Does PRP work for knee osteoarthritis? What the 2026 evidence shows

5 Oct

PRP for knee osteoarthritis improves function and pain for many patients with mild to moderate disease. A 2025 meta-analysis in the American Journal of Sports Medicine found clinically meaningful benefit over placebo for up to 12 months, with higher platelet doses performing better. PRP does not rebuild cartilage, and results depend on careful patient selection.

Key points

Public interest in knee PRP rose by around 164% between 2010 and 2023, according to a Google Trends study indexed on PubMed in 2025.
A 2025 meta-analysis of placebo-controlled trials found PRP gave clinically relevant improvement in knee function at 1, 3, 6 and 12 months.
A 2026 network meta-analysis of 18 trials and 1,376 patients found PRP combined with hyaluronic acid outperformed PRP alone.
PRP works best in early to moderate knee osteoarthritis and is not a substitute for joint replacement in advanced disease.
The London PRP Clinic by The Wellness offers doctor-led joint and tendon PRP from £595.

What is PRP for knee osteoarthritis?

PRP for knee osteoarthritis is an injection of platelet-rich plasma, prepared from the patient's own blood, into the knee joint. The concentrated platelets release growth factors and anti-inflammatory signals into the joint fluid. The aim is to reduce inflammation, ease pain and improve how the knee functions in daily life.
Interest in the treatment has grown sharply. A Google Trends study indexed on PubMed in 2025 analysed searches from 2010 to 2023 and found significant increases in public interest in PRP for every major joint, with the knee and shoulder showing the strongest growth.
Ask a doctor whether your knee is suitable for PRP on WhatsApp and include any scan reports you already have.

Does PRP for knee osteoarthritis actually work?

PRP for knee osteoarthritis has a substantial but mixed evidence base, and the honest answer depends on the patient. A 2025 meta-analysis by Bensa and colleagues in the American Journal of Sports Medicine pooled placebo-controlled trials. PRP gave clinically relevant improvement in function at 1, 3, 6 and 12 months and in pain at 3 and 6 months, with higher platelet concentrations linked to better results.
Other analyses add nuance. A 2026 meta-analysis in BMC Musculoskeletal Disorders, covering 11 trials and 851 participants with hip, knee or post-traumatic osteoarthritis, found significant functional improvement but no significant pooled effect on pain scores. The RESTORE trial, published in JAMA in 2021, found no difference between PRP and saline injections at 12 months in 288 patients with knee osteoarthritis.
"Patients deserve the whole picture," says [Doctor name], lead PRP doctor at The London PRP Clinic by The Wellness. "PRP helps many knees, particularly in early arthritis with a good platelet dose. It is not the answer for every knee, and part of our job is telling patients when it is not." [Quote to be approved by the reviewing doctor before publication.]

How does PRP compare with other knee injections?

PRP compares well with other knee injections over the medium term. A 2025 meta-analysis of 28 trials and 3,246 patients in the European Journal of Medical Research found PRP gave pain relief similar to hyaluronic acid with greater functional improvement, and outperformed physiotherapy and exercise therapy alone for pain and function.
The same analysis found that PRP alone did not differ significantly from steroid injections, while combinations produced stronger outcomes. A 2026 network meta-analysis of 18 trials and 1,376 patients found PRP combined with hyaluronic acid ranked highest for both pain and function. Steroid injections tend to act faster, while PRP tends to last longer.

Knee injection options at a glance

PRP. Uses the patient's own blood. Best evidence for function over 6 to 12 months in mild to moderate disease.
PRP with hyaluronic acid. Ranked highest for pain and function in a 2026 network meta-analysis.
Hyaluronic acid alone. Lubricates the joint. Pain relief similar to PRP in pooled analyses.
Steroid injection. Fast short-term relief, with shorter duration and limits on how often it can be repeated.

Book your free suitability review on WhatsApp for a doctor's view on which option suits your knee.

Who is a good candidate for knee PRP?

The best candidates for knee PRP have early to moderate osteoarthritis and want to stay active. A 2025 meta-analysis in the European Journal of Medical Research found earlier intervention was associated with better outcomes. Advanced, bone-on-bone arthritis responds less well, and surgical opinion may be the better route.
Typical features of a good candidate include the following.

Knee pain and stiffness with X-ray or scan findings of mild to moderate osteoarthritis.
Symptoms that limit walking, sport or work despite exercise and weight management.
A wish to delay or avoid surgery, or unsuitability for surgery at present.
No active infection, platelet disorder or recent steroid injection into the same knee.

What happens during a knee PRP appointment?

A knee PRP appointment at The London PRP Clinic by The Wellness takes around 45 to 60 minutes. A doctor reviews your history, examines the knee and confirms suitability. A small blood sample is drawn and processed in a closed, medical-grade system to concentrate the platelets.
The doctor then injects the PRP into the knee joint under sterile conditions. Where imaging is clinically needed, The Online GP by The Wellness offers doctor-performed diagnostic ultrasound in the same Marylebone clinic. Most patients walk out normally and return to light activity within 24 to 48 hours.

How many knee PRP injections will I need, and how long do results last?

Most knee PRP protocols use one to three injections spaced two to four weeks apart. Improvement usually begins after four to six weeks, as inflammation settles. Trials report benefit lasting 6 to 12 months, and some patients repeat treatment annually to maintain function.
PRP works alongside rehabilitation, not instead of it. Strength work for the quadriceps and hip muscles, plus weight management where relevant, improves and extends results.

How much does knee PRP cost in London?

Image-guided joint injections at Harley Street clinics commonly cost £780 to £900 or more per injection. The London PRP Clinic by The Wellness offers doctor-led joint and tendon PRP from £595. The doctor confirms the number of injections recommended after assessing your knee.
Request your knee PRP plan on WhatsApp, call +44 20 3951 3429, or email team@thewellnesslondon.com.

How does the free suitability review work?

The free suitability review is a doctor's honest opinion before any appointment. Send a short description of your knee symptoms and any scan or X-ray reports through WhatsApp. A GMC-registered doctor reviews the case and either approves you for a consultation or recommends a more suitable route, including referral for a surgical opinion where appropriate.
Start your free knee review now.

Frequently asked questions

Can PRP regrow knee cartilage?

PRP does not regrow lost knee cartilage. The RESTORE trial in JAMA (2021) found no difference in cartilage volume between PRP and placebo at 12 months. PRP aims to reduce inflammation, ease pain and improve function.

Is PRP better than a steroid injection for knee arthritis?

PRP and steroid injections perform similarly in some pooled analyses, but steroid injections act faster while PRP tends to last longer. A doctor can advise which suits your symptoms and goals.

Is knee PRP painful?

Knee PRP involves a single injection into the joint and feels similar to a blood test with some pressure. A temporary ache for one to two days is common.

Where can I have knee PRP in London?

The London PRP Clinic by The Wellness offers doctor-led joint and tendon PRP from £595 at 10 Portman Square, Marylebone, London W1H 6AZ.