Low-dose radiotherapy may offer a long-term treatment option for patients with early-stage knee osteoarthritis. According to a 12-year follow-up study presented at the American Society for Radiation Oncology (ASTRO) Annual Meeting in Boston, participants receiving the treatment experienced sustained improvements in pain, physical function, and quality of life. The data also revealed a 67% lower risk of government-certified disability compared to those treated with medication alone.
Tracking disease progression over twelve years
The study analyzed data from a randomized trial involving 292 patients with an average age of 38. Researchers utilized the Kellgren-Lawrence scale to classify participants between grade 0 and 2, confirming early-stage disease rather than advanced joint degeneration. They tracked these individuals for nearly 12 years to assess how their osteoarthritis progressed.
Structural benefits observed in clinical imaging
Bobby (Nagendra) Koneru, a radiation oncologist at Loyola University in Maywood, noted that the results demonstrate a unique integration of clinical and structural benefits. Magnetic resonance imaging (MRI) scans revealed significantly less structural deterioration within the knee joint compared to the control group. The most pronounced benefits were observed in patients with grade 2 osteoarthritis, who also required fewer knee replacement surgeries over the follow-up period.
Modulating inflammation without cell destruction
Unlike the high-dose radiation protocols used in oncology to destroy malignant cells or inhibit their growth, the doses used in this study were significantly lower. Koneru explained that the objective of this approach is not to eliminate cells but to modulate the inflammatory environment within the joint.
While low-dose radiotherapy has been used across Europe for decades to manage non-cancerous inflammatory conditions, its application in the United States has historically focused on pain relief. These findings suggest the treatment may have a disease-modifying effect. Standard management—typically centering on weight management, exercise, and symptom-focused injections or medications—often fails to halt the structural progression of the disease.
The path toward broader clinical validation
While the results of this long-term follow-up are promising, researchers emphasize the need for further validation. The study’s authors indicate that a larger, multicenter trial is necessary to definitively confirm whether low-dose radiotherapy can be classified as a disease-modifying treatment for early-stage knee osteoarthritis. By establishing this in a broader population, the medical community aims to determine if this therapy can consistently alter the long-term clinical trajectory of the condition for younger patients.