If knee osteoarthritis is limiting how you move, work, or exercise, and cortisone or hyaluronic acid injections have stopped giving lasting relief, you may have come across Arthrosamid knee injection treatment. It's a newer, longer-acting option for managing osteoarthritis pain, but it isn't the right fit for everyone, and understanding what it actually does, and doesn't do, helps you decide whether it's worth exploring.
This guide covers how Arthrosamid works, who tends to benefit most, what the appointment itself involves, and how it compares with the other knee injections you may already have tried.
What is an Arthrosamid knee injection?
Arthrosamid is a polyacrylamide hydrogel, a soft, cushioning gel, injected directly into the knee joint under ultrasound guidance. Once in place, it integrates with the surrounding soft tissue to add lubrication and shock absorption within the joint, easing the friction that drives osteoarthritis pain. Unlike hyaluronic acid, which the body gradually breaks down, Arthrosamid is designed to remain in the joint rather than degrade over time, which is why it's positioned as a longer-lasting option than traditional gel injections. Clinical studies to date report a favourable safety profile, though, as with any relatively new treatment, longer-term outcome data is still being gathered, which is part of why NICE has not yet issued formal guidance on its use.
Who does Arthrosamid help?
Arthrosamid is aimed at adults with mild to moderate knee osteoarthritis who haven't had lasting relief from first-line treatments such as exercise therapy, weight management, or corticosteroid injections, and who want to delay or avoid surgery. It's generally not recommended for very advanced, bone-on-bone osteoarthritis, where joint replacement is likely to offer a more complete solution, or for knee pain caused by something other than osteoarthritis, such as a meniscus tear or ligament injury, both of which need a different treatment pathway entirely. A face-to-face consultation, including an ultrasound scan, is the only reliable way to confirm whether your knee is a good candidate, since imaging shows the extent of joint space narrowing and cartilage wear that symptoms alone can't fully reveal.
Can you get an Arthrosamid injection on the NHS?
Arthrosamid injection NHS availability is limited. At present, Arthrosamid isn't included in NICE guidance for knee osteoarthritis; the technology wasn't selected for a full evaluation due to insufficient long-term evidence, and NHS commissioning remains restricted mostly to research settings rather than routine care. A small number of NHS trusts have run early research studies involving Arthrosamid, but this is not the same as it being routinely offered to patients through standard referral pathways. In practice, this means Arthrosamid is a privately funded treatment for the vast majority of NHS patients in England, in the way that many CQC-regulated MSK clinics currently deliver it. Standard NHS treatment for knee osteoarthritis still centres on physiotherapy, weight management advice, and corticosteroid injections, which remain widely available and effective for many patients, even if they don't offer the same duration of relief.
What does an Arthrosamid knee injection cost, and is it worth it?
Arthrosamid injection cost varies by clinic, but typically includes the consultation, ultrasound assessment, the injection itself, and follow-up. Whether it's worth it depends on how much your knee pain is limiting daily life, how you've responded to previous treatments, and how you weigh a higher upfront cost against the shorter-acting, repeat nature of steroid or hyaluronic acid injections. For some patients managing persistent pain despite conservative care, the longer duration of relief can represent good value over several years; for others, particularly with early or mild symptoms, a stepped approach starting with physiotherapy and simpler injections makes more clinical sense. Because Arthrosamid isn't reimbursed by the NHS and typically isn't covered by standard private medical insurance policies, most patients fund the treatment themselves, so it's worth getting a clear, itemised quote before committing.
What happens during an Arthrosamid injection appointment?
The procedure is minimally invasive and carried out as an outpatient appointment. After a local anaesthetic, a fine needle delivers the Arthrosamid hydrogel directly into the knee joint under real-time ultrasound guidance, which helps the clinician place it accurately and avoid surrounding structures. The injection itself typically takes only a few minutes, and most patients can resume light activity shortly afterwards, though your clinician will advise on any short-term precautions specific to your knee. It's common to be advised to avoid strenuous exercise or heavy lifting for a short period afterwards, whilst gentle movement is usually encouraged to help the joint settle.
Are there risks or things to know before booking?
As with any joint injection, there's a small risk of infection, swelling, or temporary discomfort at the injection site, and Arthrosamid should only be delivered by an appropriately trained, HCPC-registered clinician using ultrasound guidance for accurate placement. Because the hydrogel is designed to remain in the joint rather than break down, it isn't easily reversed if your circumstances change, so it's worth being confident in the decision, and having tried more conservative measures first, before booking. It's also not currently approved for use outside the knee, so it isn't an option for shoulder, hip, or hand osteoarthritis.
How does Arthrosamid compare with other knee osteoarthritis injections?
Cortisone injections work quickly but typically only last weeks to a few months, making them suited to short-term flare-ups. Hyaluronic acid injections aim to restore joint lubrication and generally last several months before needing to be repeated, which suits patients happy to have a routine top-up appointment. Arthrosamid sits further along that spectrum, offering an alternative for patients whose pain returns quickly after shorter-acting injections and who are looking for a more durable, if non-reversible, option before considering surgery. Around one in five adults over 45 in England live with knee osteoarthritis, so it's a decision many people eventually face, and there's rarely a single "correct" injection for everyone; the right choice depends on your knee, your goals, and how you've responded to treatment so far.
How do you find out if Arthrosamid is right for your knee?
The only way to know for certain is a proper clinical assessment. RAD Clinics offers ultrasound-guided knee assessments and Arthrosamid injections across our Milton Keynes, Northampton, and Aylesbury clinics, alongside the full range of knee pain treatment options if Arthrosamid isn't the right fit for you.
Every suitability consultation includes an ultrasound scan of the joint, so you leave with a clear picture of what's actually happening inside your knee, not just a decision based on symptoms alone. If you'd rather explore conservative options first, or want a second opinion on whether your knee has progressed to the point where Arthrosamid makes sense, book a physiotherapy assessment to talk through your history and get tailored advice on the best next step for your knee.
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