Introduction

Knee osteoarthritis (OA) is a widespread, degenerative joint condition where the cartilage cushioning the knee gradually wears away. This leads to pain, stiffness and restricted movement, which can severely impact everyday life. For many, managing symptoms often means balancing medications, physiotherapy, or even facing surgery. Recently, Arthrosamid injections have gained attention as a non-surgical treatment that offers cushioning inside the joint. But how well do these injections work in the long run? This article explores the clinical research and patient stories behind Arthrosamid’s lasting benefits.

What is Arthrosamid and How Does It Work?

Arthrosamid is an injectable gel made from 2.5% crosslinked polyacrylamide. When injected into the knee, it forms a soft, scaffold-like cushion that sticks to the lining of the joint, helping to restore the natural lubrication and cushioning lost through osteoarthritis. As Cole and colleagues explain, “It adheres to and bulks up the synovial membrane and acts as a scaffold to treat the synovium.” Importantly, while the chemical acrylamide can be neurotoxic, research by Walmod et al. shows that the gel itself “had no statistically significant effects on cell survival, non-apoptotic and apoptotic cell death, or the neurite network area,” supporting its safety on a cellular level. Unlike some treatments that gradually disappear from the joint, Arthrosamid remains in place, potentially providing ongoing support and pain relief.

How Do We Measure Success?

Doctors and researchers use standardised tools to track how well treatments like Arthrosamid work. The most common is the WOMAC index, which asks patients about their pain, stiffness, and ability to perform daily activities—scoring from 0 (no symptoms) to 100 (worst symptoms). Alongside this, pain levels are often measured with a Visual Analogue Scale (VAS), and some tests look at joint movement and overall patient wellbeing. Together, these measures help build a clear picture of how much difference a treatment makes to someone’s quality of life.

What Does the Evidence Say? Arthrosamid Over Time

Results After One Year

Studies show that many patients experience significant relief in the first year following Arthrosamid injection. Cole et al. reported “statistically significant data ... at both 52 weeks and 13 months,” highlighting reduced pain and improved function. A recent study by Aykaç and colleagues found that pain scores (VAS) dropped sharply three months after treatment in patients receiving Arthrosamid, “dropping to 3 ... By 12 months, VAS returned to baseline in hyaluronic acid and steroid groups, while iPAAG [Arthrosamid] remained slightly improved.” These findings suggest that Arthrosamid can provide meaningful, sustained pain relief over a year.

Benefits at Two and Three Years

Longer-term studies are promising as well. Cole’s review notes that benefits lasted “at 2 years,” with many patients maintaining improvements in pain and function without needing further injections. The treatment’s durable cushioning effect appears to stand the test of time, with few safety concerns reported.

Up to Five Years

While research beyond three years is still emerging, some early data indicates that relief might last as long as five years for some patients. This offers hope for those looking to delay or avoid knee replacement surgery. However, outcomes vary widely depending on factors such as age, weight and the severity of osteoarthritis.

How Does Arthrosamid Compare to Other Treatments?

Aykaç et al. compared Arthrosamid with hyaluronic acid and corticosteroid injections. They found that Arthrosamid “outperformed Steroid at 6 months” but showed similar results to hyaluronic acid. At 12 months, differences between treatments were less clear, though “iPAAG showed the highest patient acceptable symptom state rates” across 3, 6 and 12 months. Overall, Arthrosamid appears to offer comparable short-term benefits, with a modest edge at six months, making it a useful addition to personalised osteoarthritis care plans.

What Do Patients Say?

Patient stories often highlight a swift reduction in pain and improved ability to do daily tasks like walking or climbing stairs. Many report better sleep as pain eases, contributing to an improved quality of life. However, individual experiences vary, with some achieving lasting relief and others noting only short-term or partial improvements. These differences highlight the importance of managing expectations and tailoring treatment to each person’s unique situation.

Setting Realistic Expectations and Looking Forward

The current evidence suggests Arthrosamid is a promising option for those seeking a non-surgical way to manage knee OA pain with benefits that can last years. Success is more likely in younger patients with moderate OA and healthy weight. While repeat injections are not common practice yet, they might be considered if symptoms return. As always, it’s essential for patients to consult their healthcare providers to weigh options, discuss likely outcomes, and design a treatment plan best suited to their needs. Regular follow-up is key to adjusting care and maintaining joint health over time.

References

• Cole, A., Maulana, R., Whitehead, J., & Lee, P. (2022). A systematic review of the novel compound Arthrosamid polyacrylamide (PAAG) hydrogel for treatment of knee osteoarthritis. Medical Research Archives, 10(8). https://doi.org/10.18103/mra.v10i8.2950
• Aykaç, B., Dinç, M., Nar, Ö. O., Karasu, R., & Bayrak, H. Ç. (2025). Comparative efficacy of polyacrylamide hydrogel versus hyaluronic acid and corticosteroids in knee osteoarthritis: A retrospective cohort study. Medicine, 104(17). https://doi.org/10.1097/MD.0000000000044655
• Walmod, P. S., Kusk, P., Jøhnk, N., Ankorina‐Stark, I., & Essex, A. (2025). An injectable 2.5% cross-linked polyacrylamide hydrogel (2.5 iPAAG) demonstrates no neurotoxicity in human induced pluripotent stem cells-derived iCell® GlutaNeurons. Frontiers in Toxicology, 7, Article 1585430. https://doi.org/10.3389/ftox.2025.1585430

This overview combines the latest research and real-world insights to help patients and clinicians make informed choices about Arthrosamid injections as a long-term strategy for managing knee osteoarthritis.