Introduction

Knee osteoarthritis (OA) is a common, persistent condition impacting millions worldwide. Traditionally, one of the primary ways to ease pain and improve joint movement has been through injections of hyaluronic acid (HA), a substance naturally found in joint fluid that helps lubricate and cushion the knee. While hyaluronic acid injections can offer relief from discomfort, their effects tend to be short-lived, often lasting just a few months and leaving many patients searching for longer-lasting options.

Recognizing this gap in treatment, new therapies are emerging with the goal of delivering prolonged relief. One significant innovation is Arthrosamid , a gel made from polyacrylamide hydrogel —a material quite different from hyaluronic acid. Professor Paul Lee of the London Cartilage Clinic has been at the forefront of bringing these new possibilities to patients, drawing from the latest clinical evidence. In this article, we'll explore how Arthrosamid works, how it compares to hyaluronic acid , and what it could mean for people hoping for longer-term improvement in osteoarthritis symptoms.

What Makes Arthrosamid Different from Hyaluronic Acid?

Hyaluronic acid is a naturally occurring substance in joint fluid . When injected into an osteoarthritic knee, it can temporarily boost lubrication and cushioning, making movement easier and reducing pain. However, the body breaks down hyaluronic acid fairly quickly—meaning its benefits typically fade within a few months.

While some studies have shown pain and function improvements for up to a year after HA injections, most agree that these effects are not permanent, and the quality of evidence varies.

Arthrosamid works differently. It's made from polyacrylamide hydrogel , a synthetic, biocompatible material designed to adhere to the knee’s synovial membrane and form a supportive “scaffold” within the joint. This gentle support cushions the knee over a much longer period, reducing pressure on worn cartilage. Unlike hyaluronic acid , Arthrosamid isn’t broken down by the body, which means it can deliver relief that lasts significantly longer.

Additionally, studies suggest Arthrosamid tends to cause fewer short-term inflammatory reactions (such as post-injection irritation ) compared to HA, thanks to its stable and inert nature. In clinical research, it has consistently demonstrated a strong safety profile and lasting effectiveness in knee osteoarthritis , making it an appealing alternative when short-lived relief just isn’t enough.

Clinical Efficacy and Safety: More Than Just Short-Term Relief

Both hyaluronic acid and Arthrosamid have been found to reduce pain and improve mobility in people with knee osteoarthritis . However, the biggest difference between the two is how long their benefits can last. While HA injections generally help for six to twelve months, Arthrosamid ’s effects have been reported to persist for one to two years—or even longer in some patients.

Research also indicates that Arthrosamid is well tolerated, with most side effects limited to mild and temporary soreness at the injection site. Because the hydrogel remains stable within the joint, the risk of significant or ongoing inflammation appears to be low.

It’s important to remember that everyone responds to treatment differently. Factors such as the severity of osteoarthritis and individual patient health can influence results. Ongoing studies are working to identify which patients may benefit the most from Arthrosamid and how best to incorporate it alongside other therapies.

How Arthrosamid Can Improve Quality of Life

Knee osteoarthritis can make even simple daily activities challenging, often limiting independence and overall enjoyment of life. Treatments that go beyond short-term relief can help people stay active and engaged with the things they love.

Patients who have received Arthrosamid often report greater comfort and easier movement compared to their previous experiences with hyaluronic acid injections . Fewer injections are needed over time, meaning less hassle and fewer trips to the clinic. This reduction in repeat procedures is especially valuable for those seeking stability and consistency in symptom management.

With osteoarthritis being a chronic condition, having access to a treatment that offers long-lasting symptom control can make a profound difference—helping individuals maintain their quality of life, mobility, and independence for longer.

Expert Care at London Cartilage Clinic

At the London Cartilage Clinic, patients are welcomed into a caring environment where advanced, evidence-based treatments for osteoarthritis are provided. Professor Paul Lee and his experienced team take pride in delivering personalized care, developing treatment plans that match each individual’s unique needs and lifestyle.

Patients receive clear information and honest guidance about their options, allowing them to make informed choices without pressure or unrealistic expectations. The clinic’s approach combines medical innovation with ethical, patient-centered care—ensuring that new therapies like Arthrosamid are offered safely and thoughtfully.

Conclusion and Disclaimer

Osteoarthritis care is entering a new era, with innovative solutions like Arthrosamid providing hope for longer-lasting relief beyond conventional hyaluronic acid injections . By cushioning the joint more durably and showing a gentle safety profile, Arthrosamid represents a promising step forward in managing this widespread condition.

If you or someone you care about is struggling with knee osteoarthritis , consult a qualified healthcare professional to explore which treatment options might be best for you.

For individual medical advice, please speak to a qualified healthcare professional.

References

• Abate, M., Pelotti, P., De Amicis, D., Di Iorio, A., Galletti, S., & Salini, V. (2008). Viscosupplementation with Hyaluronic Acid in Hip Osteoarthritis (a review). Upsala Journal of Medical Sciences, 113(3), 261-278. https://doi.org/10.3109/2000-1967-233
• Gao, H. C. K., Akhtar, M., Creedon, C., Nar, Ö. O., & Lee, P. Y. (2025). THE IMPACT OF PATIENT FACTORS ON THE MINIMAL CLINICALLY IMPORTANT DIFFERENCE OF ARTHROSAMID POLYACRYLAMIDE HYDROGEL INJECTION FOR KNEE OSTEOARTHRITIS: A COHORT STUDY. Osteoarthritis and Cartilage. https://doi.org/10.1016/j.joca.2025.02.648
• Strauss, E. J., Hart, J., Miller, M. D., Altman, R. D., & Rosen, J. (2009). Hyaluronic Acid Viscosupplementation and Osteoarthritis. The American Journal of Sports Medicine, 37(8), 1636-1644. https://doi.org/10.1177/0363546508326984