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

What this video covers

• Why facet (zygapophyseal) joints hurt: a stretched capsule, an inflamed lining (synovitis), cartilage loss, and the medial branch nerves.
• Intra-articular facet injection versus medial branch block, and why a diagnostic block should hold numbing medicine only.
• Why imaging cannot make this diagnosis, and why one positive block is wrong half the time.
• What the randomized evidence shows about steroid inside the joint, and why no cited trial sets a duration.
• The named risks, and why a block is a test, not 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.

Back pain that worsens when you arch and twist points to the facet joints. It sits in a band across the low back and does not run down the leg. Yet no MRI or exam maneuver proves they are the source. A medial branch block with local anesthetic only, numbing both nerves to the joint, is the test that answers it.

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. It is worse straightening out of a chair. It is worse walking downhill, where your spine stays arched the whole way.

Then a radiology report came back reading multilevel facet arthropathy, degenerative changes — and maybe you got an injection on the strength of that phrase. No one explained 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 and why they cause exactly that band of pain. It explains why no scan and no exam maneuver can confirm they are the source. And it shows what a real diagnostic test looks like.

What are facet joints, and why do they hurt?

The zygapophyseal joints — the facets — are the paired joints at the back of the spine, one on each side. They link each vertebra to the one above and below. They are true synovial joints. Each has cartilage on paired surfaces, a lining called the synovium, a fluid-filled space, and a tough capsule packed with nerves.

That build is why they can hurt. Cartilage thins. The capsule stiffens. The synovium (the joint lining) becomes inflamed. The joint then hurts under load — and the load that matters here is not bending forward or lifting. It is extension and rotation: arching presses those joint surfaces together, and rotation shears them.

Now the anatomy that drives everything that follows. Each lumbar facet joint is supplied by two nerves — medial branches of the dorsal rami. One comes from the level above and one from the joint’s own level. They cross a steady landmark: the spot where the superior articular process meets the transverse process. There they run under the mamillo-accessory ligament.

There is one key 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. It sits where the sacral ala meets the S1 superior articular process, paired with the L4 medial branch above. Two targets still, one of them named differently 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.

What does facet joint pain feel like?

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

• Worse arching to a high shelf. Arching closes the back joint surfaces. The capsule and the inflamed lining take the load directly.
• Worse standing still at a counter. Standing holds the low back slightly arched the whole time, so the load never comes off.
• Worse straightening up out of a chair. That movement takes the spine from bent forward to arched, under body weight.
• Worse walking downhill. Going downhill keeps the low back arched for the whole descent.
• A band across the low back, not down the leg. The facet joints and their capsules sit in the center of the spine. When they are the pain generator, the pain stays central. Pain that runs below the knee with numbness or weakness points to a different structure — and that is a different workup.

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

Can an MRI diagnose facet joint pain?

Here is the part that is rarely read back to patients with care. A report that describes facet arthrosis or degenerative changes is describing what your joints look like at your age — not that those joints are making your pain. Age-related facet arthrosis shows up on a large share of scans. It matches poorly with who actually hurts.

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

The numbers behind that caution are not flattering, and they belong on a consent form. One study looked at chronic low back pain tested with controlled comparative lumbar medial branch blocks under fluoroscopy (live X-ray). In it, 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 About a coin flip. These figures come from lumbar patients. Neck facet pain is real and the same 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. That space holds barely one to two milliliters before it stretches. The needle leaves steroid inside the joint. That is aimed at treating a joint.
• A medial branch block stops on bone next to the nerve and numbs 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 picking patients.² That is a consensus position from a guideline working group, not a head-to-head trial result. And it is lumbar-specific. A block also tests the exact nerve that radiofrequency treatment would later target. An intra-articular injection does not.

On the treatment side, the evidence for steroid inside the joint is weaker than the marketing. Take a randomized, double-blind trial of steroid injected into the lumbar facet joints. Every patient’s facet pain had already been confirmed by dual comparative blocks. They got either triamcinolone or saline inside the joint. The steroid did not reduce or delay the need for radiofrequency neurotomy.³ That trial enrolled 28 subjects. Its endpoint was moving on to a procedure, not a pain score. So it does not prove steroid is useless — but no one can honestly promise months of relief from steroid inside a facet joint based on the published evidence.

How is facet joint pain diagnosed?

If no scan can convict the joint, you question its nerves — one at a time, under rules strict enough that the answer means something. The full procedure, including how the injection itself is done, 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 length of relief matching how long each drug should last.
• Local anesthetic only — no steroid in a diagnostic block. Days later you could not tell a numbing response from an anti-inflammatory one, and the answer is the point.
• A fraction of a milliliter per nerve. More volume spreads to structures no one is testing and creates a false positive.
• Live imaging with contrast first, to confirm placement and rule out uptake into a blood vessel, which creates a false negative.
• A pain diary, and instructions to provoke the movement that hurts inside the numbing 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 — about 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, short-lived events. Anesthetic can spread and cause brief numbness or weakness in a limb — do not drive until it wears off. Less common: infection, including septic arthritis. Bleeding, including epidural hematoma, a risk that rises sharply on blood thinners, so tell us every anticoagulant and antiplatelet before scheduling. Dural puncture with spinal headache. Injection into a blood vessel. Allergic reaction. Nerve injury. If a corticosteroid is used — and in a purely diagnostic block it is not — expect several days of high blood sugar, which matters if you are diabetic. Also expect flushing, poor sleep, fluid retention, and short-term adrenal suppression. Repeated steroid exposure can affect bone density. In the neck, a third occipital nerve block can leave brief unsteadiness and scalp numbness, which passes quickly; most patients drive themselves home once it does. Those nerves sit near the vertebral artery. Injection into that vessel, or rarely spinal cord injury, are known 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. It should be 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 list of suspects is crowded, and imaging does not sort it: discogenic pain, sacroiliac joint pain, hip osteoarthritis sending pain into the buttock and groin, spinal stenosis, myofascial pain. Pattern, exam, and selective blocks sort it.

Two outcomes follow, and both are useful:

Two matching positive blocks earn 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 people — and on purpose attaches no duration to that benefit.² Observational series suggest about six to twelve months. That is weaker evidence than a controlled trial and should be read that way. Nerves grow back and pain can return. That is biology, not failure.

A negative second block is just as much 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 truly 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. That felt like failure and was in fact an answer. A second block on a separate day with a longer-acting drug gave the same 90 percent. It held about twice as long, exactly as that drug should. That earns radiofrequency. In the other version of the same story, the second block was negative. No ablation was done, and the real generator was found elsewhere. Individual results vary.

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

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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). That is why they hurt with arching and twisting and cause a band of central back pain, not leg pain.
• No scan and no exam maneuver can prove a facet joint is your pain generator. Imaging findings reflect age. Only about 34 percent of chronic low back pain proves facet-mediated under controlled comparative blocks.
• One positive block is falsely positive about half the time. So two controlled comparative blocks at an 80 percent relief bar — anesthetic only, no steroid — are the standard before anyone moves ahead.
• In a small randomized trial, steroid inside the lumbar facet joint did not reduce or delay the need for radiofrequency neurotomy. No corticosteroid is FDA-approved for this use.
• Lumbar medial branch radiofrequency after two positive blocks may benefit well-selected people. 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.

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

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

Dr. Gurpreet Singh Padda, MD, MBA, MHP