg or arm, numbness in the groin or inner thighs, a change in bladder or bowel control, or a foot that has started to drop are signs that a nerve is being compressed rather than merely irritated — and no amount of interrupting the signal addresses the compression. Those situations need imaging and a surgical opinion, promptly.

Sequence of care is a rule about order, not a rule against procedures. There are people for whom an ablation is a reasonable, well-reasoned next step: pain localised to one region for months, a plausible pain generator confirmed by a block that actually relieved it, a genuine trial of exercise and rehabilitation already behind them, and no structural lesion that a needle was never going to reach. Withholding the procedure from that person on the principle that conservative care is always better would be the same error in the opposite direction — a rule applied instead of a judgment made.

The question is never "procedure or no procedure." It is whether this procedure, aimed at this nerve, in this person, at this point in the sequence, has a reason behind it that survives being said out loud.