Endoscopic Facet Joint Rhizotomy

Each facet joint is supplied by a small nerve twig called the medial branch, which carries sensation — including pain — from that joint. When a facet joint becomes arthritic and painful, that pain is signalled along these medial branch nerves. This "facetogenic" pain is typically a deep, aching back pain, often worse on standing, bending backwards or twisting, and it can be difficult to distinguish from other causes without careful assessment. The key to treating it well is proving that the facet joints really are the source — usually with diagnostic medial branch blocks, small test injections that temporarily numb those nerves. Only if the pain reliably switches off with the test does a rhizotomy make sense.

A rhizotomy interrupts the medial branch nerves so they can no longer carry pain from the worn joint. The long-established way to do this is radiofrequency denervation — heating the nerve through a needle placed under x-ray guidance. The endoscopic approach takes this a step further: through a small portal, the endoscope is passed to the exact spot where the medial branch runs, and the nerve is identified and ablated under direct, magnified vision rather than relying on x-ray landmarks alone. The rationale is that seeing the nerve should allow a more complete and precisely targeted interruption, which may translate into more durable relief. The procedure spares the joint itself and the surrounding structures.

I am candid with patients about what a rhizotomy is and is not. It is a treatment for pain, not a cure for the arthritis in the joint — it quietens the nerve that signals the pain, but it does not repair the joint. The medial branch nerves can, over time, regrow, so the relief, while it can last many months to a couple of years, is not always permanent, and the procedure can be repeated. Its success depends almost entirely on getting the diagnosis right beforehand: rhizotomy works well when the facet joints are genuinely the pain source and poorly when they are not, which is why I place such emphasis on the diagnostic blocks. Setting these expectations honestly is part of doing the procedure properly.

The evidence base has two parts. For conventional radiofrequency medial branch neurotomy, there is good-quality evidence — including randomised trials, systematic reviews and meta-analyses — that, in well-selected patients confirmed by diagnostic blocks, it provides meaningful relief of facet-mediated low back pain. The endoscopic-visualised technique is newer: systematic reviews and cohort studies of endoscopic rhizotomy report it to be safe and effective for facetogenic pain, and some comparative work suggests a longer duration of relief than conventional radiofrequency, plausibly because the nerve is ablated under direct vision. In the interest of balance, a multicentre comparative trial did not find endoscopic denervation clearly superior to radiofrequency or cryoablation at two years — so I present it as a refined option within a well-established treatment, not a miracle cure, and always contingent on careful selection.

Endoscopic facet rhizotomy is a day-case, minimally invasive procedure. Most people go home the same day with a small dressing, and relief of the back pain typically settles in over the following days to weeks as the treated nerves quieten. Because the procedure targets pain rather than repairing the joint, the benefit is measured in months to a couple of years and can be repeated if the pain returns. As always, the plan is individualised, and it follows a careful diagnostic work-up.

• —Full-endoscopic rhizotomy for degenerative lumbar facet joint syndrome: systematic review and meta-analysis. (PMC13066666)
• —Evaluation of endoscopic dorsal ramus rhizotomy in managing facetogenic chronic low back pain. (PMID 25194305)
• —Endoscopically guided foraminal and dorsal rhizotomy for chronic axial back pain: anatomic and clinical study. (PMID 25694936 / PMC4325504)
• —Comparative effectiveness of radiofrequency ablation, cryoablation, and endoscopic denervation for lumbar facet pain: multicentre trial. (PMC12685308)
• —van Kleef M, et al. Randomized trial of radiofrequency lumbar facet denervation for chronic low back pain. (PMID 10515020)
• —Efficacy of conventional radiofrequency denervation for facet-joint chronic low back pain: meta-analysis of RCTs. (PMID 28576500)