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Per-claim provenance."}],"not_medical_advice":true},"slug":"facet-joint-syndrome","title":"Facet joint pain: the threshold that defines it was set in a workshop","register":"accessible","tags":[],"updated_at":"2026-08-05T09:19:48.793Z","body_excerpt":"At the back of every level of your spine sit two small joints, one on each side, linking each vertebra to the one below. They are ordinary synovial joints — cartilage, capsule, lubricating fluid — and like every other joint of that kind they wear, they get arthritic, and they can hurt.\n\nThe pain they produce has a shape. It is worse leaning backwards and worse twisting, because both movements load and compress them. It eases leaning forward, which opens them. It sits low in the back, often to one side, and can refer into the buttock and the back of the thigh — but it stops above the knee, which is the line that separates it from a nerve root problem.\n\nThat is the clinical picture. The problem with this condition is not describing it. The problem is proving it.\n\n## Why nobody can diagnose this from a scan\n\nFacet joints look arthritic on imaging in enormous numbers of people, including people with no back pain at all — the same trap that runs through spinal stenosis and rotator cuff findings. Arthritic facets on a report tell you the person has a spine of a certain age.\n\nBecause the picture cannot settle it, the field settled on a functional test instead: anaesthetise the small nerve branches that supply a specific joint and see whether the pain goes. If it does, that joint was the source. If it does not, it was not.\n\nThis is where the honest difficulty of the field lives, and a 2021 guideline development workshop shows it. Of the criteria the group considered mandatory for selecting patients, one needed defining outright: what counts as a positive response to a diagnostic block.\n\n[[embed:source:s1]]\n\nThey settled on at least 60% pain relief.\n\nSit with that. The threshold defining whether a person has this condition was, as recently as 2021, a thing that had to be agreed in a workshop rather than something the evidence supplied. That is not a scandal — it is a fair description of how diagnosis works when the picture and the symptoms do not line up — but it should shape how much confidence anyone puts in the label.\n\n## What predicts whether the block will work\n\nIf the diagnostic block is the gateway, it is worth knowing who responds to it. A 2026 study compared responders with non-responders and found the difference was not primarily about the joints themselves.\n\n[[embed:source:s2]]\n\nResponders were younger and had lower body mass index, and specific measures of pelvic and spinal alignment were associated with a negative response. The authors suggest adding biomechanical assessment to patient selection.\n\nThe useful reading: if your spine and pelvis sit in a particular alignment, your back pain is less likely to be coming purely from a facet joint, and a block is less likely to give you the answer you were hoping for. It is a reason to have the alignment looked at before agreeing to a diagnostic procedure.\n\n## Burning the nerve: what it does, and how confident anyone should be\n\nIf blocks confirm the joint is the source, the usual next step is radiofrequency denervation — heating the small nerve branches so they stop carrying pain signals from that joint. The nerves regrow, so the effect is measured in months to a couple of years.\n\nA 2026 systematic review of the whole field gives the fairest summary available.\n\n[[embed:source:s3]]\n\nSmall improvements in pain and function against sham, on low to moderate certainty evidence. Not nothing, and not a solution.\n\nThat word \"sham\" matters here more than in most procedures. A sham-controlled comparison is the only way to separate the effect of the treatment from the effect of having a procedure, and procedures produce large expectation effects. Small improvements over sham means small improvements over the considerable benefit of being treated at all.\n\nPractice reports look better than that, and it is worth understanding why. A prospective series found significant reductions in back pain, radiating pain and disability against the patients' own baseline, plus reduced painkiller use.\n\n[[embe","ranking":"safety-first (interaction_risk/limitations), then quote-gated effective_weight","claims":[{"id":"c1","text":"Facet joint pain cannot be diagnosed from a scan, so the diagnosis rests on the response to a diagnostic block.","tier":"expert","interaction_risk":false,"status":"active","source_ids":["s1","s3"],"source_status":"sourced","why_material":"It explains why patients are offered a needle before an answer, and why an arthritic-looking facet on imaging is not the diagnosis.","retracted_at":null,"retraction_reason":null,"challenged_by":[],"effective_weight":0.1,"quote_gated":false},{"id":"c2","text":"Spinopelvic alignment is an associated factor in short-term response, so what predicts whether the block works is measurable in advance.","tier":"observational","interaction_risk":false,"status":"active","source_ids":["s2"],"source_status":"sourced","why_material":"It converts the block from a coin-flip into something with a prior, which is worth knowing before agreeing to a diagnostic procedure.","retracted_at":null,"retraction_reason":null,"challenged_by":[],"effective_weight":0.1,"quote_gated":false},{"id":"c3","text":"Radiofrequency denervation of the lumbar facet joints has both guideline development work and systematic review evidence behind it, and the confidence attached to it is moderate rather than high.","tier":"rct","interaction_risk":false,"status":"active","source_ids":["s1","s3","s4"],"source_status":"sourced","why_material":"Stating the strength of the evidence rather than only its direction is what lets someone weigh a procedure that burns a nerve.","retracted_at":null,"retraction_reason":null,"challenged_by":[],"effective_weight":0.1,"quote_gated":false},{"id":"c4","text":"Cryoneurolysis has been compared against radiofrequency ablation in a randomised trial, and glucocorticoid facet joint injection is the subject of a Cochrane protocol rather than settled evidence.","tier":"rct","interaction_risk":false,"status":"active","source_ids":["s5","s6"],"source_status":"sourced","why_material":"It places the two alternatives accurately: one has a head-to-head trial, the other has a review still in progress, and neither is established.","retracted_at":null,"retraction_reason":null,"challenged_by":[],"effective_weight":0.1,"quote_gated":false}],"sources":[{"id":"s1","type":"pubmed","url":"https://pubmed.ncbi.nlm.nih.gov/34377456/","title":"Radiofrequency denervation of the lumbar facet joints: guidelines for the RADICAL randomised controlled trial","quote":"Three were agreed as mandatory criteria but required further clarification, one of which involved defining a positive response to a diagnostic medial branch block as ⩾60% pain relief.","summary":"British Journal of Pain 2021: a guideline workshop on selecting patients for facet denervation. 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Small improvements against a sham procedure — which is the comparison that isolates what the heating itself contributes.","claim_ids":[],"hash":"15a0b18b9ad112baa6357baf82b27c8b44670eeb4ea0e3029ff49e6d150171c2"},{"id":"s4","type":"pubmed","url":"https://pubmed.ncbi.nlm.nih.gov/33447672/","title":"Prospective analysis of radiofrequency denervation in patients with chronic low back pain","quote":"Moreover, a statistically significant reduction in pure low back pain, radiating pain and in the ODI in the short to medium term was observed with respect to baseline.","summary":"Journal of Spine Surgery 2020: a prospective series showing significant improvement against patients' own baseline, plus reduced painkiller use. 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