New knee arthritis treatment delivers lasting pain relief without surgery

A minimally invasive procedure that targets abnormal blood vessels in the knee could provide lasting relief for people struggling with osteoarthritis, offering a potential alternative to joint replacement surgery.

In a study involving 194 patients, researchers found that a treatment using tiny particles that dissolve within hours was associated with substantial reductions in knee pain and improvements in mobility. The benefits persisted for at least 12 months, with 80% of patients assessed at the one-year follow-up reporting clinically meaningful pain relief.

The approach, known as genicular artery embolization, aims to interrupt the inflammation and abnormal blood vessel growth that contribute to chronic knee pain. Rather than replacing the damaged joint, doctors use a thin catheter to deliver microscopic particles directly into specific blood vessels.

The findings, published in the journal Radiology, suggest that this technique could provide another option for patients who have exhausted conventional treatments but cannot or do not want to undergo knee replacement surgery.

Osteoarthritis is the world's most common form of arthritis and a major cause of disability. According to the World Health Organization, knee osteoarthritis affects more than 365 million adults worldwide.

The condition develops as cartilage, the protective tissue that cushions the ends of bones, gradually deteriorates. But osteoarthritis involves more than cartilage damage. Inflammation within the joint, changes in surrounding tissues, and increased sensitivity of pain signaling nerves can all contribute to persistent discomfort.

For many people, the consequences extend far beyond occasional knee pain. Everyday activities such as walking, climbing stairs, exercising, or standing for extended periods can become increasingly difficult.

Treatments typically begin with physical therapy, medication, and injections into the affected joint. When these approaches stop providing adequate relief, knee replacement surgery may eventually be considered. However, surgery is not appropriate or desirable for everyone.

"For many patients with knee osteoarthritis, there is a real treatment gap today," said Florian Nima Fleckenstein, M.D., deputy head of Interventional Radiology Campus Mitte, Charité -- Universitätsmedizin Berlin. "Conservative measures such as intra-articular injections no longer provide sufficient relief, but joint replacement is not an option for medical or personal reasons."

The treatment being investigated, genicular artery embolization (GAE), approaches knee arthritis from an unusual direction. Instead of focusing directly on damaged cartilage, it targets the abnormal blood vessels that develop around an inflamed joint.

These vessels can form within and around the synovium, a thin membrane lining the inside of the joint. As the vessels multiply, they can contribute to inflammation and encourage the growth of sensory nerves involved in transmitting pain.

GAE is designed to interrupt this process by reducing blood flow through the abnormal vessels while preserving the knee's normal circulation.