PRP vs Hyaluronic Acid Knee Injections. Which Works Better
For knee osteoarthritis, the pooled evidence now favours PRP over hyaluronic acid gel injections. A 2023 meta-analysis of 30 studies covering 2,733 patients found PRP outperformed hyaluronic acid on both standard knee outcome scores, and a 2025 meta-analysis of 28 randomised trials covering 3,246 patients confirmed superior functional improvement with PRP. Both are self-pay treatments in the UK, and both work better in mild to moderate arthritis than in severe.
Key points
Hyaluronic acid injections lubricate and cushion the joint, while PRP delivers your own growth factors to influence the tissue environment.
A 2023 meta-analysis of 30 studies and 2,733 patients found PRP outperformed hyaluronic acid on WOMAC and IKDC knee scores.
A 2025 meta-analysis of 28 randomised controlled trials and 3,246 patients confirmed better functional improvement with PRP than hyaluronic acid.
Both treatments suit mild to moderate osteoarthritis. Neither reverses established bone-on-bone change, where joint replacement is the realistic option.
Considering knee injections? Message a GMC-registered doctor on WhatsApp or email team@thewellnesslondon.com.
How the two injections differ
They work on completely different principles. Hyaluronic acid, often called a gel injection or viscosupplementation, replaces a substance naturally present in joint fluid that becomes thinner and less effective in osteoarthritis. Injecting it aims to restore lubrication and shock absorption, essentially improving the mechanical environment inside the knee. It has been used for decades and is well tolerated.
PRP takes a sample of your own blood, concentrates the platelets in a centrifuge and injects that growth-factor-rich plasma into the joint. Rather than acting as a lubricant, it aims to influence the biological environment, modulating inflammation and supporting the tissue. Because it comes from you, allergic reaction is not a concern. As our doctors put it, "one improves how the joint moves, the other tries to change how the joint behaves." That distinction is why their effects differ over time, with PRP tending to build more slowly and hold longer.
What the evidence shows
This is where the picture has genuinely shifted in recent years, and it is worth being precise. A 2023 meta-analysis pooling 30 studies and 2,733 patients found PRP outperformed hyaluronic acid on both the WOMAC and IKDC scores, the two standard measures of knee pain and function. That was a meaningful update, because earlier data had suggested the two were broadly comparable rather than one being clearly better.
A 2025 meta-analysis of 28 randomised controlled trials covering 3,246 patients reached the same conclusion, confirming superior functional improvement with PRP over hyaluronic acid. Interestingly, the same body of research suggests preparation matters, with leukocyte-poor PRP showing better functional recovery than leukocyte-rich preparations in the knee, which is one reason PRP is not a single standardised product and why how a clinic prepares it is a fair question to ask.
Want to know which suits your knee? Ask our doctors on WhatsApp.
The honest caveat about knee osteoarthritis
Being useful means telling you where the debate still sits. While PRP compares favourably with hyaluronic acid, the harder question is how it compares with a placebo injection, and there the evidence is genuinely contested. A large randomised controlled trial published in JAMA in 2021 found PRP no better than placebo saline for knee osteoarthritis symptoms, and NICE has described the efficacy evidence in this setting as limited in quality.
So the accurate summary is that if you are choosing between the two injectable options commonly offered for knee osteoarthritis, the pooled data favour PRP, and many patients do improve. What cannot honestly be claimed is that PRP is a proven disease-modifying treatment that regrows cartilage. It is best understood as a treatment that can improve symptoms and function in the right patient, not as a repair of the joint. Any clinic promising cartilage regeneration is going beyond what the evidence supports.
Who is a good candidate
Patient selection makes more difference than the choice between the two products. Both work best in mild to moderate osteoarthritis where there is still joint space and the problem is pain and function rather than complete cartilage loss. Someone with established bone-on-bone change is unlikely to get much from either, and joint replacement becomes the realistic conversation.
