What this video covers
- How the outer ring of the disc becomes a pain source, and what tissue studies show about nerve fibers growing into the inner disc in chronic back pain
- Why internal disc disruption can cause severe central back pain with a nearly normal MRI
- How pressure-controlled discography really works: X-ray-guided needle placement, slow pressurizing, and reproducing your usual pain
- Why the negative control disc is the most important part of the test, and how a CT scan afterward grades cracks in the disc wall
- What the evidence shows about specificity (how well the test avoids blaming the wrong disc), false positives, and which patient groups have far too many false positives
- The two risks that matter: disc infection (discitis), and what the ten-year and seven-year 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.
Deep, central low back pain with a nearly normal MRI can come from internal disc disruption. A crack runs from the worn core into an outer ring that has grown nerve fibers. So normal sitting and bending register as pain. Nothing presses on a nerve root. That is why the scan shows almost nothing.
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. The pressure builds the longer you stay loaded. Bending forward to pick something off the floor is the worst thing you do all day. Lying flat brings relief within minutes. That is exactly why nobody at work believes you. You have carried this for a year, maybe three. And your scans say almost nothing: wear at a couple of levels, no narrowing, no pinched nerve root — nothing that explains why you cannot sit through a meal.
This article explains what may really be happening inside the disc. It explains why it causes exactly what you feel, and why the MRI so often fails to settle the question. And it shows what an honest path to diagnosis looks like — including the evidence that does not flatter the tests.
What is internal disc disruption?
A lumbar disc is a pressurized gel core, the nucleus pulposus. Rings of angled collagen called the annulus fibrosus hold it in. The disc is anchored above and below to the vertebral endplates. It carries load. It is built to be pressurized and unloaded every time you sit, stand, and bend.
It can normally do that without complaint because most of it has no nerve supply. In a healthy back, only the outer third of the annulus has nerve fibers. The inner annulus and the nucleus are silent tissue by design.
That design can fail. In 1997, Freemont and colleagues published tissue work in The Lancet. They studied discs from patients with chronic back pain. In the control samples, nerves stayed where they belonged — the outer or middle third of the annulus only. In the chronic-pain samples, nerve fibers had grown into the inner third of the annulus in 46 percent of samples. They reached the nucleus pulposus itself in 22 percent. Those fibers carried substance P, a chemical tied to pain signaling.[1]
Read that again, because it is the whole point. Tissue that should have no nerve supply has been shown to grow one. That is tissue-level evidence for how the pain can happen. It is not proof that any one disc is the source of any one patient’s pain. It should not be read that way.
The condition built on this is internal disc disruption. A crack spreads from the worn core outward through the collagen layers into tissue that now has nerves. So normal loading turns into pain.
What are the symptoms of internal disc disruption?
Once nerve fibers sit inside tissue that gets squeezed every time you load your spine, the pain follows mechanics, not the path of a nerve root.
That is why the pain is axial — deep and central, behind the belt line. It does not shoot down a leg in a stripe. Nothing is pressing on a nerve root, so nothing follows a dermatome (the strip of skin one nerve serves). The disc itself is the pain source.
It is also why sitting is worse than standing. It is why bending forward to lift something off the floor is the worst move of your day. Both load the disc. And it is why lying flat brings relief within minutes. Unload the disc, and the cracked tissue with its new nerves stops being provoked.
That pattern is why patients with this problem are so often not believed. It is invisible. You look fine standing at the counter. You are wrecked by minute ten of a meeting.
Does internal disc disruption show up on an MRI?
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 cracks in the disc wall show up all the time in people who have never had a day of back pain. How a disc looks is a population finding. Pain is a personal one. When a fusion level is picked from the ugliest disc on the film, that is an educated guess wearing the costume of a diagnosis.
That is why the same scan can send two patients through opposite doors. Behind the first, you are told the scan is normal and your pain is from being out of shape or stress. You get a muscle relaxant. Behind the second, someone reads the same scan and offers a two-level fusion. Same images, opposite conclusions. Neither is a diagnosis.
None of this attacks the doctors involved, or conservative care, which has a real place. Muscle relaxants, anti-inflammatories, and physical therapy treat symptoms and poor conditioning. What they do not do is tell you which structure is making the pain. And that question becomes decisive the moment surgery comes up.
Working through the differential before the disc is ever questioned
Deep central low back pain has a real list of possible causes. Work through it in order before anyone thinks about testing a disc:
- Facet-mediated pain, tested with two comparison medial branch blocks — with blocks, not with a picture.
- Sacroiliac joint pain, with its own exam tests and diagnostic block.
