Back Pain That Gets Worse When You Arch and Twist: What Facet Joints Actually Do

What this video covers

• Why facet (zygapophyseal) joints hurt: capsular stretch, synovitis, cartilage loss, medial branch innervation
• Intra-articular facet injection versus medial branch block, and why a diagnostic block should contain local anesthetic only
• Why imaging cannot make this diagnosis, and why a single positive block is wrong half the time
• What the randomized evidence shows about steroid inside the joint, and why no cited trial establishes a duration
• The named risks, the off-label status of corticosteroid, and why a block is a test rather than a treatment
• MEDICAL DISCLAIMER: This content is for educational purposes only and is not medical advice. It does not substitute for professional diagnosis or treatment. Always consult a licensed healthcare provider regarding your condition. Viewing this video does not establish a doctor-patient relationship.

You reach for the upper shelf and arch backward. Not bending, not lifting — arching, and twisting. The pain sits in a band across your low back and does not run down your leg. It is worse the longer you stand, worse straightening out of a chair, worse walking downhill, where your spine holds extension the whole way.

Then a radiology report came back reading multilevel facet arthropathy, degenerative changes — and maybe you were injected on the strength of that phrase, without anyone explaining what it did and did not mean.

That pattern raises suspicion. It does not make the diagnosis. This article explains what the facet joints are, why they produce exactly that band of pain, why no scan and no exam maneuver can confirm they are the source, and what an actual diagnostic test looks like.

What a facet joint is, and why it hurts

The zygapophyseal joints — the facets — are the paired joints at the back of the spine, one on each side, that link each vertebra to the one above and below. They are true synovial joints: cartilage on paired surfaces, a synovial membrane, a fluid-filled space, and a fibrous capsule that is richly supplied with nerves.

That construction is why they can hurt. Cartilage thins. The capsule stiffens. The synovium inflames. The joint then hurts under load — and the load that matters here is not bending forward or lifting. It is extension and rotation: arching closes those joint surfaces against each other, and rotation shears them.

Now the anatomy that governs everything that follows. Each lumbar facet joint is supplied by two nerves — medial branches of the dorsal rami, one arriving from the level above and one from the joint’s own level. They cross a predictable landmark: the junction where the superior articular process meets the transverse process, running under the mamillo-accessory ligament.

There is one important exception at the bottom of the lumbar spine. The L5-S1 joint still takes two nerves, but the lower one is not a medial branch at all — it is the L5 dorsal ramus itself, sitting at the junction of the sacral ala and the S1 superior articular process, paired with the L4 medial branch above. Two targets still, one of them differently named and in a different place. Numb one nerve and you learn nothing about the joint; both have to be silenced for the test to mean anything.

Why that anatomy produces the symptom you actually feel

Every part of the pattern you recognize traces back to joint mechanics.

• Worse arching to a high shelf. Extension closes the posterior joint surfaces. The capsule and the inflamed synovium are loaded directly.
• Worse standing still at a counter. Standing holds a degree of lumbar extension continuously, so the load never comes off.
• Worse straightening up out of a chair. That movement takes the spine from flexion into extension under body weight.
• Worse walking downhill. Going downhill keeps the lumbar spine in extension for the entire descent.
• A band across the low back, not down the leg. The facet joints and their capsules are axial structures. When they are the pain generator, the pain is axial. Pain running below the knee with numbness or weakness points to a different structure — and that is a different evaluation.

This is also why bending forward to tie a shoe is often not the movement that hurts. What loads these joints is not bending and not lifting. It is arching and twisting.

Why the MRI report is not the diagnosis

Here is the part that is rarely read back to patients carefully. A report describing facet arthrosis or degenerative changes is describing what your joints look like at your age — not that those joints are producing your pain. Age-related facet arthrosis appears on a large share of scans and correlates poorly with who actually hurts.

No scan finds this diagnosis. No exam maneuver finds it either — not extension-rotation testing, not paraspinal tenderness, not a thumb pressed on your back. A clinic that schedules three facet injections before interpreting the first one is not diagnosing anything. It is treating a hypothesis.

