Genicular nerve radiofrequency ablation treats knee osteoarthritis pain by interrupting the sensory nerves that carry it, rather than by altering the joint. Several randomized controlled trials have demonstrated its superiority over intra-articular steroid, viscosupplementation and oral analgesics.1 That comparison matters, because those three are usually what has already been tried by the time anyone raises ablation.
What is actually being targeted
The genicular nerves are sensory branches supplying the knee capsule. Ablating them reduces the pain signal without touching cartilage, ligament or bone — the arthritis is unchanged, but its transmission is interrupted.
This is worth being clear about with patients. It is a pain treatment, not a joint treatment, and it does not restore cartilage or reverse the underlying osteoarthritis.
Why the targets are debated
Cadaveric studies demonstrate significant variability in the location of the genicular nerves, which has stimulated debate about the ideal target locations for ablation.1 Anatomy here is not uniform from person to person, so the technique is not a matter of hitting fixed coordinates.
Despite that variability, favorable outcomes have been observed in studies targeting only the superior medial, inferior medial and superior lateral genicular nerves.1 Targeting additional sensory nerves may further improve treatment success, though that remains an open question rather than settled practice.1
How it compares with what you have probably already tried
Genicular ablation of those three nerves appears to be an effective treatment for painful knee osteoarthritis.1 The randomized evidence showing superiority over intra-articular steroid injection, viscosupplementation and oral analgesics is the practical argument for considering it when those have not held.1
The comparators are described here under viscosupplementation for the knee, and the ablation itself under genicular radiofrequency ablation.
The diagnostic block comes first
Ablation is generally preceded by a diagnostic genicular nerve block, which anesthetizes the same nerves temporarily. If the block does not relieve the pain, ablating those nerves is unlikely to either — which is precisely the information worth having before committing to a longer-lasting procedure.
On safety, stated honestly
Genicular ablation appears relatively safe on the basis of available data, but the authors are explicit that additional large-scale studies are needed to provide greater confidence.1 That is a fair summary to carry into a decision: encouraging evidence, not a closed question.
Frequently asked questions
Does genicular ablation fix the arthritis in my knee?
No. It interrupts the sensory nerves carrying pain from the joint; the arthritis itself is unchanged. Related joint-directed options are described under viscosupplementation for the knee.
How does it compare with a steroid injection or gel injection?
Several randomized controlled trials have shown genicular ablation to be superior to intra-articular steroid, viscosupplementation and oral analgesics for painful knee osteoarthritis. See genicular radiofrequency ablation.
Why do I need a nerve block before the ablation?
Because it tests the target. A temporary block of the same nerves indicates whether interrupting them relieves your pain, before a longer-lasting procedure is performed. See genicular nerve block.
Are the nerves in the same place in everyone?
No, and that is a genuine technical issue. Cadaveric studies show significant variability in genicular nerve location, which is why ideal target sites remain debated even though outcomes targeting three specific nerves have been favorable. Image guidance is described under ultrasound-guided and fluoroscopic procedures.
Is it safe?
Available data suggest it is relatively safe, though the authors of the current evidence review call for larger studies before stronger claims are made. To discuss whether it suits your knee, use the appointment request form.
To have knee pain evaluated, request an appointment, call (314) 481-5000, or text (314) 886-5902.
Sources
- Conger A, Gililland J, Anderson L, Pelt CE, Peters C, McCormick ZL. Genicular Nerve Radiofrequency Ablation for the Treatment of Painful Knee Osteoarthritis: Current Evidence and Future Directions. Pain Medicine. 2021;22(Suppl 1):S20–S23. doi:10.1093/pm/pnab129. Retrieved via PubMed. DOI
Dr. Gurpreet Singh Padda, MD, MBA, MHP
