A disc that hurts and a disc that looks bad are not the same disc

PRP FOR THE INTERVERTEBRAL DISC

Intradiscal PRP is used for axial discogenic pain only. That means pain in the back itself, coming from the disc. The disc must first be shown to be the pain source, not guessed from a scan. It does not rebuild the disc. The aim is to change the inflammatory setting inside it and calm the nerve fibers that grew in.

Intradiscal platelet-rich plasma is one of the more interesting things in this field. It is also one of the easiest to do badly. The difference is almost entirely in who gets picked for it.

Does an MRI show which disc is causing my pain?

Disc degeneration (breakdown) is close to universal with age. Bulges, drying out (desiccation), height loss and annular fissures (cracks in the outer ring) show up at high rates in people with no back pain at all. And they grow more common decade by decade.

So an MRI report that describes degenerative disc disease has told you what your spine looks like. It has not told you what hurts. Treating that report rather than the patient is how people end up with a string of procedures aimed at a finding that was never the problem.

What is discogenic pain?

A disc becomes a pain source through a fairly well-known sequence. The center (nucleus) loses proteoglycan and water. Load shifts in the wrong way to the outer ring (annulus). Cracks form. And — the part that matters — nerve fibers and blood vessels grow inward along those cracks. They grow into tissue that normally has no nerves (aneural).

That ingrowth is why one degenerated disc can hurt while a similarly degenerated disc in the next person does not. The pain needs nerves to have arrived. The inflammatory setting inside the disc keeps those nerves sensitized.

What is PRP trying to do inside a disc?

Not to rebuild the disc. Anyone showing you before-and-after MRIs as proof of disc regrowth is overselling something the imaging cannot show.

The plausible mechanism is about the setting. It changes the inflammatory mix inside the disc. It influences the cells that remain. And it reduces the sensitization of the nerve fibers that grew in. What people report is less pain in a disc that looks the same.

Does PRP for a disc actually work?

A prospective, double-blind, randomized controlled trial of lumbar intradiscal PRP found statistically significant improvement in pain and function against control. The gain held through follow-up. That is a real result. It is also one trial, in a small group, and it has not been repeated at scale.

So the position here is this. It is better supported than most people assume, and thinner than the marketing implies. Both are true and you should hear both. How to read a trial in this field.

What has to be established before a needle goes near a disc

This is the one place on the site where the bar to get in is stricter than the treatment. A disc is not a joint you can inject on a hunch and recheck in six weeks. The risk section below explains why. So four things are settled first, in order. If any of them fails, the answer is no.

The pain is axial. Back pain in the back itself, not pain running down a leg. Radicular pain (nerve pain) from a fragment pressing on a nerve is a nerve problem. It has a different anatomy and a different treatment. The disc is only where it started.

The disc is the generator. That means matching pain on provocation testing, or a diagnosis backed by a discogram where one has been done. Not an annular tear seen on a scan. Not degenerative change at the level a radiologist happened to mention. The point of the imaging section above is that the picture will not tell you this.

The segment still has something to work with. Disc height is preserved. There is no collapse, and no endplate change that says the structural horse has left. And there is no progressive weakness, numbness, or bowel and bladder change. That is surgical territory, urgently, and today rather than after a course of injections.

The non-procedural work has truly happened. A real course of loading and behavioral work, done properly. Not a handout given six months ago.

Meet all four and this is a reasonable thing to try. Miss one and what you need is a better diagnosis. That costs less and is worth more.

What are the risks of a PRP disc injection?

Discitis. Infection inside a disc is uncommon and serious. The disc has no blood supply (it is avascular). So antibiotics reach it poorly, and an infection that takes hold is hard to treat and slow to clear.

That one risk is why intradiscal work is done under strict sterile technique with preventive antibiotics (prophylaxis). It is why it is not offered casually. And it is why we talk people out of it, not into it, if the reason for it is soft. It is a different risk talk from injecting a tendon, and it should be.

Why the disc stopped tolerating what it used to tolerate

The adult disc is the largest structure in the body with no blood supply of its own. Food reaches it by diffusion (seeping) across the vertebral endplates. So the disc is unusually exposed to anything that harms small blood vessels or thickens what has to seep through. That is the mechanism. Here is the evidence for it.

Most risk-factor research is observational. It cannot separate cause from effect — painful backs make people sit still just as easily as sitting still makes backs painful. Mendelian randomization gets around that. It uses gene variants as stand-ins for lifelong exposure. A 2026 systematic review pooled 20 Mendelian randomization studies of intervertebral disc degeneration. It reported these as causal-leaning estimates:

• Time spent watching television — OR 1.78 (95% CI 1.52 to 2.08). This was the largest lifestyle effect you can change in the whole analysis, and not the one most people would guess.
• Body mass index — OR 1.26 (1.14 to 1.38), and waist circumference 1.26 (1.04 to 1.53).
• Smoking initiation — OR 1.22 (1.12 to 1.33).
• Triglycerides — OR 1.08 (1.03 to 1.13), and type 2 diabetes 1.05 (1.03 to 1.07).