- Radicular pain, which follows a dermatome and shows itself on exam.
- Hip pathology masquerading as back pain.
- Myofascial and gluteal sources.
Only when those are truly ruled out, and pain has lasted past six months despite honest conservative care, does the disc come into question.
There is one more filter, and we apply it without apology. Untreated emotional distress and somatization (stress that shows up as body symptoms) change what a provocation test means. Wolfer and colleagues did a systematic review in Pain Physician in 2008. It looked at provocation discography in people with no back pain. Patients with somatization disorder had 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 is internal disc disruption diagnosed?
Provocative discography — often called a discogram — asks a different question than a scan does. It does not look at the disc. It questions the disc directly. And it is allowed to come back negative.
The patient lies face down, turned slightly to one side, under X-ray guidance. The skin is cleaned with strict sterile technique, and antibiotics are given to prevent infection. An introducer needle is placed beside the pedicle — to the side of the superior articular process and in front of the exiting nerve root. A fine inner needle then moves into the center of the nucleus. Dye is injected slowly through a pressure gauge. The doctor watches pressure, not volume. The whole reading depends on pressure.
A positive level needs two things at once:
- Concordant pain. The injection brings back your usual, familiar pain — not just pressure, not “some” discomfort, but the pain you came in with.
- At low pressure. It does so near opening pressure, not by forcing a normal disc until anything would hurt.
What makes the test valid is the control disc. At least one nearby disc must be pressurized and not bring back your pain. Without a negative control, a positive result means nothing. Afterward, a CT scan grades how far the crack has spread through the disc wall. That grade, along with the pressure data, goes into the report.
How the procedure is scheduled, done, and recovered from is covered on the discogram and provocative discography procedure page.
Two safety points belong here, not in fine print. The most serious known complication is discitis — infection of the disc space. That is why sterile technique and preventive antibiotics are a must. New back pain with fever in the days after the procedure is an emergency. Call the office right away. More soreness for several days afterward can also happen.
A test that is not allowed to say no is not a test. If a doctor will not tell you that your discs are not the source, and that surgery is off the table, they have no business putting a needle in them.
The honest evidence, including the parts that do not flatter the procedure
Wolfer’s meta-analysis pooled eleven studies of discography in people with no back pain. It found a specificity of 0.94 (95% CI 0.88–0.98) when strict standards are used. Overall false positives ran about 9 percent per patient and 6 percent per disc. There is no independent gold standard for disc pain. So 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 study in Spine — the ISSLS prize winner. Wear got worse in 35 percent of punctured discs versus 14 percent of controls. There were significantly more new herniations, and an outsized share were on the side of the puncture. That study used small needles and limited pressure. By its own conclusion, gentle modern technique did not prevent the effect.[3]
In 2019, McCormick and colleagues published a seven-year matched study, also in Spine. It used low-pressure Spine Intervention Society standards and found no acceleration of disc wear.[4] That result deserves to be taken seriously — and read accurately. It looked backward, at patients with pain who did not go on to fusion. It was graded Level 3 evidence. It lowers the concern. It does not settle it. This is a truly contested area, and you have a right to hear it that way.
What this means for how you should be evaluated
Because of all this, discography is saved for patients actively weighing surgery, where knowing the painful level would change what is done. Whether finding that level improves surgery results is still debated. A positive discogram is one input. It is not a green light.
To make the path 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, medicine, time. Facet sources checked with comparison medial branch blocks: negative. Sacroiliac joint ruled out. An MRI showing changes at three levels and answering nothing. A two-level fusion had already been offered. Screening came first, including a frank talk about mood, sleep, and distress. At discography, one level brought back 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 crack reaching the outer ring at that single level only. What was hard: the waiting, and several days of extra soreness afterward. What changed: a two-level operation became a one-level conversation, based on evidence instead of guesswork. 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 needed at all. That happens. It is a real result, not a failure.
Nutrition and metabolic support may run alongside as an add-on. For disc pain specifically, that evidence is emerging, not established, and it replaces nothing.
Say you have deep central low back pain past six months, a scan that explains nothing, and someone is talking fusion. You have a right to know which structure is making the pain first. Ask the disc. Then decide.
Frequently asked questions
My MRI shows degenerated discs. Doesn’t that prove which one is causing my pain?
No. Disc wear, height loss, and cracks in the disc wall show up routinely in people with no back pain at all. So looks alone cannot find the pain source. Picking a surgery level from the worst-looking disc on a film is a guess, not a diagnosis. Provocative discography exists because the picture cannot answer that question — and, importantly, because the test is allowed to come back negative.
