Low-Dose Radiation Explored for Knee Osteoarthritis Treatment

Researchers have begun examining the potential of low-dose radiation as a means to alleviate the painful symptoms associated with knee osteoarthritis.

This study, presented by South Korean scientists at the recent American Society of Radiation Oncology (ASTRO) meeting in September, indicates that a single radiation dose could be a “safe and effective” option for treatment.

Knee osteoarthritis, a degenerative joint condition, leads to pain, swelling, and stiffness in the knee, worsening over time.

The randomized clinical trial included 114 patients suffering from moderate to mild knee osteoarthritis. Participants were divided into groups receiving very low doses of radiation, low doses, or a placebo.

Throughout the study, the only pain relief medication administered was acetaminophen.

Each participant underwent six treatment sessions, and researchers evaluated “meaningful improvement” based on at least two of these criteria: pain, physical function, and overall condition assessment.

Patients also filled out questionnaires regarding their pain, stiffness, and functionality. Interestingly, no treatment-related side effects were reported in any of the cases.

After four months, 70% of those in the low-dose radiation group showed significant improvement according to the criteria, whereas only 42% of those given a placebo reported similar results. The very low dose group experienced an improvement of 58.3%.

The researchers noted that the findings indicate the low-dose treatment results in symptom alleviation that surpasses the placebo effect.

In the low-dose cohort, 56.8% reported substantial enhancements in pain relief, stiffness reduction, and physical function, compared to 30.6% in the placebo group.

The study concluded that low doses of radiation led to a marked reduction in pain and better functional outcomes over four months. However, it emphasized that the doses used in the trial were merely a “small fraction” of those ordinarily utilized in cancer therapies.

Dr. Byung-Hyuk Kim, who led the trial and is an assistant professor of radiation oncology at the Seoul National University School of Medicine’s Boramae Medical Center, explained that people suffering from painful knee osteoarthritis often grapple with the dilemma of choosing between painkiller side effects and potential joint replacement surgery complications.

He stated, “We think there’s a need for a middle ground between mild pain medications and more invasive surgeries. Radiotherapy could be an appropriate option, particularly when medications or injections aren’t well-tolerated.”

Dr. Kim suggested that radiation therapy might be especially beneficial for patients who still have some joint structure and are battling underlying inflammation.

He added, “In cases of severe osteoarthritis, where joint damage is extensive and cartilage is absent, radiation won’t regenerate tissue. Yet, for those with mild to moderate conditions, this technique could postpone the necessity for joint replacement surgery.”

This treatment should also be viewed in the context of other lifestyle adjustments, such as weight management. Kim emphasized that combining physical and drug therapies with radiation might yield even better results.

“Patient satisfaction could surpass that of existing treatments alone,” he noted.

However, the researchers pointed out various limitations within the study, including a relatively brief follow-up period.

Future plans for a larger trial are underway to compare low-dose radiation with standard drug treatments and assess outcomes among specific patient demographics.