LDRT Education & Awareness
Understanding Low-Dose Radiation Therapy for Osteoarthritis
What LDRT is, the benefits it may offer, what the evidence shows, and where to find treatment near you.
Learn LDRT FAQ Am I a Candidate Find a Location
What LDRT is, the benefits it may offer, what the evidence shows, and where to find treatment near you.
Learn LDRT FAQ Am I a Candidate Find a LocationA non-surgical, outpatient treatment for osteoarthritis, the most common form of arthritis. A radiation oncologist delivers a small, targeted dose to the joint, with no anesthesia or hospital stay required.
Osteoarthritis involves ongoing inflammation in the joint. Low-dose radiation seems to calm that inflammation by reducing activity in local immune cells, rather than repairing damaged cartilage. Total dose is about 3 Gy, far lower than cancer treatment doses.
Used for decades in parts of Europe, and now offered by a growing number of US radiation oncology programs, typically over about 6 short visits across 2-3 weeks.
The most commonly reported benefit across studies is meaningful pain relief in the treated joint.
As inflammation eases, many patients report being able to move the joint more freely.
Less pain and better movement together tend to translate into an easier daily routine.
Please consult your doctor if this sounds like you.
You've been diagnosed with osteoarthritis or degenerative joint disease, with pain in your knees, hips, hands, ankles, elbows, or shoulders.
Medications, injections, or physical therapy haven't fully helped, and you want to try something else before considering surgery.
You're not ready for joint replacement surgery, can't undergo it, or you're simply looking for a non-surgical outpatient option first.
"Radiation is only used to treat cancer."
Radiation oncologists also use much lower doses to treat certain non-cancer conditions, including osteoarthritis, a practice with decades of use outside the US.
"Any dose of radiation carries the same cancer risk."
The dose for osteoarthritis is about 3 Gy. Many cancer treatments use 40 Gy or more, a 10- to 20-fold difference. Long-term data hasn't shown a clear increase in cancer risk, though studies aren't yet large enough to rule out a very small risk.
"This is a fringe, unstudied treatment."
In 2026, the American Radium Society published Appropriate Use Criteria for LDRT in osteoarthritis. Across the studies they reviewed, response rates ranged from roughly 60% to 90%.
See our full research summary for sources.
A radiation oncologist reviews your condition and history to see if LDRT is a good fit.
A CT scan maps the exact treatment area, taken in the same position you'll be in for treatment.
The care team plans the exact dose using the CT images, to treat the joint precisely and limit exposure elsewhere.
Sessions are typically spread over 2-3 weeks. Each visit is brief, with no anesthesia or hospital stay required.
Your care team checks in to assess pain and function, and discusses whether a second course may help.
A 2026 guideline from radiation oncologists, rheumatologists, orthopedic surgeons, and a patient advocate. It concludes LDRT is appropriate for selected patients.
Read our summary →Randomized trials and real-world studies on how LDRT works, how well it works, and how safe it is.
See the research →Reported side effects are generally mild, but LDRT isn't right for every patient or every joint. Here's what's worth discussing with your radiation oncologist.
Review safety and limits →Primary care doctors, orthopedists, and rheumatologists often manage joint pain. Radiation oncologists deliver radiation. Because these groups work in different departments, LDRT often never comes up at a regular appointment.
LDRT isn't a patented drug or device, so there's no pharmaceutical marketing budget promoting it to patients or doctors the way a new medication would be advertised.
Low-dose radiation therapy has been used for decades in Europe. It's only more recently spread to a growing number of US radiation oncology programs, without the public awareness campaigns that come with new drugs.
Medical content on this site is reviewed for accuracy by our Medical Advisory Board of board-certified radiation oncologists.
What this site does not do: Radiant Joint Alliance does not diagnose arthritis, recommend a specific treatment, arrange referrals, or receive payment from locations listed in the directory. This site is meant to help patients prepare for informed conversations with their healthcare team.