Can Radiotherapy Help Knee Osteoarthritis? The Emerging Role of Low-Dose Radiotherapy in Rare, Carefully Selected Cases !

By Abhinav Singh, Pain And Rehab Physician

Can Radiation Therapy Be Used for Knee Osteoarthritis?

When people hear the term radiotherapy, they usually associate it with cancer treatment. However, for decades, low-dose radiotherapy (LDRT) has been used in selected European centers to treat certain benign musculoskeletal disorders, including painful osteoarthritis.

Although it is not a routine treatment, LDRT may have a role in carefully selected patients with knee osteoarthritis when conventional treatments have failed or are unsuitable.

What Is Low-Dose Radiotherapy?

Low-dose radiotherapy uses radiation doses that are significantly lower than those used in cancer treatment. The goal is not to destroy tissue, but to reduce chronic inflammation and alleviate pain.

Unlike knee replacement surgery, prolotherapy, or platelet-rich plasma (PRP), LDRT does not regenerate cartilage or reverse the structural changes of osteoarthritis. Its primary objective is pain relief.

How Does It Work?

Experimental studies suggest that low-dose radiation may:

  • Reduce inflammatory cytokines

  • Modulate macrophage activity

  • Decrease chronic synovial inflammation

  • Reduce pain signaling

  • Improve local tissue microcirculation

These anti-inflammatory effects may explain why some patients experience meaningful pain relief.

When Can It Be Considered?

Current evidence suggests that LDRT should be reserved for rare and carefully selected situations, such as:

  • Persistent symptomatic knee osteoarthritis despite optimal conservative treatment

  • Patients who cannot undergo knee replacement because of advanced age or severe medical comorbidities

  • Individuals who are medically unfit for surgery

  • Patients in whom repeated injections are contraindicated or have failed

  • Selected frail elderly patients where the primary goal is pain relief and maintaining mobility

Patient selection is critical, and decisions should involve a multidisciplinary team.

What Does the Evidence Show?

Several observational studies, particularly from Germany, have reported improvements in pain and function after LDRT. However, randomized controlled trials have produced mixed results.

Consequently, most international guidelines—including those from major rheumatology and orthopaedic organizations—do not currently recommend low-dose radiotherapy as a routine treatment for knee osteoarthritis.

The evidence remains promising but insufficient for widespread adoption.

Advantages

Potential benefits include:

  • Non-invasive treatment

  • Outpatient procedure

  • Minimal discomfort

  • Low complication rates

  • Possible reduction in chronic pain

  • Improved walking ability in selected patients

Limitations

Patients should understand that LDRT:

  • Does not repair damaged cartilage

  • Does not correct deformity

  • Does not improve muscle weakness

  • Does not replace rehabilitation

  • Is not a substitute for exercise therapy

  • Is not appropriate for every patient

Pain relief, when achieved, may take several weeks to develop.

Safety

The radiation doses used for benign conditions are much lower than those used in oncology.

Reported adverse effects are uncommon and generally mild. Nevertheless, radiation exposure should always follow the principle of using the lowest effective dose, particularly for non-malignant conditions.

Why Rehabilitation Remains Essential

Even when pain improves after radiotherapy, patients continue to require rehabilitation to address the mechanical contributors to osteoarthritis.

A comprehensive rehabilitation program should include:

  • Quadriceps strengthening

  • Hip muscle strengthening

  • Balance training

  • Gait retraining

  • Weight reduction

  • Orthoses when indicated

  • Lifestyle modification

  • Fall prevention strategies

Without rehabilitation, pain relief alone rarely translates into long-term functional improvement.

The Role of the Rehabilitation Physician

A Rehabilitation Physician evaluates whether pain arises primarily from inflammation, biomechanical abnormalities, muscle weakness, instability, or functional limitations.


Before considering uncommon interventions such as LDRT, a PMR specialist ensures that evidence-based conservative measures have been optimized. When appropriate, they coordinate multidisciplinary care with orthopaedic surgeons, rheumatologists, pain specialists, and radiation oncologists to individualize treatment.

Conclusion

Low-dose radiotherapy is not a first-line treatment for knee osteoarthritis. However, in rare, carefully selected patients—particularly those with persistent pain who are unsuitable for surgery—it may offer symptomatic relief.

Current evidence does not support its routine use, but it remains an area of ongoing research. Regardless of the treatment chosen, rehabilitation remains the cornerstone of osteoarthritis management, helping patients improve mobility, independence, and quality of life.

Key Take-Home Messages

  • Low-dose radiotherapy is different from cancer radiotherapy.

  • It may provide pain relief in carefully selected patients.

  • It does not regenerate cartilage or cure osteoarthritis.

  • It is not recommended routinely by current international guidelines.

  • Rehabilitation and exercise remain the foundation of treatment.

  • Decisions regarding LDRT should be individualized and made by a multidisciplinary team.

Dr. Abhinav Singh, MBBS, MD (PMR)
Pain & Rehabilitation Physician
Jeejeevisha Pain Clinic (JPC)
Kendriya Vidhyalaya Road, Kankarbagh, Patna

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