Arthritis Radiotherapy
Low-Dose Radiation for Hand Osteoarthritis: Why Evidence Differs
Sham-controlled hand osteoarthritis trials did not show meaningful benefit from low-dose radiation, so positive knee findings should not be generalized.
Short answer: The best sham-controlled evidence for hand osteoarthritis has not shown a meaningful benefit from low-dose radiation. That does not invalidate every knee study, but it does mean results should be discussed joint by joint.
What did the hand trial test?
Fifty-six people aged 50 or older with painful hand osteoarthritis that had not responded to conservative care were randomized to:
- six treatments of 1 Gy over two weeks; or
- six identical sham sessions with no radiation.
Patients and outcome assessors were blinded. At three months, 29% of the radiation group and 36% of the sham group met the responder definition. Pain, function, quality of life, blood markers, and ultrasound inflammation also did not differ significantly.
Did benefit appear later?
Six- and 12-month follow-up still found no significant responder difference between radiation and sham. The result argues against a large delayed effect for that regimen and population.
Why does this seem different from knee research?
The positive 2025 Korean knee trial used a lower total dose of 3 Gy, selected Kellgren-Lawrence grade 2 to 3 knee disease, restricted pain medication, and measured a four-month response. The hand trial used 6 Gy and enrolled a different condition in a different joint.
Possible explanations include:
- different joint structure and pain mechanisms;
- dose and fraction size;
- disease phenotype or inflammatory activity;
- selection criteria;
- statistical uncertainty in small trials; and
- chance.
It is not scientifically sound to choose the preferred result and ignore the other.
What should a patient with hand pain do?
Hand pain may come from thumb-base osteoarthritis, finger-joint osteoarthritis, tendon disease, nerve compression, inflammatory arthritis, or another diagnosis. Evaluation should identify the source before any procedure.
Evidence-supported care may include activity modification, hand therapy, splints, topical medication, selected injections, or surgery depending on the joint and severity.
The practical conclusion
Current randomized evidence does not support promising low-dose radiation benefit for hand osteoarthritis. If it is discussed, the negative sham-controlled data and available alternatives should be explained explicitly. More research may identify a responsive subgroup, but that subgroup has not yet been established.
Questions patients often ask
Did low-dose radiation help hand arthritis in the randomized trial?
No significant benefit over sham was demonstrated for symptoms or measured inflammation.
Why might hand and knee results differ?
Joint biology, dose, disease severity, patient selection, endpoints, and trial methods can all differ.
Can the 2025 knee result be applied to hand pain?
No. It directly studied selected knee osteoarthritis patients, not hand osteoarthritis.
Sources and further reading
- Lack of beneficial effects of low-dose radiation therapy on hand osteoarthritis. Osteoarthritis and Cartilage (2018).
- Long-term efficacy in knee and hand osteoarthritis: sham-controlled trial follow-up. The Lancet Rheumatology (2020).
- Clinical Effectiveness of Low-Dose Radiation in Knee Osteoarthritis. ASTRO Annual Meeting (2025).
