Deep Low Back Pain With a Normal MRI: Understanding Internal Disc Disruption

What this video covers

• How the outer annulus becomes a pain generator, and what tissue studies show about nerve fibers extending into the inner disc in chronic back pain
• Why internal disc disruption can cause severe axial pain with a nearly normal-looking MRI
• How manometric provocative discography actually works: fluoroscopic needle placement, controlled pressurization, and concordant pain reproduction
• Why the negative control disc is the single most important part of the test, and how post-procedure CT grades annular fissures
• What the evidence shows about specificity, false-positive rates, and which patient groups have unacceptably high false-positive rates
• The two risks that matter: infectious discitis, and what the ten-year and seven-year cohort studies show about disc puncture and why they disagree
• 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 sit down, and within ten minutes it starts. Deep, central, low back pain — not down the leg, not around the side, but dead center behind the belt line, a pressure that builds the longer you stay loaded. Bending forward to pick something off the floor is the worst thing you do all day. Lying flat gives you relief within minutes, which is exactly why nobody at work believes you. You have carried this for a year, maybe three. And your imaging says almost nothing: degenerative changes at a couple of levels, no stenosis, no nerve root compression — nothing that explains why you cannot sit through a meal.

This article explains what may actually be happening inside the disc, why it produces exactly the symptom you feel, why the MRI so often fails to settle the question, and what an honest diagnostic pathway looks like — including the evidence that does not flatter the tests involved.

What a lumbar disc is, and why it is not supposed to hurt

A lumbar disc is a pressurized gel core, the nucleus pulposus, restrained by concentric rings of obliquely oriented collagen called the annulus fibrosus, anchored above and below to the vertebral endplates. It is a load-bearing structure, built to be pressurized and unloaded again every time you sit, stand, and bend.

The reason it can normally do that without complaint is that most of it has no sensory supply. In a healthy back, only the outer third of the annulus carries nerve fibers. The inner annulus and the nucleus are, by design, silent tissue.

That design can fail. In 1997, Freemont and colleagues published tissue work in The Lancet examining discs from patients with chronic back pain. In the control samples, nerves stayed where they belonged — outer or middle third of the annulus only. In the chronic-pain specimens, nerve fibers had extended into the inner third of the annulus in 46 percent of samples, and into the nucleus pulposus itself in 22 percent. Those fibers expressed substance P, a neuropeptide associated with pain signaling.[1]

Read that again, because it is the whole point: tissue that is supposed to have no sensory supply has been shown to grow one. That is tissue-level evidence for a mechanism. It is not proof that any individual disc is the source of any individual patient’s pain, and it should not be read that way.

The clinical entity built on this is internal disc disruption — a radial fissure propagating from the degenerated core outward through the collagen layers into newly innervated territory, so that ordinary loading is transduced as pain.

Why this produces deep, central pain that gets worse the longer you sit

Once nerve fibers sit inside tissue that gets compressed every time you load your spine, the pain follows mechanics rather than anatomy of a nerve root.

That is why the pain is axial — deep and central, behind the belt line — instead of shooting down a leg in a stripe. Nothing is pressing on a nerve root, so nothing follows a dermatome. The pain generator is the disc itself.

It is also why sitting is worse than standing, and why bending forward to lift something off the floor is the single worst movement of your day: both load the disc. And it is why lying flat brings relief within minutes — unload the disc, and the fissured, innervated tissue stops being provoked.

That symptom pattern is the reason patients with this problem are so often disbelieved. It is invisible. You look fine standing at the counter. You are wrecked by minute ten of a meeting.

What the imaging can and cannot settle

Here is the reasoning error, stated plainly: a lumbar disc that looks degenerated on MRI is not evidence that the disc hurts.

Dark discs, height loss, and annular fissures are found constantly in people who have never had a day of back pain. Appearance is a population finding; pain is an individual one. When a fusion level is chosen from the ugliest disc on the film, that is an educated guess wearing the costume of a diagnosis.

This is why the same scan can send two patients through opposite doors. Behind the first, you are told the scan is unremarkable, your pain is deconditioning or stress, and you are handed a muscle relaxant. Behind the second, someone reads that same scan and offers a two-level fusion. Same images, opposite conclusions. Neither is a diagnosis.

