A Careful, Honest Comparison
ChondroFiller® vs
PRP
Both are clinic-delivered, ultrasound-guided injections — but one provides a physical scaffold for cartilage regeneration, and the other delivers a biological signal from your own blood. Different mechanisms, different goals, different prices. Here is the honest comparison.
Reviewed byProf Paul Lee MBBch, FRCS (Tr & Orth), PhDLast reviewed 1 May 2026Quick Answer
ChondroFiller® is a structural scaffold; PRP is a biological signal. ChondroFiller® places a collagen matrix into a defined cartilage defect so the body’s own cells can rebuild tissue over six to twelve months. PRP (platelet-rich plasma) concentrates growth factors from your own blood and is injected into the joint to reduce inflammation and support healing — it does not by itself form new cartilage. They are sometimes used together; they are not the same treatment, and they are not interchangeable.
The Headline Difference
ChondroFiller® vs PRP — the key difference
PRP works by delivering a concentrated dose of growth factors from your own platelets into the joint. The signal is anti-inflammatory and supportive, but PRP does not by itself create a structure for new cartilage to grow into. ChondroFiller® works the other way around — it provides the structure (a collagen scaffold inside the defect) so the body’s own cells can migrate in and lay down new cartilage matrix. Structure vs signal. Different jobs.
Mechanism of Action
How each treatment works
ChondroFiller® is a sterile type I/III collagen scaffold injected as a liquid directly into a mapped cartilage defect under ultrasound guidance. It sets into a gel that occupies the defect within minutes.
The patient’s own cells then migrate into the scaffold and lay down new cartilage matrix over six to twelve months. ChondroFiller® is structural and regenerative — it actually fills the defect.
PRP is prepared chairside from a small volume of the patient’s own blood. The blood is centrifuged to concentrate the platelets, and the resulting plasma — rich in growth factors such as PDGF, TGF-β and IGF-1 — is then injected into the joint, usually under ultrasound guidance.
The growth-factor signal is anti-inflammatory and supportive. PRP does not place a physical scaffold into a defect, and it does not by itself form new cartilage tissue.
How Long Results May Last
Duration and number of injections
Tissue formation over 6–12 months
6–12 months of symptom relief
Direct duration comparison is misleading — ChondroFiller® aims to rebuild tissue in a defined defect, PRP aims to modulate the joint environment with a growth-factor signal. They are measuring different things.
Treatment Course
Number of injections
Typically one injection course, with the box quantity (one, two or three) decided from MRI. Single visit. The originally implanted tissue is intended to be durable.
PRP is often given as a series of two or three injections spaced a few weeks apart, with annual repeat courses considered if the initial course helps. Some clinics offer a single PRP injection; the evidence is generally stronger for a course rather than a one-off shot.
Safety and Infection
Safety considerations
Both are outpatient injections with low overall complication rates. ChondroFiller® at London Cartilage Clinic is delivered under real-time ultrasound guidance with full sterile technique and routine IV antibiotic cover; the most serious risk is joint infection, which is rare.
PRP uses the patient’s own blood and so carries no transfusion risk, but it is still a joint injection and the same infection-prevention principles apply: ultrasound guidance, sterile technique and an experienced operator. PRP preparation also matters — kit type, spin protocol and whether the final product is leucocyte-rich or leucocyte-poor can affect outcomes and side-effect profile.
Patient Selection
Who each treatment may suit
ChondroFiller® is for patients with a focal cartilage defect visible on MRI — typically up to around 6 cm² of cartilage loss with reasonably preserved surrounding tissue. It is a defect-targeted treatment. See who is suitable for ChondroFiller?
PRP is most defensible in mild-to-moderate knee osteoarthritis where modulating the inflammatory environment is the primary goal, in selected tendinopathies (knee, hip, shoulder), and as a supportive adjunct in some cartilage and soft-tissue repair protocols. It is not the right answer for a large, well-defined cartilage defect that needs filling.
Some patients are good candidates for both at different points in their pathway. The decision and the order are made at consultation, with imaging review, not bundled at booking.
Cost and Value
What each treatment costs
At London Cartilage Clinic, ChondroFiller® costs from £3,000 for one box, £5,500 for two and £8,000 for three, all-in. See the ChondroFiller® cost guide.
PRP in the UK is typically priced per session at £500–£1,500 depending on kit type, joint and clinic. A typical course of two or three injections therefore approaches £1,500–£4,500 over a few weeks. The headline gap is meaningful, but the treatments are not interchangeable — pricing should not drive the clinical decision.
