Arthrosamid Injection

Can You Have a Second Arthrosamid Injection? Repeat Treatment Explained

16 September 2026

9 min read

Man with curious expression pointing to red inflamed knee asking about second Arthrosamid injection

✅ Medically reviewed | Updated July 2026

Knee pain has a habit of creeping back into conversation, especially once you’ve found something that finally worked. If Arthrosamid gave you months or years of comfortable movement, it’s natural to wonder what happens when that relief starts to fade. Do you simply book another appointment? Does the clinic top you up like a hyaluronic acid course? Or does something completely different happen at that stage?

This question matters more than people realise, because Arthrosamid doesn’t behave like the injections most patients are used to. Understanding how it actually works inside the knee changes the entire conversation about “repeat treatment.” Below, we walk through what a second Arthrosamid injection actually involves, why the answer isn’t as simple as “yes” or “no,” and what genuinely determines whether repeat treatment makes sense for your knee.

What Is Arthrosamid Injection?

Arthrosamid is a non-surgical treatment for suitable patients with knee osteoarthritis. It is a non-biodegradable hydrogel made from 97.5% water and 2.5% cross-linked polyacrylamide. Doctors inject it directly into the knee joint under ultrasound guidance.

Unlike steroid or hyaluronic acid injections, which coat or lubricate the joint temporarily, Arthrosamid integrates with the synovial tissue lining the knee. The joint’s natural filtering process gradually draws the hydrogel into the synovial membrane, and official materials describe this integration as largely complete within four to six weeks.

This is the first clue as to why “second injection” questions are more nuanced than they first appear.

How Arthrosamid Works

Arthrosamid follows a defined process once it enters the joint:

Doctors inject the hydrogel into the synovial cavity after applying local anaesthetic.
The joint’s filtering system gradually absorbs the hydrogel into the synovial membrane.
The hydrogel integrates with the tissue, which may increase elasticity and resilience.
Because the material is non-biodegradable, it isn’t broken down the way many other injectables are.

This last point is central to understanding repeat treatment. Arthrosamid isn’t designed to disappear and require topping up on a schedule. Published follow-up studies report sustained improvements in pain and function for up to five years after a single injection in study participants, though individual outcomes vary considerably.

The Science Behind Arthrosamid Injection

The science focuses on the synovial membrane, the soft tissue lining inside the knee. After injection, the hydrogel becomes incorporated into this tissue over time rather than sitting in the joint space as a temporary cushion.

Clinical evidence includes a randomised controlled trial comparing Arthrosamid with hyaluronic acid, which found Arthrosamid non-inferior over 12 months, alongside a 2025 study reporting sustained improvements in pain, stiffness, and function through five years of follow-up. This long-acting mechanism is precisely why Arthrosamid is usually described as a single-injection treatment rather than a repeatable course.

What Arthrosamid Injection Treats

Arthrosamid treats the symptoms of knee osteoarthritis. It doesn’t cure arthritis or reverse joint damage, but for suitable patients, it may:

Reduce persistent knee pain that hasn’t responded to rest or physiotherapy
Ease morning stiffness and stiffness after inactivity
Improve range of movement, including bending and straightening
Reduce swelling around the knee
Restore confidence in everyday movement like stairs and walking

Not all knee pain comes from osteoarthritis, so a proper clinical assessment is essential before assuming Arthrosamid is the right fit.

So Can You Actually Have a Second Arthrosamid Injection?

Here’s where clarity matters. According to official Arthrosamid Injection materials, the treatment is designed and studied as a single injection, with clinical evidence supporting relief for up to five years in suitable patients. This differs fundamentally from steroid injections, which many patients repeat every few months, or hyaluronic acid, which often involves a short course of injections.

If your knee pain returns years after treatment, or if your osteoarthritis has progressed, the appropriate next step is a fresh consultation and clinical reassessment — not an automatic repeat booking. A consultant will review your current symptoms, examine the knee, and consider imaging where clinically appropriate to establish whether further intervention (which may or may not involve Arthrosamid again) suits your situation.

This is also why choosing an experienced, orthopaedic-led clinic matters so much. Decisions about repeat or further treatment should never be made without a doctor who understands your full history.

Why Timing and Reassessment Matter More Than “Repeating” Treatment

Patients sometimes assume that if one injection helped, a second must help even more. That assumption doesn’t hold for a treatment designed to integrate into joint tissue over years, not weeks. Because Arthrosamid works through a slow biological process rather than a quick top-up effect, rushing into another injection without reassessment could mean treating a knee that either:

Still has active benefit remaining from the original injection, or
Has changed enough clinically that a different approach is now more suitable

This is precisely why an honest consultation, not a sales appointment, sits at the centre of good Arthrosamid care.