None of this is a criticism of the physicians involved, or of conservative care, which has a legitimate place. Muscle relaxants, anti-inflammatories, and physical therapy are aimed at symptoms and at deconditioning. What they do not do is tell you which structure is generating the pain. And that question becomes decisive the moment surgery enters the conversation.

Working through the differential before the disc is ever questioned

Deep axial low back pain has a real differential, and it should be worked through in order before anyone considers testing a disc:

• Facet-mediated pain, tested with dual comparative medial branch blocks — with blocks, not with a picture.
• Sacroiliac joint pain, with its own provocation maneuvers and diagnostic block.
• Radicular pain, which follows a dermatome and declares itself on examination.
• Hip pathology masquerading as back pain.
• Myofascial and gluteal sources.

Only when those are genuinely excluded, and pain has persisted beyond six months despite honest conservative care, does the disc come into question.

There is one more filter, and it is applied without apology. Untreated psychological distress and somatization change what a provocative test means. In the systematic review by Wolfer and colleagues in Pain Physician in 2008 — a review of provocation discography performed in asymptomatic subjects — patients with somatization disorder showed a false-positive rate near 50 percent. Prior discectomy: 15 percent. A painful iliac crest donor site: 12.5 percent — all measured per patient.[2] Screening is not a judgment about you. It is arithmetic.

How the disc is questioned directly

Provocative discography — often called a discogram — asks a different kind of question than imaging does. It does not look at the disc. It interrogates the disc directly, and it is allowed to come back negative.

Under fluoroscopy, with the patient positioned prone and obliqued, skin prepared with strict sterile technique and antibiotic prophylaxis given, an introducer needle is placed extrapedicular — lateral to the superior articular process and anterior to the exiting nerve root — and a fine inner needle advances into the center of the nucleus. Contrast is then injected slowly through a manometer while pressure, not volume, is watched. The entire interpretation depends on pressure.

A positive level requires two things at once:

1. Concordant pain. The injection reproduces your usual, familiar pain — not mere pressure, not “some” discomfort, but the pain you came in with.
2. At low pressure. It does so near opening pressure, rather than by brute-forcing a normal disc until anything would hurt.

And the element that makes the test legitimate is the control disc. At least one adjacent disc must be pressurized and not reproduce your pain. Without a negative control, a positive result is uninterpretable. Afterward, CT grades how far the fissure has propagated through the annular layers, and that grading, together with the pressure data, goes into the report.

How the procedure itself is scheduled, performed, and recovered from is covered on the discogram and provocative discography procedure page.

Two points on safety belong here rather than in fine print. The most serious recognized complication is discitis — infection of the disc space — which is why sterile technique and antibiotic prophylaxis are non-negotiable. New back pain with fever in the days after the procedure is an emergency; call the office immediately. Increased soreness for several days afterward can also occur.

A test that is not permitted to say no is not a test. If a physician is not willing to tell you that your discs are not the source, and that surgery is off the table, they have no business putting a needle into them.

The honest evidence, including the parts that do not flatter the procedure

Wolfer’s meta-analysis pooled eleven studies of discography in asymptomatic subjects and found a specificity of 0.94 (95% CI 0.88–0.98) when strict standards are applied. Overall false positives ran about 9 percent per patient and 6 percent per disc. Because there is no independent gold standard for discogenic pain, sensitivity is unknown, and the evidence sits at Level II-2.[2] This is a good test, not a perfect one.

The second issue is the disc itself. In 2009, Carragee and colleagues published a ten-year matched cohort study in Spine — the ISSLS prize winner. Degenerative progression occurred in 35 percent of punctured discs versus 14 percent of controls, with significantly more new herniations, falling disproportionately on the side of the annular puncture. That study used small-gauge needles and limited pressurization; by its own conclusion, gentle modern technique did not prevent the effect.[3]

In 2019, McCormick and colleagues published a seven-year matched cohort, also in Spine, using low-pressure Spine Intervention Society standards, and found no acceleration of disc degeneration.[4] That null result deserves to be taken seriously — and read accurately. It was retrospective, in symptomatic patients who did not go on to fusion, and graded Level 3 evidence. It lowers the concern. It does not settle it. This is a genuinely contested area, and you are entitled to hear it presented that way.

