Does PRP Actually Work. The Evidence, Condition By Condition

‍ ‍

PRP works well for some conditions, moderately for others and not reliably for a few, and clinics rarely make that distinction. The evidence is strong for pattern hair loss and tennis elbow, good for plantar fasciitis and patellar tendinopathy, mixed for Achilles tendinopathy and hip osteoarthritis, and contested for knee osteoarthritis. This page maps all of it, including the parts that do not help us.

‍ ‍

Key points

‍ ‍

For hair loss, a 2025 meta-analysis in Dermatology and Therapy pooled 43 randomised controlled trials and 1,877 participants and found that PRP increases hair density. For tennis elbow, a 2025 Level I meta-analysis of 26 randomised trials found PRP statistically and clinically better than corticosteroid beyond six months. For knee osteoarthritis the picture is contested, since pooled data favour PRP over hyaluronic acid but a 2021 randomised trial in JAMA found no benefit over placebo and NICE describes the evidence as limited in quality. Running through all of it, PRP is not a standardised product, and preparation differences are a genuine limitation across the whole literature.

‍ ‍

Want to know where your condition sits? Message a GMC-registered doctor on WhatsApp or email team@thewellnesslondon.com.

‍ ‍

How PRP is supposed to work

‍ ‍

A sample of your blood is spun in a centrifuge to separate and concentrate the platelets. Platelets carry growth factors that the body uses in tissue repair, and the concentrated plasma is injected into the target tissue to stimulate that repair process. Because the material comes from you, allergic reaction is not a meaningful concern, and reported adverse effects across the literature are consistently mild and local.

‍ ‍

The mechanism is plausible and well described, but plausibility is not evidence of effect, which is why the trial data matter more than the biology. It is also why the same treatment performs differently across conditions. Stimulating repair helps a tendon that has failed to heal far more predictably than it helps a joint where cartilage has already been lost.

‍ ‍

Hair loss. Strong evidence

‍ ‍

This is where PRP is best supported. The 2025 meta-analysis published in Dermatology and Therapy pooled 43 randomised controlled trials covering 1,877 participants and concluded that PRP increases hair density in androgenetic alopecia. Pooled figures show density rising from roughly 142 to 178 hairs per square centimetre.

‍ ‍

Two further findings are practically useful. A dose relationship appears in the data, with a greater number of treatments per month associated with larger density gains, which is what you would expect from a real effect rather than noise. And combination outperforms monotherapy, with pooled data showing PRP plus minoxidil producing better density than either alone.

‍ ‍

The limits are equally clear. PRP does not regrow hair from follicles that have already closed or scarred, it does not stop the underlying genetic process, and maintenance is required. It is also not an established treatment for the scarring process in conditions such as frontal fibrosing alopecia or central centrifugal cicatricial alopecia.

‍ ‍

Tendons. Strong to good evidence

‍ ‍

Tennis elbow has the best tendon evidence. The 2025 meta-analysis of 26 randomised controlled trials, graded Level I, found corticosteroid produced better pain scores in the first two months but by a margin below the minimal clinically important difference, no significant difference between two and six months, and PRP statistically and clinically better beyond six months. A network meta-analysis of 20 randomised trials found the same pattern, ranking PRP first for long-term pain, disability and function.

‍ ‍

Plantar fasciitis is well supported, with an updated systematic review and meta-analysis finding PRP produced statistically and clinically better long-term functional improvement than corticosteroid. Patellar tendinopathy is generally regarded as one of the better-supported tendon indications.

‍ ‍

The unifying explanation is that these are degenerative rather than inflammatory conditions. Anti-inflammatory injection relieves symptoms briefly without changing the tissue, which is why steroid wins early and loses late.

‍ ‍

Want an honest read on your case? Ask our doctors on WhatsApp.

‍ ‍

Knee osteoarthritis. Contested evidence

‍ ‍

Here the picture splits depending on the comparison. Against hyaluronic acid gel injections, pooled data favour PRP. A 2023 meta-analysis of 30 studies covering 2,733 patients found PRP outperformed hyaluronic acid on both WOMAC and IKDC scores, and a 2025 meta-analysis of 28 randomised trials covering 3,246 patients confirmed better functional improvement.

‍ ‍

Against placebo, the picture is different. A large randomised controlled trial published in JAMA in 2021 found PRP no better than placebo saline injection for knee osteoarthritis symptoms, and NICE describes the efficacy evidence in this setting as limited in quality.

‍ ‍

Both statements are true, and the honest summary is that PRP is a reasonable option if you are choosing between the injectable treatments commonly offered, while the claim that it is a proven disease-modifying treatment that regrows cartilage is not supported. Any clinic promising cartilage regeneration is going beyond the data.

‍ ‍

Hip osteoarthritis and Achilles tendinopathy. Mixed evidence

‍ ‍

For the hip, a systematic review of five randomised clinical trials with sample sizes from 43 to 111 patients found all five reported significant pain reduction and functional improvement, with no major adverse events. A separate meta-analysis found no significant reduction in pain compared with controls. Research in the hip also suggests leukocyte-poor preparations produce greater pain reduction than leukocyte-rich, and that a single injection may outperform multiple.

