Knee osteoarthritis is a common condition that can cause pain, stiffness, and difficulty moving, impacting quality of life. As the cartilage in the knee wears away, everyday activities can become harder to manage. While surgery is an option for severe cases, many people look for less invasive treatments to ease their symptoms. Injectable therapies, like Arthrosamid and Hyaluronic Acid injections, have become popular alternatives. This article offers clear, evidence-based information to help you understand these options and make a confident, informed choice about your care. Remember, this is for educational purposes and does not replace personalised advice from your healthcare professional.

What Are Arthrosamid and Hyaluronic Acid Injections?

Arthrosamid and Hyaluronic Acid injections work in different ways to relieve knee osteoarthritis symptoms. Arthrosamid is a gel made from a polymer that doesn’t break down easily. When injected, it integrates into the lining of the joint, acting as a cushion that provides long-lasting pain relief. Recent studies highlight that “iPAAG fulfils an unmet clinical need for an effective, long-acting and safe non-surgical treatment that may postpone knee surgery for those with OA.”

Hyaluronic Acid, on the other hand, is a substance naturally found in your joints that lubricates and cushions the cartilage. Injections of Hyaluronic Acid top up this joint fluid, usually offering relief that lasts around six to twelve months.

Both treatments have been used successfully in managing osteoarthritis and have strong clinical support. Experts like Professor Paul Lee and the MSK Doctors team focus on providing clear, unbiased information to help patients understand their choices.

How Effective Are These Treatments and How Long Do They Last?

Arthrosamid typically provides much longer-lasting relief, often improving symptoms for two to three years or more. One study followed patients for three years and found that “single injections of 6 ml intra-articular iPAAG are well tolerated and continue to provide clinically relevant and statistically significant effectiveness at 3 years after treatment.”

Hyaluronic Acid injections generally offer relief for six to twelve months, meaning you might need repeat injections to maintain benefits.

A recent comparison found that “iPAAG offers comparable short-term efficacy and modest advantage at 6 months. However, long-term superiority is limited. It may be a complementary option in individualized osteoarthritis management,” with iPAAG showing stable results at 12 months while Hyaluronic Acid’s benefits tended to wane.

In simple terms, Arthrosamid acts as a steady cushion inside the joint, while Hyaluronic Acid supplements the natural joint fluid temporarily.

Both treatments have good safety records. For example, in a long-term study, “none of the new adverse events were assessed as related to treatment,” supporting Arthrosamid’s safety when administered by experienced clinicians.

Professor Paul Lee and the MSK Doctors team aim to use the latest research and clinical experience to guide treatment in a patient-centred way.

Who Might Benefit Most From Each Injection?

Choosing the right injection depends on your specific situation, including how advanced your osteoarthritis is, your age, lifestyle, and treatment goals.

Arthrosamid could be especially suitable if you have moderate osteoarthritis and are hoping for longer-lasting relief without frequent injections. It may also suit more active individuals aiming for sustained symptom control over several years.

Hyaluronic Acid injections might fit better if your osteoarthritis is mild to moderate or if you prefer a treatment with a long-standing safety profile and don’t mind regular injections. It is also an option if you want something easily reversible.

Ultimately, a tailored assessment by a specialist such as Professor Paul Lee or the MSK Doctors team is important to find the best match for your needs.

Why Specialist Consultation Matters

Deciding between Arthrosamid and Hyaluronic Acid is best done with the help of an orthopaedic or musculoskeletal specialist. At MSK Doctors, consultations involve open conversations about the pros and cons of each treatment. You will be supported to weigh clinical evidence alongside your personal preferences and health goals to reach a shared decision.

Your appointment will cover a full review of symptoms, potential imaging tests, and time for your questions. This personalised approach helps you feel confident and informed about managing your knee osteoarthritis.

Conclusion

Arthrosamid and Hyaluronic Acid injections each offer distinct benefits in treating knee osteoarthritis. Arthrosamid tends to provide longer-lasting relief with fewer injections, while Hyaluronic Acid offers a medium-term option with a strong safety record, though it may require more frequent treatment. Consulting knowledgeable clinicians like Professor Paul Lee and the MSK Doctors team is key to finding the most suitable and effective approach for you.

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

References

• Cole, A., Maulana, R. K., Whitehead, J. P., & Lee, P. Y. F. (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
• Bliddal, H., Beier, J., Hartkopp, A., Conaghan, P. G., & Henriksen, M. (2023). Polyacrylamide hydrogel for the treatment of knee osteoarthritis: 3 year follow up results of a prospective clinical study. Abstract presented at EULAR 2023. https://doi.org/10.1136/annrheumdis-2023-eular.6038
• 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(38), e44655. https://doi.org/10.1097/md.0000000000044655