Arthrosamid vs PRP for Knee Pain: Which Should You Choose?

✅ Medically reviewed | Updated July 2026

Knee pain rarely waits for a convenient moment. It shows up on the stairs, during a morning walk, or when you try to kneel down in the garden, and it slowly narrows the life you used to live. If you have already tried rest, physiotherapy, and painkillers without lasting relief, you are probably weighing up two names that keep appearing in your research: Arthrosamid and PRP. Both promise a non-surgical route away from persistent knee osteoarthritis, yet they work in completely different ways, cost differently, and suit different types of patients. This guide breaks down both treatments honestly, in plain English, so you can walk into your consultation already understanding the real differences rather than marketing claims.

What Is Knee Osteoarthritis and Why Injections Help

Knee osteoarthritis develops when the cartilage protecting your joint gradually wears down. Bones then move closer together, and the synovial lining that cushions the joint becomes irritated and inflamed. NHS guidance confirms that stiffness, particularly in the morning or after rest, is a common symptom of this process.

Doctors cannot reverse osteoarthritis, but they can manage its symptoms. Injectable treatments aim to calm inflammation, support joint comfort, and help you move more freely again. This is where Arthrosamid and PRP enter the conversation, though they take very different paths to get there.

Why Patients Look Beyond Steroids and Hyaluronic Acid

Many patients try steroid injections first because doctors offer them quickly and cheaply. However, NICE guidance notes that steroid relief typically lasts only two to ten weeks. Hyaluronic acid injections face an even bigger obstacle: NICE actually advises against offering them for osteoarthritis management, since the evidence does not consistently support lasting benefit. This gap explains why patients increasingly search for longer-lasting alternatives.

How Arthrosamid Works

Arthrosamid is a non-biodegradable hydrogel made of 97.5% water and 2.5% cross-linked polyacrylamide. Doctors inject it directly into the knee joint under ultrasound guidance, and the hydrogel then integrates with the synovial membrane rather than simply lubricating the joint temporarily.

This integration process is what separates Arthrosamid from almost every other injectable option on the market. Once inside the joint, the hydrogel disperses within the synovial fluid before the joint’s natural filtering process gradually draws it into the synovial tissue. Official Arthrosamid materials describe this integration as largely complete within four to six weeks.

What Happens Inside the Joint

As the hydrogel settles into the synovial tissue, official materials report increased tissue elasticity and resilience. This process may support joint cushioning and reduce stiffness over time. Because Arthrosamid does not biodegrade, it is not broken down and reabsorbed the way many other injectable treatments are.

The Science Behind Arthrosamid Injection

Peer-reviewed research backs much of what Arthrosamid claims. A randomised controlled trial compared Arthrosamid against hyaluronic acid and found it non-inferior over 12 months, with clinically meaningful improvements in pain and function reported among participants.

A 2025 five-year follow-up study reported sustained improvements in pain, stiffness, function, and patient global assessment scores through to five years after a single injection. The same study reported no serious events attributed to the device and no new adverse effects during the extension period. Over 20,000 patients have received the treatment worldwide, according to official Arthrosamid messaging from January 2026.

It is worth noting that this evidence base, while growing steadily, remains smaller than long-established treatments. Published studies involve selected patient groups under controlled conditions, so individual results in everyday practice can vary.

How PRP Works for Knee Osteoarthritis

Platelet-rich plasma, or PRP, takes a completely different biological approach. Clinicians draw a small sample of your own blood, spin it in a centrifuge to concentrate the platelets, and then inject that concentrate back into your knee joint. The theory is that growth factors within the platelets encourage tissue repair and reduce local inflammation.

Because PRP is autologous, meaning it comes from your own body, allergic reaction risk stays low. However, NICE has noted that evidence supporting PRP’s efficacy for knee osteoarthritis is currently limited in quality. Clinics offering PRP must also follow special governance, consent, and audit or research arrangements, which reflects the treatment’s evolving evidence status.

Typical PRP Treatment Course

Unlike Arthrosamid’s single-injection design, PRP usually requires multiple sessions. Patients typically receive one to three treatments, spaced weeks apart, to build a cumulative effect. Results and duration vary considerably between individuals, and there is currently no equivalent five-year data supporting PRP’s longevity for knee osteoarthritis.