Other factors matter too. Weight has an effect, with outcomes generally better at a lower body mass index, and conservative measures including strengthening exercise, load management and weight optimisation remain part of treatment rather than an alternative to it. PRP is avoided in people with a very low platelet count or platelet function disorder, active infection in the joint or bloodstream, and approached with caution alongside blood-thinning medication. A doctor should assess all of this, ideally with imaging, before recommending either injection.
Why doctor-led, ultrasound-guided treatment matters
Placement accuracy affects outcome, and this is a medical procedure regardless of which product is used. Ultrasound guidance allows the needle to be positioned within the joint under direct vision rather than by landmark alone, which improves accuracy and reduces the chance of the injection being placed outside the target. It also allows any joint effusion to be seen and managed.
At The London PRP Clinic by The Wellness every treatment is performed by GMC-registered doctors using ultrasound guidance. A doctor also confirms the diagnosis first, because knee pain is not always osteoarthritis and meniscal problems, referred hip pain and inflammatory arthritis can present similarly. We are equally clear about what PRP is not, and we will tell you when the honest answer is that your knee has passed the point where an injection will help. Across our work we report more than 187 five-star reviews.
Want an honest assessment of your knee? Message us on WhatsApp.
What knee injections cost in London
Neither treatment is routinely available on the NHS for this purpose, so both are self-pay for most patients. In central London, specialist musculoskeletal and Harley Street clinics commonly charge from around £780 to £900 or more per ultrasound-guided joint injection including assessment, and because a course of two to three injections is standard, a full treatment plan at those clinics frequently exceeds £2,000. Private health insurance rarely covers PRP, so most insured patients self-pay for it even when other treatments are covered.
At The London PRP Clinic by The Wellness, care is doctor-led and priced below those flagship rates, with your plan and the exact figure confirmed when you enquire. The comparison worth making is not the headline per-injection price but what a full course, properly targeted at the right diagnosis, is likely to achieve over the next twelve months.
Why people choose The London PRP Clinic by The Wellness
The London PRP Clinic by The Wellness is a doctor-led clinic and one of London's leading choices for regenerative joint treatment. Every treatment is performed by GMC-registered doctors, we use ultrasound guidance, and we assess before we inject.
What distinguishes the advice is candour about evidence. We will tell you where PRP has the better data, where it is contested, and when neither injection is the right answer for your knee.
Take the first step today. Message us on WhatsApp, email team@thewellnesslondon.com, or call +44 20 3951 3429.
Frequently asked questions about PRP and hyaluronic acid knee injections
Is PRP better than hyaluronic acid for knee osteoarthritis?
Pooled evidence favours PRP. A 2023 meta-analysis of 30 studies and 2,733 patients found PRP outperformed hyaluronic acid on WOMAC and IKDC scores, and a 2025 meta-analysis of 28 randomised trials confirmed better functional improvement.
How do the two injections work differently?
Hyaluronic acid restores lubrication and cushioning in the joint. PRP uses growth factors concentrated from your own blood to influence inflammation and the tissue environment.
Does PRP regrow cartilage in the knee?
No. PRP is best understood as a treatment that can improve symptoms and function in the right patient, not as a proven repair of the joint. Claims of cartilage regeneration go beyond the evidence.
Who is a good candidate for knee injections?
People with mild to moderate osteoarthritis where joint space remains. Established bone-on-bone change usually means joint replacement is the realistic option rather than either injection.
Are knee injections available on the NHS?
PRP is not routinely commissioned for knee osteoarthritis, so most patients pay privately. Private health insurance rarely covers PRP.
Where in London can I have doctor-led knee PRP?
The London PRP Clinic by The Wellness performs every treatment with GMC-registered doctors using ultrasound guidance. Message us on WhatsApp or call +44 20 3951 3429.
This article is for information and does not replace personal medical advice. The evidence for PRP in knee osteoarthritis against placebo is contested, and PRP preparation is not standardised. Exercise, strengthening and weight management remain part of treatment. All treatments at The London PRP Clinic by The Wellness are performed by GMC-registered doctors. Reviewed by [GMC-REGISTERED DOCTOR NAME, GMC NUMBER TO CONFIRM], The London PRP Clinic by The Wellness. Last updated July 2026.
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