What this means for how you should be evaluated

Because of everything above, discography is reserved for patients actively contemplating surgery, where knowing the responsible level would change what is done. Whether identifying that level improves surgical outcomes remains debated. A positive discogram is one input. It is not a green light.

To make the pathway concrete: what follows is a composite — a picture assembled from many patients with this condition, not one person’s chart. Three years of central low back pain, worse sitting, better lying flat. Physical therapy, medication, time. Facet sources evaluated with comparative medial branch blocks: negative. Sacroiliac joint excluded. An MRI showing changes at three levels and answering nothing. A two-level fusion had already been proposed. Screening came first, including a candid conversation about mood, sleep, and distress. At discography, one level reproduced the exact familiar pain at low pressure; the level above it, fully pressurized, produced nothing; a second control disc was also silent. CT showed a fissure reaching the outer annulus at that single level only. What was hard: the waiting, and several days of increased soreness afterward. What changed: a two-level operation became a one-level conversation, informed rather than inferred. Recovery took months, not days.

This is a practice observation, not a trial result. Individual results vary. And the honest possibility, discussed beforehand, is that every level comes back negative and surgery is not indicated at all. That happens. It is a legitimate result, not a failure.

Nutritional and metabolic support may run alongside as an adjunct. In discogenic pain specifically, that evidence is emerging, not established — it is investigational, and it substitutes for nothing.

If you have deep axial low back pain past six months, a scan that explains nothing, and someone is discussing fusion, you are entitled to know which structure is generating the pain first. Ask the disc. Then decide.

Frequently asked questions

Key takeaways

• A disc can become a pain generator when nerve fibers grow into tissue that is normally silent — documented in tissue studies of chronic back pain — producing deep central pain with no nerve root compression and a near-normal MRI.
• Because degenerated-looking discs are common in painless people, imaging cannot identify which disc hurts; a test that directly provokes the disc, with a negative control disc, is the main way that question is addressed.
• The evidence is honest but limited: pooled specificity 0.94 (95% CI 0.88–0.98), false positives about 9 percent per patient and 6 percent per disc, sensitivity unknown, Level II-2 — and whether disc puncture accelerates degeneration remains contested between a ten-year and a seven-year cohort study.
• Discography is not a first move. Facet, sacroiliac, radicular, hip, and myofascial sources should be worked through first, pain should have persisted beyond six months, and psychological screening is part of selection.
• If a fusion is being discussed based on a scan that explains nothing, ask which structure is generating the pain before you accept the operation. Individual results vary.

Medically reviewed by Gurpreet Singh Padda, MD, MBA, MHP — 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 the Padda Institute Center for Interventional Pain Management, call (314) 481-5000 or text (314) 886-5902.

References

1. Freemont AJ, Peacock TE, Goupille P, Hoyland JA, O’Brien J, Jayson MI. Nerve ingrowth into diseased intervertebral disc in chronic back pain. Lancet. 1997 Jul 19;350(9072):178-81. PMID 92501861010160140673697021351. PubMed
2. Wolfer LR, Derby R, Lee JE, Lee SH. Systematic review of lumbar provocation discography in asymptomatic subjects with a meta-analysis of false-positive rates. Pain Physician. 2008 Jul-Aug;11(4):513-38. PMID 18690280. PubMed
3. Carragee EJ, Don AS, Hurwitz EL, Cuellar JM, Carrino JA, Herzog R. 2009 ISSLS Prize Winner: Does discography cause accelerated progression of degeneration changes in the lumbar disc: a ten-year matched cohort study. Spine (Phila Pa 1976). 2009 Oct 1;34(21):2338-45. PMID 19755936101097001331815432. PubMed
4. McCormick ZL, Lehman VT, Plastaras CT, Walega DR, Huddleston P 3rd, Moussallem C, Geske JR, Verdoorn JT, Kennedy DJ, Maus TP, Carr CM. Low-Pressure Lumbar Provocation Discography According to Spine Intervention Society/International Association for the Study of Pain Standards Does Not Cause Acceleration of Disc Degeneration in Patients With Symptomatic Low Back Pain: A 7-Year Matched Cohort Study. Spine (Phila Pa 1976). 2019 Oct 1;44(19):E1161-E1168. PMID 312612831010970000000000003085. PubMed

Dr. Gurpreet Singh Padda, MD, MBA, MHP