Does PRP therapy actually work for knee arthritis?
Knee osteoarthritis is one of the better-studied uses of PRP, and a number of trials have reported improvement in pain and function compared with hyaluronic acid or saline, particularly in mild to moderate arthritis. The evidence is not uniform — study quality and PRP preparation methods vary widely — and PRP does not regrow lost cartilage. It is better understood as potentially improving symptoms and function for a period of time than as reversing the arthritis itself.
Where it tends to do better
Reported outcomes are generally stronger in mild to moderate osteoarthritis than in severe, bone-on-bone joints where little cartilage remains. Younger patients and those with lower body mass index have also tended to do better in published series.
This is one reason imaging matters before treatment. A knee that has already lost most of its joint space is a different proposition from one with early to moderate change, and you deserve to be told which one you have.
Why results vary so much between studies
There is no single standardised PRP. Preparations differ in platelet concentration, whether white blood cells are included, activation method, injection volume, and number of injections. Trials using meaningfully different products are frequently pooled together, which makes the overall literature look noisier than it is.
The practical implication is that asking what specifically is being injected, and how many times, is a fair and relevant question.
What a realistic expectation looks like
Improvement, when it comes, typically builds over several weeks rather than appearing immediately, and studies reporting benefit generally describe it over a period of months rather than permanently. Some patients return for repeat treatment; some do not respond at all.
PRP is also not a substitute for the things that reliably help arthritic knees — strengthening, load management, and weight where relevant. It works best as part of that picture rather than instead of it.
More about PRP Treatments
Find out where your knee actually sits
Book a consultation with our Folsom naturopathic team to review your imaging and get an honest read on whether PRP is worth trying for your knee.
Bring recent lab work if you have it — we’ll review it with you.
Medical disclaimer: The information on this page is for general education and is not medical advice, diagnosis, or treatment. It summarizes published research in general terms and does not claim, guarantee, or imply any outcome for any individual. PRP is not FDA-approved for the treatment of osteoarthritis and this use is off-label. Individual results vary. Whether PRP is appropriate for you can only be determined after an in-person evaluation with a licensed provider.