Why Choose Arthrosamid Injection

For patients comparing treatment options, Arthrosamid sits in a distinct space: a single-injection, non-surgical treatment positioned between repeated short-term injections and more invasive procedures like knee replacement. Patients researching arthrosamid injection cost are often weighing durability and convenience alongside price, since fewer appointments and longer-lasting relief can offset a higher upfront cost compared to repeated steroid or hyaluronic acid courses.

Key reasons patients choose it include:

A single outpatient procedure under local anaesthetic, avoiding general anaesthetic entirely
Study follow-up data showing sustained relief up to five years
Minimal downtime, with most people resuming light activity within days
A hydrogel designed to integrate with joint tissue rather than wash out quickly

Arthrosamid Injection Cost UK

Cost is one of the most searched questions alongside “second injection,” so it deserves a clear answer. At Dr SNA Clinic in London, pricing is published transparently:

Single knee: £2,800 (reduced from £3,200)
Both knees: £5,300 (reduced from £6,400)
Consultation fee: £100, redeemable against treatment cost if you proceed
0% finance available for patients who want to spread the cost

Every treatment includes a comprehensive consultation, the ultrasound-guided injection itself, and follow-up assessment. Prices are correct at the time of publication and are always confirmed at consultation before any commitment is made.

Arthrosamid Injection Near Me

If you’re searching for arthrosamid injection near me in London or further afield, Dr SNA Clinic on Wimpole Street, Marylebone, is worth considering. Every Arthrosamid procedure at the clinic is performed personally by Mr Syed Nadeem Abbas, MBBS, MRCSEd, an orthopaedic-trained consultant with over six years in NHS Trauma and Orthopaedics, including posts at Cambridge and Oxford.

Mr Abbas holds specialist Arthrosamid certification through the American Cellular Medical Association, making him one of a small number of UK clinicians formally trained specifically in this treatment. He doesn’t delegate the procedure to junior staff; from assessment through injection, he handles every step himself.

The clinic is CQC-regulated and GMC-registered, and appointments run Monday to Sunday, 10:00 to 18:00 UK time. You can reach the team by phone at +44 7955 836986 or +44 20 3846 7111, or visit in person at:

48 Wimpole Street, Marylebone, London W1G 8SF

What Happens at Your Consultation

Before any decision about a first or further injection, Mr Abbas will:

Take a detailed history of your symptoms and how they affect daily life
Review any available imaging, where clinically appropriate
Discuss all suitable options honestly, including whether Arthrosamid is or isn’t right for you
Answer every question you have, with no obligation to proceed on the day

Recovery and What to Expect Afterwards

Recovery is generally straightforward. Most patients go home the same day. Mild swelling, discomfort, or a feeling of fullness in the knee during the first few days is normal and doesn’t indicate treatment failure. Strenuous activity should wait until Mr Abbas confirms it’s safe to resume, and physiotherapy is often recommended to support recovery.

Most patients notice early changes around four weeks, with the clearest improvements typically appearing between eight and twelve weeks as the hydrogel integration process completes.

Safety Considerations for Repeat or First-Time Patients

Arthrosamid is considered low-risk when performed by a trained clinician in a regulated setting. Common side effects include mild pain, swelling, or temporary stiffness, which usually settle within days. Rarer risks include infection and hypersensitivity reactions, both of which are discussed fully at consultation. Patients with a known allergy to polyacrylamide, an active knee infection, or very recent knee surgery are not suitable candidates.

Watch: How Arthrosamid Works

For a visual explanation of the mechanism described above, Mr Abbas presents a short video series covering knee osteoarthritis and Arthrosamid’s mode of action on the Dr SNA Clinic YouTube channel, including a dedicated episode on how the treatment integrates with joint tissue.

Frequently Asked Questions

Is Arthrosamid meant to be repeated regularly?
No. Official materials describe it as a single-injection treatment, with clinical data supporting relief lasting up to five years in suitable patients.

What if my knee pain returns after a few years?
Book a fresh consultation. A consultant will reassess your knee and discuss whether further treatment, which may or may not include Arthrosamid, is appropriate.

Does a second injection cost the same as the first?
Pricing is confirmed individually at consultation based on your specific clinical situation, so speak to the clinic directly for an accurate quote.

Can both knees be treated in one visit?
Yes, both knees can be treated where clinically appropriate, following proper assessment and imaging review.

How soon will I know if treatment worked?
Most patients notice early changes around four weeks, with fuller results typically visible between eight and twelve weeks.

Final Thought

A second Arthrosamid injection isn’t something you schedule on autopilot — it’s a decision that depends on how your knee responds over time, how long relief lasts for you personally, and what a proper reassessment reveals. If your knee pain is returning or you’re considering Arthrosamid for the first time, the right next step is the same either way: book a consultation and get an honest, individual answer rather than a generic one.

Related Reading From Dr SNA Clinic

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