The numbers behind that caution are not flattering, and they belong on a consent form. In a study of chronic low back pain evaluated with controlled comparative lumbar medial branch blocks under fluoroscopy, about 34 percent of patients proved to have facet-mediated pain — and a single block, one injection followed by one report of relief, was falsely positive close to half the time (Manchikanti 2020).¹ Roughly a coin flip. These figures come from lumbar patients; cervical facet pain is real and the same diagnostic logic applies, but low back numbers should not be stretched onto a neck.

It also matters that the two common procedures are not the same thing, even though patients are often told they are:

• An intra-articular facet injection passes the needle through the joint capsule into the joint space — a space that holds barely one to two milliliters before it distends — and deposits steroid inside the joint. That is aimed at treating a joint.
• A medial branch block stops on bone next to the nerve and anesthetizes it. That is aimed at asking a question.

Different target, different needle path, different purpose. The 2020 multispecialty consensus guidelines on lumbar facet joint pain, from Cohen and colleagues, concluded that medial branch blocks are more predictive than intra-articular injection for selecting patients.² That is a consensus position from a guideline working group rather than a head-to-head trial result, and it is lumbar-specific. A block also tests the exact nerve that radiofrequency treatment would later target, which an intra-articular injection does not.

And on the treatment side, the evidence for steroid inside the joint is weaker than the marketing. In a randomized, double-blind trial of steroid injected into the lumbar facet joints, patients whose facet pain had already been confirmed by dual comparative blocks received either intra-articular triamcinolone or saline. The steroid did not reduce or delay the need for radiofrequency neurotomy.³ That trial enrolled 28 subjects and its endpoint was progression to a procedure rather than a pain score, so it does not prove steroid is useless — but nobody can honestly promise months of relief from steroid inside a facet joint on the strength of the published evidence. One more caveat: no corticosteroid carries an FDA-approved indication for spinal facet or medial branch injection. That use is off-label.

What a real diagnostic block looks like

If no scan can convict the joint, you interrogate its nerves — one at a time, under conditions strict enough that the answer means something. The full procedural detail, including how the injection itself is performed, is on our facet joint injection treatment page. The diagnostic standard behind it is this:

• Controlled comparative blocks, not one block. A short-acting anesthetic on the first day, a longer-acting anesthetic on a separate day. 80 percent relief or better on both, with the duration of relief matching each drug’s pharmacology.
• Local anesthetic only — no steroid in a diagnostic block. Days later you could not separate an anesthetic response from an anti-inflammatory one, and the answer is the point.
• A fraction of a milliliter per nerve. More volume spreads to structures nobody is testing and manufactures a false positive.
• Live imaging with contrast first, to confirm placement and exclude intravascular uptake, which produces a false negative.
• A pain diary, and instructions to provoke the movement that hurts inside the anesthetic window. Your honesty during those hours is the instrument.

Understand what this test is not. In that same lumbar study, relief at the 80 percent level averaged about six days with lidocaine and thirteen days with bupivacaine; partial relief of 50 percent or better ran longer — roughly 32 and 55 days.¹ Weeks, not years, and then it is gone. A medial branch block is a question, not a treatment. Sold as therapy, it is a lab test billed as care.

Risks, stated plainly

Soreness or a pain flare for one to three days, bruising, and vasovagal fainting are the common, temporary events. Anesthetic can spread and cause temporary numbness or weakness in a limb — do not drive until it resolves. Uncommonly: infection including septic arthritis; bleeding, including epidural hematoma, a risk that rises sharply on blood thinners, so disclose every anticoagulant and antiplatelet before scheduling; dural puncture with spinal headache; intravascular injection; allergic reaction; nerve injury. If a corticosteroid is used — and in a purely diagnostic block it is not — expect several days of elevated blood glucose, which matters if you are diabetic, plus flushing, insomnia, fluid retention, and temporary adrenal suppression; repeated steroid exposure can affect bone density. In the neck, a third occipital nerve block can leave temporary unsteadiness and scalp numbness, so arrange a ride home; those nerves sit near the vertebral artery, and injection into that vessel, or rarely spinal cord injury, are recognized risks there. Fluoroscopy uses ionizing radiation — tell us if you may be pregnant.

What the result means for your evaluation

Candidates for this evaluation have axial low back or neck pain lasting beyond three months, worse with extension and rotation, without radicular pain, weakness, numbness, or neurologic deficit, after conservative care has failed. New weakness, bowel or bladder change, fever, unexplained weight loss, active infection, or uncontrolled bleeding risk means urgent evaluation — not an injection.

