08 Feb 2026
Arthrosamid Injections for Knee Osteoarthritis: Safety and Long-Term Benefits
Introduction
Arthrosamid is fast becoming a popular injectable treatment for people living with knee osteoarthritis (OA). Made from a unique polyacrylamide hydrogel, this treatment offers a fresh approach to easing joint pain and boosting mobility. Naturally, both patients and healthcare professionals want to know about its long-term safety, how well it lasts, and any risks involved. In this article, we’ll explain what current research reveals about Arthrosamid’s safety, effectiveness over time, typical side effects, and who might benefit most from this treatment.
What Is Arthrosamid and How Does It Work?
Arthrosamid is a gel-like substance injected directly into the knee joint. Its special hydrogel acts as a cushioning scaffold that integrates with the joint’s lining, improving lubrication and elasticity. This helps reduce pain and allows smoother movement. Unlike steroid injections that primarily reduce inflammation, or traditional hyaluronic acid treatments that replenish joint fluid, Arthrosamid provides a firm, long-lasting support inside the joint.
Hydrogels like Arthrosamid have a long history in medicine. As one recent review notes, "Hydrogels have been used in the clinic since the late 1980s with broad applications in drug delivery, cosmetics, tissue regeneration, among many other areas" (Clegg et al., 2024).
Experts such as Professor Paul Lee, alongside the team at MSK Doctors, carefully administer Arthrosamid injections using ultrasound guidance to ensure accuracy and safety, tailoring care to each patient’s needs.
How Safe Are Arthrosamid Injections? What Side Effects Can You Expect?
Clinical studies and experience show that Arthrosamid injections are generally very safe. Most patients experience only mild, short-lived side effects such as slight pain, swelling, or stiffness around the injection site, which usually ease within a few days. Serious complications like infections or prolonged inflammation are uncommon, especially when injections are done in sterile conditions and with expert oversight.
One study highlighted that "Single injections of 6 ml intra-articular iPAAG are well tolerated," confirming its good safety record (Bliddal et al., 2023). Advances in hydrogel technology have also improved safety, with researchers noting "rapid advances... in polymer chemistry, crosslinking approaches, and hydrogel fabrication methods" over recent decades (Clegg et al., 2024).
Patients will receive thorough monitoring before, during, and after treatment to catch any signs of side effects early. Compared to corticosteroid injections, which sometimes carry risks like accelerated joint damage, Arthrosamid’s biocompatible gel minimises such dangers and is considered a safer alternative for appropriate patients.
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What Do We Know About Arthrosamid’s Long-Term Results and Repeat Use?
Studies indicate that Arthrosamid provides effective and lasting relief — often extending well beyond 12 months. For some, the benefits may continue for up to two years. Supporting this, a three-year clinical study reported “clinically relevant and statistically significant effectiveness at 3 years after treatment” (Bliddal et al., 2023). This included improvements in pain, stiffness, and physical function, all key factors in managing OA symptoms.
More recent research compared Arthrosamid with other common knee injections and found that "iPAAG outperformed Steroid at 6 months" with sustained improvements that “remained stable” even after 12 months, unlike hyaluronic acid and steroid treatments which tended to return to baseline (Aykaç et al., 2025).
This longer-lasting effect is largely thanks to the hydrogel’s non-biodegradable nature, which helps maintain cushioning within the joint over time. For some patients, repeat injections may be necessary to keep symptoms at bay, and such treatments have been found safe when conducted by experienced clinicians.
The team at MSK Doctors offers ongoing follow-up care to monitor each patient’s progress and adjust treatment plans as needed for the best possible outcome.
Who Can Benefit Most from Arthrosamid? Patient Suitability
Arthrosamid is best suited to people with mild to moderate knee OA who haven’t found enough relief through conventional treatments like physiotherapy or painkillers. Factors affecting suitability include the severity of the arthritis, previous treatments, and overall health.
It may not be recommended for those with very advanced joint damage, active infections, or certain health conditions. A careful assessment by a healthcare professional is essential to ensure the treatment is appropriate and to set realistic expectations about the duration of benefits, potential side effects, and the need for follow-up visits or repeat injections.
Shared decision-making is key, enabling patients to weigh the benefits and limitations of Arthrosamid alongside their health goals.
Conclusion & Important Advice
Current evidence supports Arthrosamid as a safe and effective option for managing knee osteoarthritis, offering lasting pain relief and improved joint function with few side effects. Patients stand to gain most when treatment is provided by experienced specialists like Professor Paul Lee and the MSK Doctors team, who deliver precise injections and attentive aftercare.
If you’re considering Arthrosamid, be sure to consult a qualified healthcare professional for tailored advice. This article provides useful information but does not replace a personalised medical consultation.
References
- 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. Annals of the Rheumatic Diseases. https://doi.org/10.1136/annrheumdis-2023-eular.6038
- Clegg, J. R., Adebowale, K., Zhao, Z., & Mitragotri, S. (2024). Hydrogels in the clinic: An update. Bioengineering & Translational Medicine, 9(6). https://doi.org/10.1002/btm2.10680
- 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
Frequently Asked Questions
- Arthrosamid uses a unique hydrogel that integrates with the joint, offering lasting cushioning and support. At MSK Doctors, Professor Paul Lee’s expertise ensures precise, ultrasound-guided injections for tailored, patient-focused results distinct from traditional steroid or hyaluronic acid treatments.
- Arthrosamid is well tolerated with mostly mild, short-lived side effects, such as mild swelling or pain. With Professor Paul Lee and the MSK Doctors team’s expert techniques and monitoring, risks are minimised and thorough patient aftercare is maintained throughout the treatment process.
- Clinical studies indicate sustained benefits, often over 12 months and sometimes up to two years. The hydrogel’s lasting nature reduces the need for frequent repeats, and MSK Doctors provides ongoing follow-up to maximise results, with repeat injections considered safely if needed.
- Those with mild to moderate knee osteoarthritis, who have not responded to conventional treatments, often benefit most. Professor Paul Lee and MSK Doctors carefully assess patient suitability, considering joint condition and overall health before advising on the appropriateness of Arthrosamid.
- MSK Doctors, led by Professor Paul Lee—a recognised cartilage expert and surgical ambassador—offer advanced, individualised care. Their extensive clinical experience and precision in procedures provide patients with attentive support and optimal chances for positive outcomes with Arthrosamid treatment.
Legal & Medical Disclaimer
This article is written by an independent contributor and reflects their own views and experience, not necessarily those of Lincolnshire Knee. It is provided for general information and education only and does not constitute medical advice, diagnosis, or treatment.
Always seek personalised advice from a qualified healthcare professional before making decisions about your health. Lincolnshire Knee accepts no responsibility for errors, omissions, third-party content, or any loss, damage, or injury arising from reliance on this material.
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