PRP For Knee Osteoarthritis In London. Who It Helps, Who It Does Not

PRP is offered for almost every knee and suits some of them. The single strongest predictor of whether it will do anything is how much cartilage is left, which means mild to moderate osteoarthritis responds and bone-on-bone disease generally does not. Anyone selling you a course without a scan and a frank conversation about severity is selling you the wrong thing.

Key points

  • PRP is most likely to help mild to moderate knee osteoarthritis, Kellgren-Lawrence grade 1 to 3, and is unlikely to help advanced grade 4 disease.

  • Exercise, strengthening and weight management are the core treatments for knee osteoarthritis in NICE guidance, and no injection replaces them.

  • NICE interventional procedures guidance has previously concluded that the evidence on PRP for knee osteoarthritis is not adequate to support routine use, and the trial literature remains mixed. [GUIDANCE REFERENCE AND CURRENT STATUS TO CONFIRM]

  • Corticosteroid gives faster relief that fades, and repeated steroid into a knee is not a long-term plan.

Knee pain that is limiting you? Message a GMC-registered doctor on WhatsApp or email team@thewellnesslondon.com.

What is actually happening in the joint

Osteoarthritis is not simple wear. It is an active process involving cartilage loss, changes in the underlying bone, low-grade synovial inflammation and thickening of the joint capsule. That is why it fluctuates, why it responds to load in both directions, and why two people with identical X-rays can have completely different symptoms.

Severity is graded on X-ray using the Kellgren-Lawrence scale, from grade 1 with doubtful narrowing to grade 4 with marked narrowing, large osteophytes and bone deformity. That grade matters for treatment planning more than the pain score does, because biological treatment needs tissue to work on.

Why grade decides the conversation

PRP delivers concentrated growth factors into the joint with the intention of modulating inflammation and supporting the remaining cartilage and synovium. Where there is cartilage left, that is a plausible target. Where the joint is bone on bone, there is no biological substrate and the honest answer is that an injection is unlikely to change anything for long.

That is the conversation people most often do not get. A grade 4 knee in a patient with significant pain and functional loss is an orthopaedic conversation about joint replacement, not a course of injections.

Not sure what grade your knee is? Ask our doctors on WhatsApp.

What the evidence shows

The literature on PRP in knee osteoarthritis is large, active and genuinely mixed, and it is worth saying so plainly rather than quoting only the favourable half.

Several randomised trials and meta-analyses have reported improvements in pain and function over 6 to 12 months compared with hyaluronic acid or saline, with the clearest signals in younger patients with less severe disease. Other high-quality trials have found no difference from placebo injection, and placebo response in knee injection trials is substantial.

The methodological problem running through all of it is that PRP preparation is not standardised. Platelet concentration, leucocyte content, activation method and injection volume vary between studies and between clinics, so trials are comparing products that are not the same. Until that is resolved, pooled estimates should be read with caution.

NICE interventional procedures guidance has previously concluded that the evidence on PRP for knee osteoarthritis is not adequate to support routine use, and PRP is not routinely commissioned by the NHS for this indication. [GUIDANCE REFERENCE AND CURRENT STATUS TO CONFIRM]

Our position is that PRP is a reasonable option in mild to moderate disease where core treatment has been done properly and symptoms persist, and that it should be declined in advanced disease.

What comes first

Strengthening and exercise

Exercise is the core treatment for knee osteoarthritis and the one with the strongest evidence, which surprises people who assume a worn joint should be rested. Quadriceps and hip strengthening reduces pain and improves function, and the effect size compares well with anything injectable.

It must be progressive and continued. A 6-week course that ends is not a treatment for a lifelong condition.

Weight management where relevant

Load through the knee is a multiple of body weight during walking and stair descent, so modest weight loss produces a disproportionate reduction in joint load. Where weight is a factor, this does more than any injection will.

Simple analgesia and topical treatment

Topical NSAIDs are recommended in NICE guidance for knee osteoarthritis and are frequently skipped in favour of something more dramatic.

Then injection, if it is still limiting you

Corticosteroid gives faster, shorter relief and has a role in settling a flare enough to let you start exercising. Repeated steroid into the same knee is not a long-term strategy and there are concerns about cartilage effects with frequent use.

PRP is the option where the aim is a longer window rather than a fast one, in a joint that still has something to work with.

What treatment costs in London

Image-guided joint and tendon PRP at specialist central London clinics commonly costs from around £780 to £900 or more per injection including assessment, with a course frequently exceeding £2,000. Outside central London the range is roughly £250 to £500, where injections are often performed without image guidance.

PRP is not routinely commissioned by the NHS for knee osteoarthritis and private insurance rarely covers it, so this is self-pay. Physiotherapy, corticosteroid injection and orthopaedic referral are all available on the NHS.

Our care is doctor-led and priced below flagship central London rates, with the figure confirmed after your free suitability review.

Ask whether your knee is a candidate. Message us on WhatsApp.

The suitability review

Every enquiry begins with a free doctor-led suitability review rather than a booking. A GMC-registered doctor takes your history, examines the knee, reviews or arranges imaging to establish severity, and gives one of two answers.

Approved, where the disease is mild to moderate, core treatment has been done and the expected benefit is explained honestly, including that PRP does not regrow cartilage.

Or not approved, which happens for two reasons. Advanced grade 4 disease, where the appropriate conversation is orthopaedic. Or a knee that has never had a proper strengthening programme, where the correct advice is to do that first.

We decline a meaningful share of these enquiries, and doing so is the reason the recommendations we do make are worth having.

Why people choose The London PRP Clinic by The Wellness

The London PRP Clinic by The Wellness is a doctor-led clinic treating from 10 Portman Square in Marylebone and the Light Centre in Belgravia. Every treatment is performed by GMC-registered doctors using image guidance, and no clinician treats a patient here until they have completed 100 supervised treatments.

We teach ultrasound-guided joint PRP to doctors through our Academy, and we tell patients where the evidence is weak rather than only where it is strong. Across our work we report more than 187 five-star reviews.

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

Frequently asked questions about PRP for knee osteoarthritis

Does PRP work for knee osteoarthritis?

The evidence is mixed. Several trials report improvement in pain and function over 6 to 12 months, with the clearest signals in less severe disease, while other high-quality trials find no difference from placebo. Preparation is not standardised, which limits how well studies can be compared.

Does PRP regrow cartilage?

No. It is not a cartilage regeneration treatment, and any clinic claiming otherwise is overstating it. The intent is to modulate inflammation and support the tissue that remains.

Is PRP suitable for bone-on-bone arthritis?

Generally not. Advanced grade 4 disease has little biological substrate to work with, and the appropriate conversation there is orthopaedic rather than injectable.

PRP or a steroid injection for my knee?

Steroid acts faster and fades sooner, and suits settling a flare. PRP aims at a longer window in a joint with cartilage remaining. Repeated steroid into the same knee is not a long-term plan.

What is the most effective treatment for knee osteoarthritis?

Progressive strengthening and exercise, with weight management where relevant. These are the core treatments in NICE guidance and no injection replaces them.

Will the NHS or my insurer pay for PRP?

PRP is not routinely commissioned by the NHS for knee osteoarthritis and private insurance rarely covers it, so treatment is self-pay.

This article is for information and does not replace personal medical advice. Evidence for PRP differs by condition, preparation is not standardised, and the evidence in knee osteoarthritis is mixed. 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 September 2026.

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