Functional Gains After PAAG Injections in Knee Osteoarthritis: Insights from Oxford Knee and Lysholm Scores

Introduction

Knee osteoarthritis (OA) is a widespread condition that causes pain , stiffness, and limited mobility, making everyday tasks difficult for many people. Recently, polyacrylamide hydrogel (PAAG) injections have emerged as a promising, minimally invasive option to relieve symptoms and help patients move more freely. In this article, we’ll explain how PAAG injections can improve life for people with knee OA, focusing on two respected assessment tools: the Oxford Knee Score (OKS) and the Lysholm score. We’ll also discuss how improvements on these scales translate to real-world activities like climbing stairs and walking, and highlight which patients are most likely to benefit.

Understanding Knee Osteoarthritis and PAAG Treatment

Knee osteoarthritis affects millions around the globe and tends to progress over time, making movement increasingly challenging. Available treatments range from simple lifestyle changes and pain medications to more invasive procedures like knee replacement surgery . PAAG injections offer a valuable middle ground—they’re a minimally invasive treatment designed to reduce pain and improve joint function. Recent research has shown that PAAG injections can provide relief from knee OA symptoms for up to two years, helping many people put off or even avoid surgery while improving their daily comfort and mobility.

How Do We Measure Improvement? The Oxford Knee and Lysholm Scores

To truly understand whether PAAG injections are effective, doctors turn to patient-reported questionnaires that capture how individuals feel and function in daily life. The Oxford Knee Score (OKS) assesses pain and the knee’s performance in activities like walking and climbing stairs. The Lysholm score looks more closely at knee stability and tasks such as squatting or going up and down stairs. Both tools use a concept called the minimal clinically important difference (MCID), which reflects the smallest change in score that patients actually notice and value in their day-to-day life. By tracking OKS and Lysholm scores over time, clinicians can tell whether patients are experiencing meaningful improvements, not just changes on paper.

Who Benefits Most? Key Patient Factors

PAAG injections aren’t a one-size-fits-all solution—results can vary widely. According to recent studies, certain patient characteristics predict a better chance of significant improvement. Older adults, those with less severe osteoarthritis , people without diabetes, and individuals with OA in both knees are more likely to achieve noticeable benefits on both the OKS and Lysholm scores. Interestingly, patients who receive injections in just one knee often see greater gains in knee stability than those treated in both knees at once. Additionally, those who start with better knee function before treatment tend to progress more after PAAG injections.

What Do These Improvements Mean for Daily Life?

Rising OKS and Lysholm scores reflect more than clinical progress—they also signal real, everyday gains. For many with knee OA , activities like climbing stairs, walking outdoors, or handling household chores can be daunting. Meaningful improvements in these scores suggest patients are regaining the ability to tackle these tasks with less pain and greater confidence. In short, better scores usually mean people aren’t just feeling less pain; they’re reclaiming independence and returning to the activities that matter most.

Conclusion and Looking Ahead

PAAG injections are proving to be a promising option for people with knee osteoarthritis , leading to real improvements in pain relief, mobility, and quality of life as measured by the Oxford Knee and Lysholm scores. However, the best outcomes are seen when patients are carefully selected based on factors like age, diabetes status, OA severity, and whether one or both knees are treated. While early results are encouraging, more research is needed to confirm these benefits, fine-tune patient selection, and understand the long-term effects of PAAG treatment . As our understanding grows, PAAG injections could become an important tool in helping people with knee OA stay active and enjoy life more fully.

References

Gao, H. C. K., Akhtar, M., Creedon, C., Nar, Ö. O., Verma, T., & Lee, P. Y. F. (2025). Polyacrylamide hydrogel injections in knee osteoarthritis: A PROMs-based 24 month cohort study. Journal of Clinical Orthopaedics and Trauma. https://doi.org/10.1016/j.jcot.2025.103136