Low-Dose Radiotherapy for Chronic Tendon Pain and Bursitis.

When Tendon and Bursal Pain Becomes Chronic

Tendon pain and bursitis are extremely common and often improve with time, activity modification, physiotherapy and other conservative treatments. For some people, however, symptoms persist for many months despite these measures and begin to interfere significantly with walking, exercise, work or everyday activities.

Conditions such as tennis elbow, golfer’s elbow, Achilles tendinopathy and greater trochanteric pain syndrome can involve a mixture of degenerative change and persistent inflammatory activity around the tendon, its attachment to bone and nearby bursae. Low-dose radiotherapy is thought to influence this inflammatory environment rather than repair a damaged tendon mechanically. