Introduction

Osteoarthritis (OA) is a widespread joint condition that often causes knee pain and limits mobility. One particular type, patellofemoral osteoarthritis, affects the kneecap area and can be especially troublesome. People with this condition commonly experience discomfort during everyday activities such as climbing stairs, walking uphill, sitting for long periods, squatting, or cycling. Recently, Arthrosamid has been introduced as a new type of injectable treatment designed to add cushioning within the knee joint. This promising treatment offers fresh hope for those with localised kneecap OA by potentially improving comfort and movement.

Understanding Patellofemoral (Kneecap) Osteoarthritis

Patellofemoral osteoarthritis is a form of knee OA that affects the joint where the kneecap (patella) meets the thigh bone (femur). This differs from other knee OA types, which often involve the main knee compartments on either side of the kneecap. The causes are varied, including repetitive strain from activities like running or jumping, previous injuries, natural ageing, and mechanical alignment issues. A recent study highlighted that age is strongly linked to the severity of knee OA, noting a significant positive correlation between older age and worsening disease (Yang et al., 2024). Other structural factors around the kneecap also relate closely to OA severity. Symptoms typically include sharp or aching pain when bending or bearing weight on the knee, especially during stair climbing, hill walking, squatting or sitting for long periods, all of which can severely impact daily life.

Arthrosamid—A New Approach to Joint Cushioning

Arthrosamid is an innovative treatment delivered as a hydrogel injectable that supplements the natural cushioning inside the knee. This soft gel helps to reduce friction and spread pressure more evenly beneath the kneecap, easing discomfort during movement. The idea of “joint cushioning” is to protect sensitive areas and reduce pain during activities such as cycling, stair climbing, and prolonged sitting. Research confirms that “the intra-articular polyacrylamide hydrogel (PAAG) injection branded Arthrosamid® has been known to be safe and efficacious in knee osteoarthritis patients” over a 24-month follow-up (Gao et al., 2025a). Unlike traditional treatments such as painkillers, physiotherapy or hyaluronic acid injections, Arthrosamid focuses on supporting the knee mechanically rather than just addressing pain or inflammation. This reflects a move towards treatments that rebuild or support joint structure in osteoarthritis care.

Who Might Benefit Most from Arthrosamid?

Arthrosamid offers particular promise for patients experiencing targeted pain beneath the kneecap along with functional limitations. It is especially suited to those whose discomfort worsens with activities involving bending and load-bearing on the kneecap – such as climbing stairs, walking uphill, squatting, or cycling. Although more research is needed, current findings indicate that identifying which patients benefit most remains an area of active study. As one recent study puts it, “which patients would incur the most benefit from Arthrosamid is limited,” but ongoing work aims “to identify which patient factors would allow Arthrosamid to provide the most clinical benefit” (Gao et al., 2025a). Importantly, treatment suitability should always be assessed individually with healthcare professionals weighing potential benefits and risks to tailor the best approach.

Expert Care with Professor Paul Lee and MSK Doctors

Professor Paul Lee is a leading figure in cartilage health and knee osteoarthritis management. He holds roles such as Cartilage Expert, Regional Surgical Ambassador, and Advisor to the Royal College of Surgeons of Edinburgh. His clinical expertise extends to cartilage repair and rehabilitation, making him well placed to offer guidance on advanced treatments like Arthrosamid. MSK Doctors provides a comprehensive, patient-centred service where individuals receive expert assessment, personalised advice, and support throughout their treatment journey. Consulting seasoned specialists like Professor Lee can help patients understand their options clearly and choose treatments best suited to their needs.

Looking Ahead: Responsible Advice

While Arthrosamid is an exciting new option for managing patellofemoral osteoarthritis, it’s essential to consider all information carefully and consult a qualified healthcare professional before deciding on treatment. This article has explored the impact of kneecap OA, how Arthrosamid works as a cushioning treatment, and the expert care available through specialists like Professor Lee and MSK Doctors. For those struggling with localised kneecap OA pain, exploring these innovative therapies under professional guidance may improve comfort and function. However, every condition is unique, so personalised medical advice remains crucial. For individual medical guidance, please consult a qualified healthcare professional.