There is more on this in What Is a Discogram? Provocative Discography and What It Can Establish.
What does a positive discogram actually mean?
It means two things happened together at one level. The injection brought back your usual, familiar pain (concordant pain). And it did so at low pressure, near the disc’s opening pressure. Meanwhile, at least one nearby control disc was pressurized and did not hurt. Without that negative control disc, the result means nothing. Pooled specificity is 0.94 (95% CI 0.88–0.98) under strict standards. But sensitivity is unknown, because there is no independent gold standard. So a positive result is one input into a surgery decision, not a green light.
For what a discogram can and cannot settle, read Provocative Discography: What a Discogram Can and Cannot Settle.
Is a discogram risky? I have read that it can damage the disc.
That concern is real and truly contested. A ten-year matched study found worsening wear in 35 percent of punctured discs versus 14 percent of controls. There were more herniations on the puncture side, despite small needles and limited pressure. A later seven-year study using low-pressure standards found no acceleration. But it looked back at patients with pain who did not go on to fusion. So it lowers the concern but does not settle it. Separately, the most serious known complication is discitis — infection of the disc space. That is why sterile technique and preventive antibiotics are used. And it is why new back pain with fever afterward is an emergency.
Should I stop my pain medication before this kind of evaluation?
Not on your own. Some medicines are adjusted around a procedure and others are not. It depends on what you take, why, and what else is planned. Do not start, stop, or change any medication without consulting your physician — bring a full list of everything you take, including over-the-counter products and supplements, to your visit.
Why would a doctor ask about my mood, sleep, or stress before a back procedure?
Because it changes the accuracy of the test, not because your pain is being brushed off. In the pooled data, patients with somatization disorder had a false-positive rate near 50 percent. Prior discectomy was 15 percent. A painful iliac crest donor site was 12.5 percent. All are per patient. Screening protects you from a false positive that could lead to an operation you do not need.
Where is the Padda Institute located, and how do I get an evaluation?
The main office is at 4477 Woodson Rd, Suite 100, St. Louis, MO 63134, right next to St. Louis Lambert International Airport. A second location is at 12174 Natural Bridge Rd, St. Louis, MO 63044. We serve the St. Louis region, Missouri and Illinois. Call (314) 481-5000 or text (314) 886-5902, Monday through Friday, 8:00 AM to 5:00 PM. Bring your imaging discs and reports, not just the written summaries.
Is internal disc disruption the same as a herniated disc?
No. Internal disc disruption is a crack. It runs from the worn center of the disc out through its collagen rings into tissue that has grown nerve fibers. Nothing presses on a nerve root. That is why the pain sits deep and central behind the belt line instead of shooting down a leg along one nerve’s path. And it is why the MRI can look almost normal.
Why does internal disc disruption hurt more when I sit?
Because sitting loads the disc. Once nerve fibers have grown into the inner disc, every squeeze of that tissue can register as pain. Sitting and bending forward to lift something both load the disc, so they hurt most. Lying flat unloads it. That is why relief often comes within minutes of lying down. The pain follows the mechanics of the disc, not the path of a nerve root.
What else can cause deep low back pain before the disc is blamed?
Several structures, checked in order before a disc is tested. The facet joints, using comparison medial branch blocks. The sacroiliac joint, with its own exam tests and block. Nerve root pain, which follows a strip of skin down the leg. The hip. And muscle sources in the back and buttock. Only when those are ruled out, and pain has lasted past six months despite honest conservative care, is the disc questioned.
Key takeaways
- A disc can become a pain source when nerve fibers grow into tissue that is normally silent. Tissue studies of chronic back pain show this. The result is deep central pain with no pinched nerve root and a near-normal MRI.
- Worn-looking discs are common in people with no pain. So scans cannot show which disc hurts. A test that directly provokes the disc, with a negative control disc, is the main way to answer that.
- 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. Whether disc puncture speeds up wear is still contested between a ten-year and a seven-year study.
- Discography is not a first move. Facet, sacroiliac, nerve root, hip, and muscle sources should be checked first. Pain should have lasted past six months. And mental health screening is part of choosing patients.
- If a fusion is being discussed based on a scan that explains nothing, ask which structure is making the pain before you accept the operation. Individual results vary.
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
- 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 9250186. PubMed
- 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
- 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 19755936. PubMed
- 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 31261283. PubMed
Get the diagnosis before you accept the procedure
Bring your imaging and your history to the Padda Institute Center for Interventional Pain Management in St. Louis. We will tell you which structure is actually generating your pain — and what the evidence does and does not support.
Or call or text us.
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