Arthrosamid vs PRP: Direct Comparison

Factor	Arthrosamid	PRP
Source material	Synthetic hydrogel	Your own blood
Number of injections	Single injection	Typically 1–3 sessions
Duration of effect	Up to 5 years in published follow-up studies	Variable; limited long-term data
Evidence quality	Randomised controlled trial plus 5-year follow-up	NICE notes evidence is limited in quality
Biodegradable	No	Yes, naturally
Governance requirements	Standard clinical consent	Special audit or research arrangements

Neither treatment suits every patient, and that is precisely why a proper clinical consultation matters more than any comparison chart.

What Arthrosamid Injection Treats

Arthrosamid is used for the symptomatic treatment of knee osteoarthritis. It does not cure arthritis or reverse existing joint damage. For suitable patients, it may help with:

Persistent Knee Pain

A deep ache inside or around the knee that worsens with activity or after long periods of sitting, and that has not responded to rest or medication.

Morning Stiffness and Reduced Mobility

Difficulty bending, straightening, or fully extending the knee, plus stiffness that eases only after moving around for a while.

Swelling and Reduced Confidence in Movement

Mild to moderate swelling around the joint, along with the hesitation many patients develop once they start anticipating pain during everyday activities.

Not all knee pain comes from osteoarthritis, so a thorough clinical assessment always comes before any treatment decision.

Why Choose Arthrosamid Injection

Patients often choose Arthrosamid because it sits neatly between short-term injections and invasive surgery. A single outpatient procedure, performed under local anaesthetic, may deliver years of symptom relief rather than weeks. There is no general anaesthetic, no incisions, and most patients go home the same day.

For some suitable patients, this may also help postpone the need to consider knee replacement surgery, although this outcome is never guaranteed and depends entirely on individual response to treatment.

Arthrosamid Injection Cost UK: What You Should Expect

Pricing varies between UK clinics, and transparency matters when you are comparing options. At Dr SNA Clinic on Wimpole Street, London, the published arthrosamid injection cost structure is as follows:

• Single knee treatment: £2,800 (reduced from £3,200), including enhanced recovery support with post-injection physiotherapy guidance and supplement advice
• Both knees treatment: £5,300 (reduced from £6,400), for suitable patients with symptoms affecting both knees following proper assessment
• Consultation fee: £100, redeemable against the treatment cost if you proceed
• 0% finance available to spread the cost, with no obligation to apply

Every package includes a comprehensive consultation, the ultrasound-guided injection itself, and follow-up assessment. Prices are correct at time of publication and confirmed again at consultation, so there are never hidden surprises.

Why Arthrosamid Injection Cost UK Varies by Clinic

The arthrosamid injection cost uk patients encounter can shift depending on whether the clinic includes aftercare, physiotherapy guidance, and follow-up review within the price, or charges separately for each stage. Always ask what is included before comparing headline figures between providers.

Arthrosamid Injection Near Me: Finding a Qualified Provider

Searching for arthrosamid injection near me should lead you to a properly regulated, experienced provider rather than the closest option geographically. Every Arthrosamid injection carries real technical demands: correct ultrasound placement, sterile procedure, and careful patient selection.

Dr Syed Nadeem Abbas performs every Arthrosamid injection personally at Dr SNA Clinic, from the initial assessment through to the procedure itself, without delegating any part of the process. He holds MBBS, MRCSEd, and an MSc with Distinction from Queen Mary University of London, alongside more than six years of NHS trauma and orthopaedic experience at hospitals including Cambridge and Oxford. His specialist Arthrosamid training was completed through the American Cellular Medical Association, placing him among a small group of UK clinicians formally certified in this specific treatment.

If you are based in or near London and searching for a genuine arthrosamid injection near me, Dr SNA Clinic sits at 48 Wimpole Street, Marylebone, London W1G 8SF, within the CQC-regulated setting patients expect for joint injection procedures.

What Happens During Your Consultation

Your first visit is a clinical assessment, not a sales pitch. Dr Abbas reviews your symptom history, examines your knee, and looks at any existing imaging. NICE guidance actually states that osteoarthritis is usually diagnosed clinically, without requiring imaging in every case, though scans may still be arranged where appropriate.

