It is what laboratories use to grow human cells.

PLATELET LYSATE

Platelet lysate is platelets broken open on purpose, usually by freeze-thaw. That leaves a clear, acellular (cell-free) solution of the same growth factors PRP contains. They are already released and ready to act. It is what laboratories use to grow human cells. It is the only preparation here we are willing to put next to a nerve.

Why do laboratories use platelet lysate?

Before platelet lysate was an injection, it was a growth medium. Laboratories that grow human mesenchymal stromal cells need a supplement rich enough in growth factors to keep those cells dividing. Human platelet lysate has largely displaced fetal bovine serum for that job. It won on performance, not price.

That is a harder test than most orthobiologics ever face. A product that reliably grows human cells has a known, potent growth-factor profile. It is documented, and it is reproducible. The research calls it a potent and overlooked orthobiologic. Overlooked is the right word. Cell makers use it all the time. Clinics rarely talk about it.

What is the difference between platelet lysate and PRP?

Take platelets and break them open on purpose, usually by freeze-thaw. Then remove the membranes and debris. What remains is a clear, acellular solution packed with the same growth factors PRP contains: PDGF, TGF-β, VEGF, IGF and the rest of the secretome (everything the platelets release).

The difference from PRP is not concentration. It is state. PRP delivers whole platelets. They must survive, stick and degranulate (release their contents) in situ to release anything. Lysate delivers the released contents directly. Nothing has to work right after the needle comes out.

Two results follow, and both matter clinically. The growth factors are immediately bioavailable. They do not depend on cells behaving as intended in hostile tissue. And the product is acellular. It has no platelets, no red cells, and, critically, no leukocytes (white blood cells) at all. That is different from even a leukocyte-poor preparation. It is also thinner, which decides where it can go.

Why is platelet lysate used near a nerve?

This is the core of it. An irritated nerve root sits in a tight space. It does not tolerate the things a joint shrugs off. A gritty, cell-filled preparation placed against nerve tissue is the wrong physical object in the wrong place. You are putting particles and a load of inflammatory cells into a compartment where swelling itself is the problem.

Lysate answers both objections. Because it is acellular, it adds no neutrophils and no cell debris. Because it is thin, it spreads through tissue planes instead of sitting as a blob. That is what you want when the goal is to hydrodissect. That means using fluid to separate a nerve from the tissue sticking to it and tethering it, while delivering the biology at the same time.

That combination is why it is used here for perineural (around the nerve) and epidural work, and why standard PRP is not. It is not a lesser version of PRP. For this target it is the better-suited preparation. The reasoning is the same one behind the leukocyte-rich and leukocyte-poor distinction: match the preparation to the tissue, not to the marketing.

Where the evidence stands, and how to read it

The clinical research is smaller than PRP’s, and this page will not inflate it. A systematic review looked at preclinical and clinical studies in osteoarthritis. It found lysate a credible candidate. The signals were encouraging, and small trials stood behind them. Broader reviews call it a promising regenerative candidate. They name wound healing, tendon regeneration, ocular surface disease and nerve repair.

The right way to read that is not “unproven, therefore weak.” Lysate has been developed mainly as a manufacturing input. There, the business reason to run large clinical trials has never existed. Nobody owns it. No device company’s profit depends on proving it in a phase III program. The lack of large trials reflects the lack of a sponsor, not a record of failure. That is exactly the pattern set out on why the trials disagree.

Meanwhile the case for how it works is unusually solid. That is because labs use it at industrial scale for exactly the property we claim for it.

What is platelet lysate used for?

• Perineural injection where an irritated nerve is the target, not the joint it passes.
• Hydrodissection, to free a tethered nerve from the tissue around it while delivering growth factors into the plane.
• Epidural and foraminal work, where a cell-filled preparation is not appropriate. This relates to the picture on PRP for a herniated disc.
• Alongside spinal work where the pain source has been confirmed. The rule is set out on the spine and sacroiliac joint: nothing is injected until a block has told us the level is right.

What it will not do

It does not decompress a nerve. If a disc fragment or bony stenosis is physically pressing on a root, no injectate resolves that, and progressive weakness needs a surgical opinion rather than a biologic — promptly. It is not a substitute for the loading and behavioral work either, and it is not a stem cell treatment; there are no cells in it at all, which is rather the point.

What happens during a platelet lysate injection?

Blood is drawn and processed at the same visit. The injection is placed under ultrasound or fluoroscopic guidance without exception. Perineural work by landmark is not a technique; it is a hope. Volume is chosen on purpose. For hydrodissection you need enough to open a plane, which is a different math from filling a joint. The recovery timeline applies. The course after the injection is generally milder than after a leukocyte-rich tendon injection.

What people ask about lysate

Is lysate weaker than PRP?

No. It is prepared differently. The growth factors are already released. They are not waiting inside platelets that have to degranulate where they land. For a target where you do not want cells, having the contents without the container is the advantage, not a compromise.

Why not just use PRP near the nerve?

Because standard PRP is cell-filled and gritty, and a nerve in a tight space tolerates neither well. The leukocyte load is the specific objection. Lysate removes it entirely instead of reducing it.

Is there less evidence for it?

Fewer clinical trials, yes, and we say so. It is worth knowing why. Lysate is unpatented and has no sponsor. It earned its reputation in cell manufacturing, where it is tested constantly against a demanding standard.

Does it hurt more or less?

Generally less than a leukocyte-rich tendon injection. The product has no cells, and the deliberate inflammatory part is absent. So the days after the shot tend to be quieter.

How is platelet lysate made?

Your blood is drawn and processed at the same visit. The platelets are broken open on purpose, usually by freezing and thawing. The membranes and debris are removed. What remains is a clear liquid holding the same growth factors PRP contains, such as PDGF, TGF-beta, VEGF and IGF. They are already released and ready to act the moment it is injected.

Does platelet lysate contain white blood cells?

No. Lysate is acellular: no platelets, no red cells and no leukocytes at all. That is different from even a leukocyte-poor PRP. It is also thinner, so it spreads through tissue planes instead of sitting in one spot. Both properties are why it suits a nerve in a tight space, where inflammation and swelling are the problem.

Is platelet lysate a stem cell treatment?

No. There are no cells in it at all, which is the point. Platelet lysate is the released contents of platelets. It is not living cells of any kind. Its reputation comes from labs. There it has largely replaced fetal bovine serum as the supplement used to grow human stromal cells. The reason is that its growth-factor profile is potent and reproducible.

Can platelet lysate fix a pinched nerve?

It does not decompress a nerve. If a disc fragment or bony stenosis (narrowing) is physically pressing on a nerve root, no injection resolves that. Weakness that keeps getting worse needs a prompt surgical opinion, not a biologic. What lysate can do is reach an irritated nerve. Through hydrodissection, it can free the nerve from the tissue tethering it while delivering growth factors into that plane.

Related reading

• Leukocyte-rich and leukocyte-poor PRP
• PRP for a herniated or bulging disc
• Spine and the sacroiliac joint
• Why the trials disagree
• How PRP works
• Risks and side effects