Genicular radiofrequency ablation gives longer-lasting knee pain relief. It is for people who cannot have, or do not want, a knee replacement.
What is genicular radiofrequency ablation?
Once genicular blocks (numbing shots) have confirmed the target, radiofrequency energy is used to interrupt those sensing nerves. The joint itself is not touched. Only its pain supply is treated.
What we use it for
- Confirmed knee osteoarthritis pain after positive genicular blocks
- Patients who are not fit for, or do not want, joint replacement
- Pain that lasts after knee replacement
What should I expect from genicular nerve ablation?
- 30 to 45 minutes under image guidance.
- A sore knee for one to two weeks afterward is normal.
- Relief usually starts at two to three weeks.
- No sedation; most patients drive themselves home.
What is the downside of knee ablation?
For the knee: numbness over parts of the knee is expected. It is the intended effect on the sensing nerves. Soreness at the three treatment sites lasts one to two weeks. The procedure removes the warning feeling from part of the joint capsule. So do not take the lack of pain as permission to overload a damaged knee. Skin burns are a theoretical risk at the entry points. Correct grounding and technique prevent them.
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How we judge whether it worked
This treats pain, not the joint. That difference is the whole talk we have with patients weighing it against replacement. The mechanical problem does not change, and the knee is not being repaired.
For someone not fit for surgery, not willing to have it, or wanting to put it off, that trade is often clearly worth it. For someone with a good surgical option and nothing in the way, usually less so.
Before and after your procedure
No sedation is used, so most patients drive themselves home. Expect soreness at the three treatment sites for one to two weeks and numbness over parts of the knee, which is the intended effect. Take care on stairs while the feeling is changed. Most important: do not take the lack of pain as permission to overload the knee. The joint has not changed, and the warning signal is weaker.
How is genicular nerve ablation done?
Where genicular blocks have confirmed the nerves as the source, radiofrequency energy makes small heat lesions (tiny treated spots) along the same targets. This interrupts pain signals from the joint capsule for far longer than anesthetic can. The procedure is done under ultrasound or fluoroscopic (live X-ray) guidance. It takes longer than the diagnostic block because each site is treated in turn.
Who is a good candidate for genicular nerve ablation?
It suits knee osteoarthritis in patients who got good but short-term relief from genicular blocks. It also suits patients who are not fit for, or do not want, joint replacement, and pain that lasts after a replacement. It does not restore mechanical function. A knee that gives way or locks needs a different talk. And it does not slow the arthritis underneath.
Preparing for the appointment
Bring current imaging on a disc or through a portal. Bring a full medication list, including anything from another prescriber and any blood thinners. Bring a note of previous injections and how long each one helped. Blood thinners in particular may need planning, so tell us ahead of time, not on the day.
Common questions
Does this replace a knee replacement?
No. It treats pain, not the mechanical joint problem. For people who cannot have surgery, or who want to put it off, it is still very useful.
How long does it last?
Often six to twelve months, as the nerves grow back. After that it can be repeated.
Does it fix the arthritis?
No. It interrupts pain signals from the joint. The structural changes stay the same. That is why function and strength work go on alongside it.
Can I still have a knee replacement later?
Yes. This does not rule out surgery. It is often used to put surgery off, or to manage pain in people who cannot have it.
How long does it take to recover from genicular nerve ablation?
Plan on one to two weeks of soreness at the three treatment sites. Parts of the knee will feel numb. That numbness is the intended effect on the sensing nerves. Relief usually starts two to three weeks after the procedure. No sedation is used, so most patients drive themselves home that day. Take care on stairs while the sensation is altered.
How effective is genicular nerve ablation?
It works best when genicular blocks have already given you good but temporary relief, because that proves those nerves carry your pain. Relief then lasts far longer than a numbing block, often six to twelve months. The treatment can be repeated as the nerves regrow. It treats the pain, not the joint, so strength and function work go on alongside it.
Sources
- Kim PY et al. Genicular Nerve Blocks and Radiofrequency Ablation for Knee Osteoarthritis: More Nerves, More Questions. Pain medicine (Malden, Mass.), 2021. PubMed 33538816
- Soetjahjo B et al. The Analgesic Effectiveness of Genicular Nerve-targeted Cooled and Pulsed Radiofrequency Ablation for Osteoarthritis Knee Pain: A Systematic Review and Meta-analysis. Pain physician, 2024. PubMed 39353105
- Cohen SP et al. Emperor’s nakedness exposed: unmasking fairytales for genicular nerve radiofrequency ablation in knee osteoarthritis. Regional anesthesia and pain medicine, 2023. PubMed 36963771
- Rambhia M et al. Ultrasound-guided genicular nerve blocks following total knee arthroplasty: a randomized, double-blind, placebo-controlled trial. Regional anesthesia and pain medicine, 2021. PubMed 34261807
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