He will tell you honestly if Arthrosamid is not the right option for your knee, and he will discuss alternatives, including PRP, where relevant. There is no obligation to proceed on the day.

Recovery After Arthrosamid vs After PRP

Recovery timelines differ slightly between the two treatments. After Arthrosamid, most patients experience mild swelling or a feeling of fullness for a few days, with reduced activity recommended for three to five days. Noticeable improvement typically develops between four and twelve weeks as the hydrogel integrates.

After PRP, swelling and soreness are also common in the days following injection, though because the treatment usually spans multiple sessions, the overall recovery period extends across several weeks or months as the course progresses.

When to Contact Your Clinic

Regardless of which treatment you choose, contact your clinic promptly if you notice increasing redness, warmth, fever, or worsening pain rather than waiting for your scheduled follow-up.

Safety Considerations for Both Treatments

Arthrosamid is not suitable for patients with a known allergy to polyacrylamide, an active knee infection, recent knee surgery, or severe structural joint damage. Prophylactic antibiotics are typically given before the procedure to reduce infection risk, since it is administered under sterile conditions.

PRP carries a lower allergy risk given its autologous nature, but because it involves handling and reinjecting blood products, clinics must maintain strict governance and consent procedures throughout.

Booking Your Consultation

Appointments run through Dr SNA Clinic’s booking system, with the clinic operating from 10:00 to 18:00 UK time. You can reach the team directly by phone on +44 7955 836986 or via the office line at +44 20 3846 7111, or by emailing info@drsnaclinic.com. The clinic address is 48 Wimpole Street, Marylebone, London W1G 8SF.

Frequently Asked Questions

Is Arthrosamid better than PRP for knee osteoarthritis?
Neither is universally “better.” Arthrosamid offers a single injection with published five-year follow-up data, while PRP uses your own blood across multiple sessions with more limited long-term evidence. The right choice depends on your specific diagnosis and clinical assessment.

How much does Arthrosamid injection cost compared to PRP?
Arthrosamid at Dr SNA Clinic starts from £2,800 for one knee. PRP pricing typically differs since it usually involves multiple sessions rather than a single treatment; ask your clinic for a full breakdown before booking.

Can I switch from PRP to Arthrosamid if PRP does not work?
Yes, many patients try PRP first before exploring Arthrosamid. A consultation will assess your knee’s current condition and confirm suitability.

Does the NHS offer Arthrosamid or PRP for knee osteoarthritis?
Availability varies by NHS trust and region. Private clinics such as Dr SNA Clinic offer both treatments outside the NHS pathway, subject to consultation and clinical assessment.

Is Arthrosamid painful during the procedure?
Doctors apply local anaesthetic before injecting the hydrogel, which most patients tolerate well. Some mild discomfort or swelling afterwards is common and typically settles within a few days.

Final Thoughts

Choosing between Arthrosamid and PRP does not need to feel overwhelming once you understand how each treatment actually works inside the joint. Arthrosamid offers a single-injection approach backed by growing long-term evidence, while PRP draws on your body’s own healing response across a short course of sessions. The safest path forward is an honest conversation with an experienced clinician who will assess your knee properly and tell you, without pressure, which option genuinely fits your situation.

Related Reading From Dr SNA Clinic

• Arthrosamid Injection — Full Clinical Overview and Pricing
• Synovial Fluid: What It Is, Function and Why It Matters
• Can a Swollen Knee Be Dangerous?
• Knee Swelling and Pain Without Injury — Causes and Treatment
• Rheumatoid Arthritis: Symptoms, Causes and Treatment UK
• Joint Pain Treatment: Every Option Explained Honestly
• What Not to Do With Knee Arthritis
• Knee Pain Relief UK: Every Option Explained Honestly

Mr Syed Nadeem Abbas, MBBS, MRCSEd, MSc Aesthetic Plastic Surgery (Distinction) Medical Director, Dr SNA Clinic 48 Wimpole Street, Marylebone, London W1G 8SF GMC Registered | CQC Regulated | Monday to Saturday 10:00–18:00 +44 7955 836986 | info@drsnaclinic.com