The differential is crowded, and imaging does not sort it: discogenic pain, sacroiliac joint pain, hip osteoarthritis referring into the buttock and groin, spinal stenosis, myofascial pain. Pattern, examination, and selective blocks sort it.

Two outcomes follow, and both are useful:

Two matching positive blocks buy candidacy for radiofrequency neurotomy of those same nerves — the step covered on our facet joint radiofrequency ablation page. The lumbar guideline from Cohen and colleagues states that lumbar medial branch radiofrequency may benefit well-selected individuals — and deliberately attaches no duration to that benefit.² Observational series suggest something in the range of six to twelve months, which is lower-certainty evidence than a controlled trial and should be read that way. Nerves regenerate and pain can return. That is biology, not failure.

A negative second block is equally a success. It means the facet joints are not the generator, ablation is off the table, and the search moves to the structure that is actually responsible. Treating the wrong structure is the failure; declining to treat it is not.

The following is a composite — a picture assembled from many patients with this condition, not one person’s chart, and not a trial result. Three years of band-like low back pain, worst standing at a counter and arching to a shelf, never below the knee. Two intra-articular injections elsewhere, neither explained. A first medial branch block with lidocaine gave 90 percent relief that held about a week, then faded — which felt like failure and was in fact an answer. A second block on a separate day with a longer-acting agent reproduced the same 90 percent and held roughly twice as long, exactly as that drug should. That earns radiofrequency. In the alternate version of the same story, the second block was negative, no ablation was performed, and the real generator was found elsewhere. Individual results vary.

A note on adjuncts: nutrition, specialized pro-resolving mediators, and red-light therapy are adjunctive or emerging in this setting, not established care for facet-mediated pain, and none of the studies cited here evaluated them.

Frequently asked questions

Key takeaways

• Facet joints are true synovial joints supplied by two medial branch nerves per level (with the L5 dorsal ramus as the exception at L5-S1), which is why they hurt with extension and rotation and produce a band of axial pain rather than leg pain.
• No scan and no exam maneuver can prove a facet joint is your pain generator; imaging findings reflect age, and only about 34 percent of chronic low back pain proves facet-mediated under controlled comparative blocks.
• A single positive block is falsely positive roughly half the time, so two controlled comparative blocks at an 80 percent relief threshold — anesthetic only, no steroid — are the standard before anyone proceeds.
• Steroid inside the lumbar facet joint has not been shown to reduce or delay the need for radiofrequency neurotomy in a small randomized trial, and no corticosteroid is FDA-approved for this use.
• Lumbar medial branch radiofrequency after two positive blocks may benefit well-selected individuals, but the guideline attaches no duration to that benefit and everything beyond it is observational.
• If your pain is worse when you arch and twist, insist on the diagnosis before you accept the procedure.

Medically reviewed by Gurpreet Singh Padda, MD — Board Certified in Anesthesiology, Pain Medicine, Interventional Pain Management, Addiction Medicine, and Obesity Medicine. Last reviewed July 2026.

This article is educational and is not a substitute for evaluation, diagnosis, or treatment by a physician. Individual results vary. Do not start, stop, or change any medication without consulting your physician. To be evaluated at Padda Institute Center for Interventional Pain Management, call (314) 481-5000 or text (314) 886-5902.

References

1. Cohen SP, et al. Consensus practice guidelines on interventions for lumbar facet joint pain from a multispecialty, international working group. Reg Anesth Pain Med. 2020;45(6):424-467. PMID 32245841. PubMed
2. Manchikanti L, et al. Low Back Pain and Diagnostic Lumbar Facet Joint Nerve Blocks: Assessment of Prevalence, False-Positive Rates, and a Philosophical Paradigm Shift from an Acute to a Chronic Pain Model. Pain Physician. 2020;23(5):519-530. PMID 32967394. PubMed
3. Kennedy DJ, et al. Corticosteroid Injections Into Lumbar Facet Joints: A Prospective, Randomized, Double-Blind Placebo-Controlled Trial. Am J Phys Med Rehabil. 2018;97(10):741-746. PMID 29734232. PubMed

Dr. Gurpreet Singh Padda, MD, MBA, MHP