‍ ‍

For the Achilles, some studies report improvement in pain, function and tendon structure over six to twelve months, while other trial evidence has not shown clear benefit over control injection. The tendon is also one where progressive loading rehabilitation remains the first-line treatment and outperforms most alternatives when properly executed.

‍ ‍

Promising is the accurate word for both, and proven is not.

‍ ‍

Want the evidence applied to your case? Message us on WhatsApp.

‍ ‍

The honest weakness across the whole literature

‍ ‍

One limitation runs through all of it and deserves stating. PRP is not a standardised product. Kits, spin protocols, platelet concentration and whether white cells are included all vary between studies and between clinics, which makes trials harder to compare and means two treatments sold under the same name may differ materially.

‍ ‍

This has consequences for you. It means the evidence for PRP in general is not automatically evidence for the specific PRP a given clinic provides, and it makes preparation method a reasonable question to ask. It is also why we regard clinics that decline to discuss their preparation as a warning sign.

‍ ‍

We think patients are better served knowing this than not. Evidence-led care means acting on what the data support, and saying plainly where they do not.

‍ ‍

What this means for your decision

‍ ‍

Three practical conclusions. First, ask which column your condition falls into before you spend, because the answer for tennis elbow is not the answer for knee osteoarthritis. Second, diagnosis still outranks treatment choice, since NICE and the British Association of Dermatologists both stress identifying the underlying cause first, and untreated contributors such as low ferritin or thyroid dysfunction blunt any hair treatment. Third, judge a clinic by whether it tells you this unprompted.

‍ ‍

Every enquiry with us begins with a free doctor-led suitability review rather than a booking. A GMC-registered doctor assesses you and either approves treatment with a clear plan, or declines and explains what would serve you better. We turn away a meaningful share of enquiries, which is a direct consequence of taking the evidence seriously.

‍ ‍

For context on cost, flagship Harley Street and Mayfair clinics commonly charge £600 to £850 or more per hair session, and central London specialist clinics charge from around £780 to £900 or more per image-guided joint injection with courses often exceeding £2,000. Our care is doctor-led and priced below those rates, confirmed after your review.

‍ ‍

Why people choose The London PRP Clinic by The Wellness

‍ ‍

We are doctor-led and blood-test-first. Every treatment is performed by GMC-registered doctors, image guidance is used for joint and tendon work, and no clinician treats a patient here until they have completed 100 supervised treatments. We also train other clinicians in these techniques through our Academy.

‍ ‍

Across our work we report an 87 percent patient success rate, a 32 percent average density increase in hair restoration and more than 187 five-star reviews. Those figures exist alongside the willingness to publish a page like this one, and the two are related.

‍ ‍

Book your free suitability review. Message us on WhatsApp, email team@thewellnesslondon.com, or call +44 20 3951 3429.

‍ ‍

Frequently asked questions about the PRP evidence

‍ ‍

Does PRP actually work?

‍ ‍

It depends on the condition. The evidence is strong for pattern hair loss and tennis elbow, good for plantar fasciitis and patellar tendinopathy, mixed for hip osteoarthritis and Achilles tendinopathy, and contested for knee osteoarthritis.

‍ ‍

What is the strongest evidence for PRP?

‍ ‍

For hair loss, a 2025 meta-analysis of 43 randomised controlled trials and 1,877 participants finding increased hair density. For tendons, a 2025 Level I meta-analysis of 26 randomised trials favouring PRP over corticosteroid in tennis elbow beyond six months.

‍ ‍

Does PRP regrow cartilage?

‍ ‍

No. That claim is not supported by the evidence. PRP may improve symptoms and function in the right patient, but it is not a proven disease-modifying treatment for osteoarthritis.

‍ ‍

Why do studies disagree about PRP?

‍ ‍

Largely because PRP is not standardised. Kits, spin protocols, platelet concentration and white cell content vary between studies and clinics, which makes trials difficult to compare.

‍ ‍

Is PRP better than steroid injection?

‍ ‍

For chronic tendon conditions, steroid works faster in the first weeks while PRP performs better beyond six months, and steroid carries risks with repeated use that PRP does not.

‍ ‍

How do I know if PRP will work for me?

‍ ‍

That requires assessment of your specific diagnosis and, for hair, blood tests. Our free suitability review gives you a clear answer either way, including when the answer is no.

‍ ‍

This article is for information and does not replace personal medical advice. Evidence differs by condition and PRP preparation is not standardised. Individual results vary and no outcome is guaranteed. All treatments at The London PRP Clinic by The Wellness are performed by GMC-registered doctors. Reviewed by the medical team at The London PRP Clinic by The Wellness. Last updated August 2026.

<!-- JSON-LD SCHEMA. Paste into Squarespace page header code injection --> <script type="application/ld+json"> </script>