From cityofhope.org
Arizona arthritis rates are higher than those nationally. Find out whether low-dose radiation therapy may help ease osteoarthritis symptoms.
Arthritis is a common condition, affecting more than 60 million people across the United States. In Arizona, the arthritis rates are higher than the national average: Approximately 30% of women and 21% of men have some form of the disease. One possible reason for this is that individuals with arthritis often move to warmer, dryer climates, like Arizona, in search of symptom relief.
Osteoarthritis treatment typically begins with conservative approaches such as physical rehabilitation, weight loss and moderate levels of physical activity. These are frequently followed by the use of nonsteroidal anti-inflammatory drugs (NSAIDs). However, these initial strategies may not provide sufficient symptom relief — or their effectiveness may diminish over time.
One evidence-based treatment option has been shown to reduce pain and improve joint function in people with osteoarthritis: Low-dose radiation therapy (LDRT).
“LDRT works by reducing joint inflammation, resulting in decreased pain, improved mobility and enhanced quality of life,” explains Michael Christensen, M.D., M.B.A., radiation oncologist at City of Hope® Cancer Center Phoenix. “This is especially true in patients who have not responded well to conventional therapies like NSAIDs, physical therapy or weight loss.”
Arthritis is more common in Arizona than in most other states – and it can significantly impact patients’ daily lives.
- More than 23% of Arizonans, or approximately 1.6 million people, have been diagnosed with arthritis
- About 850,000 Arizonans experience daily limitations due to their arthritis
- Approximately 42% of those with arthritis report work-related limitations caused by the condition
What Is Low-Dose Radiation Therapy for Osteoarthritis?
While radiation therapy is commonly associated with cancer treatment, it has been used for decades to treat a wide range of non-cancerous condition as well. As the name suggests, LDRT involves significantly lower doses of radiation than those used in cancer care. When used to treat osteoarthritis, LDRT can target the joints most affected by the disease.
“Low-dose radiation therapy helps relieve pain and inflammation in osteoarthritis by modulating the body’s immune response,” says Dr. Christensen.
LDRT may help relieve arthritis symptoms — such as joint pain and reduced mobility — through several biological mechanisms:
- Reducing the activity of inflammatory cells, including macrophages and neutrophils
- Slowing down the production of pro-inflammatory proteins
- Enhancing the immune system’s ability to control inflammation and preserve healthy joint tissue
Dr. Christensen notes that approximately 70% of patients experience meaningful symptom relief, with the greatest improvement typically occurring between six and 12 weeks after treatment.
How Is LDRT Administered?
LDRT is delivered externally using focused radiation beams. The process is non-invasive and pain free, with each course typically consisting of six sessions over two to three weeks.
“LDRT is an outpatient treatment, where each session lasts just 10 to 15 minutes,” says Dr. Christensen. “Because it’s so well tolerated, most patients can resume normal activities immediately after each treatment.”
If a patient experiences partial relief or symptoms return, a second course of LDRT may be considered eight to 12 weeks after the initial treatment.
Low-Dose Radiation Therapy Side Effects
One of the key benefits of LDRT for osteoarthritis is its low risk of side effects.
“The radiation doses used for LDRT are much lower than the threshold associated with tissue damage or secondary malignancy,” Dr. Christensen explains.
Side effects are rare and generally mild, with the most commonly reported being temporary skin redness or mild fatigue. Importantly, there is no evidence that LDRT increases the risk of cancer in older adults.
https://www.cityofhope.org/locations/phoenix/low-dose-radiation-therapy-for-osteoarthritis