Our Honest Take
When we may recommend each
A focal cartilage defect on MRI where a regenerative scaffold can fill the space and support new tissue formation.
A patient who wants the most direct regenerative pathway for a defined defect rather than a course of supportive injections.
Cases where PRP alone has been tried and the underlying defect has not improved.
Mild-to-moderate knee osteoarthritis where the goal is modulating inflammation and extending the comfortable interval before more invasive treatment.
Tendinopathies and selected soft-tissue injuries where PRP has its strongest evidence base.
As a planned adjunct around a scaffold-based or surgical cartilage repair, where the treating clinician has decided it is part of the protocol.
When Each Is The Wrong Answer
When we would not recommend each
Diffuse joint inflammation without a focal cartilage defect where there is nothing for a scaffold to fill — PRP, an anti-inflammatory injection or another modality may be the better step.
Active infection or unwillingness to accept the conservative safety protocol.
A patient with a clear focal cartilage defect on MRI where a scaffold (ChondroFiller®) or a cell-based procedure is the more direct regenerative step.
Patients expecting PRP to regenerate cartilage — PRP does not by itself form new cartilage tissue. It is supportive and anti-inflammatory.
Bundled-by-default biologic add-on at the time of booking. Combination treatment should be planned at consultation after imaging review, not upsold on the day.
The Bottom Line
In summary
ChondroFiller® and PRP both have a place in modern regenerative medicine, but they do different jobs. ChondroFiller® fills a defined cartilage defect with a scaffold; PRP delivers a growth-factor signal into a joint or tendon environment. The two are sometimes paired in a planned protocol, but they are not interchangeable, and one is not a cheap version of the other. The right answer comes from imaging and a clear plan, not from picking whichever injection happens to be cheaper.
ChondroFiller® vs PRP
Frequently asked questions
Can I have ChondroFiller® and PRP together?
Sometimes, where it is part of a planned protocol agreed at consultation after imaging review — for example PRP at the time of, or shortly after, ChondroFiller® placement to support the early tissue-formation phase. We do not bundle PRP into every quote, and we do not upsell biologic add-ons on the day of the injection.
Is PRP a cheaper version of ChondroFiller®?
No. They do different jobs. PRP is a biological signal; ChondroFiller® is a physical scaffold. The headline price gap reflects that, not a discounted version of the same treatment.
I had PRP and it did not help. Will ChondroFiller® work?
That depends on what was being treated and what the imaging shows. If you have a focal cartilage defect that PRP alone could not fill — which would be expected, given PRP does not form new structural cartilage — ChondroFiller® may be a reasonable next step. We review the MRI before deciding.
Does PRP regenerate cartilage on its own?
The honest answer is: not in the structural sense. PRP delivers growth factors that modulate inflammation and support cell signalling, but it does not place new cartilage tissue into a defect. Where structural regeneration of a focal defect is the goal, a scaffold (ChondroFiller®) or a cell-based procedure (MACI, ACI) is more direct.
How many PRP sessions would I need before considering ChondroFiller®?
There is no fixed number. Where the imaging shows a focal cartilage defect from the start, going straight to a scaffold can be reasonable. Where the picture is inflammation-dominant or there is no defined defect, a course of PRP is sometimes the right first step. The decision is made at consultation, case by case.
How does the evidence compare?
PRP has a large but heterogeneous evidence base in knee osteoarthritis and tendinopathy, with results varying by preparation protocol. ChondroFiller® has cartilage-specific outcome data (IKDC, Harris Hip Score, MOCART MRI) with over 19,000 cases of clinical use across joints. See the ChondroFiller® clinical evidence page.
Book a ChondroFiller® Assessment – London
Natural cartilage regeneration starts with the right defect, the right operator, and the right plan.
Learn More about ChondroFiller
Deep dive into our clinical resources and patient guides.
Cost in the UK
ChondroFiller® cost in the UK from £3,000, what is included and why prices vary.
Suitability
Who is suitable for ChondroFiller® as an injection, and who may need caution.
Clinical Evidence
IKDC, Harris Hip Score and MOCART MRI outcomes for ChondroFiller® cartilage regeneration.
Self-Assessment
Five-question ChondroFiller® pathway self-assessment for Prevention, Regeneration, Combination, or Support.
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ChondroFiller® is a registered trademark of Meidrix Biomedicals GmbH. London Cartilage Clinic is not affiliated with or endorsed by Meidrix Biomedicals.