Read the sitting figure again. Genetically predicted television time carried a larger effect on disc degeneration than diabetes, triglycerides and body mass index did. Movement loads, unloads and rehydrates a disc. A body that does not move is a disc that does not get its food cycled. That is a more useful instruction than most of what patients hear about their backs.

The blood supply argument, and its honest state

If diffusion is the disc’s only route to food, blood vessel disease upstream of it should matter. A systematic review of 27 studies looked at exactly that. Eight studies looked at atherosclerosis or lipid status against clinical back pain and sciatica. Of those, four found a positive association with abdominal aortic calcification or lumbar artery stenosis. Another 21 studies looked at atherosclerosis against disc degeneration or herniation. Of those, seven were positive. And eight trials found a positive association between lipid status and disc disease.

Four of eight, and seven of 21. We quote those denominators on purpose. The reviewers concluded the evidence supports poor blood supply adding to disc degeneration. It is a hypothesis with real support, not a settled fact — and that is exactly how we will describe it to you. In practice, it means a lipid panel and a blood-pressure reading are part of a back assessment here, not an unrelated errand. What we measure is on the metabolic health page.

The economics that put you in this chair

Look at the sequence the system actually funds. It will pay for the imaging that finds something in nearly everyone. It will pay for the injection and the fusion. It will not pay for the hour of behavioral work, the loading program, or anything that addresses the metabolic terrain the disc is failing in. And it calls the eighty-dollar preventive step unproven while covering the forty-thousand-dollar operation.

That is not anyone acting badly. It is an incentive structure, and incentive structures cause predictable damage without bad intentions. It lands hardest on pain refugees. They get passed between specialties and told the scan is unremarkable. They are left carrying the hint that this is somehow a failure of will.

It is not. It is physiology with an economic source upstream, and nobody explained it because no silo owns it.

What we ask before we go anywhere near a disc

Your glycemic status, because the disc is fed by diffusion, and that diffusion is the first thing insulin resistance degrades. Whether you smoke, for the same reason, more bluntly. What your day asks of your spine, in positions and hours rather than job title. And what has already been tried, with dates, because eight months of being told to rest is not the same as eight months of graded loading.

Say the terrain has never been addressed. Then treating the disc first asks a structure with no blood supply to rebuild with materials the body is not supplying right now. Why a pain clinic asks to see your bloodwork.

Where this sits against pain medication

Discogenic back pain is one of the most common routes onto long-term opioids. It is also one of the least satisfying to treat, because the pain is constant, the diagnosis is often uncertain, and each new procedure comes with a fresh promise attached.

Nobody here will require a taper as a condition of being assessed. What we do is confirm the disc before we treat it, because of the sequence that follows an unidentified one: a procedure, partial relief, a rising dose, then another procedure. That is the exact way people who came in with back pain leave with two problems. The strictness above is the stewardship position. It is not caution for its own sake.

What people ask before a disc is injected

Will this regrow my disc?

No. The plausible effect is on the setting inside the disc and the sensitized nerve fibers, not on disc height. What no available treatment does.

My MRI says degenerative disc disease. Do I need this?

Not on the imaging alone — those findings are common in people with no pain. Why we block before we inject.

Is it dangerous?

Discitis is the risk that matters. It is uncommon and serious, and it is the reason for strict technique and prophylaxis. Risks and side effects.

Is it covered by insurance?

No. This is a self-pay practice and does not bill insurance for it. That is a coverage decision by payers, not a statement about the treatment. Coverage and paying for it.

Who is a good candidate for intradiscal PRP?

Four things must be true first. The pain is axial, in the back itself rather than down a leg. The disc is the proven pain source, not just a finding on a scan. The segment still has preserved height, with no collapse or endplate change. And a real course of loading and behavioral work has already happened. If any one of these fails, the answer is no.

Can PRP help a disc that has collapsed?

No. Intradiscal PRP needs a segment that still has something to work with: preserved disc height, no collapse and no endplate change. PRP does not rebuild a disc or restore its height. Progressive weakness, numbness, or bowel and bladder change is a different matter. That is surgical territory, urgently, today rather than after a course of injections.

Does a PRP disc injection help sciatica?

Intradiscal PRP is for axial pain, meaning pain in the back itself. Pain that runs down a leg from a disc fragment pressing on a nerve is a nerve problem. It has a different anatomy and a different treatment. The disc is only where it started. That is why pain running down the leg rules out this injection.

What makes degenerative disc disease worse?

Anything that starves the disc. The adult disc has no blood supply of its own. It is fed by diffusion through the vertebral endplates. In a review of genetic studies, time spent watching television carried the largest lifestyle effect. It was larger than body mass index, smoking, triglycerides or type 2 diabetes, which also raised risk. Movement loads and rehydrates the disc. A body that does not move starves it.

Why does a pain clinic check my blood sugar and cholesterol for back pain?

Because the disc depends on diffusion through the endplates, and that diffusion is the first thing insulin resistance degrades. Research also links blood vessel disease and lipid status to disc degeneration. That is a hypothesis with real support, not a settled fact. So your glycemic status, a lipid panel and a blood-pressure reading are part of a back assessment here, not an unrelated errand.

Related reading

• Injury and work comp
• Spine and sacroiliac joint
• PRP for facet joints
• Platelet lysate
• Failed back surgery
• What a static image cannot show after an injury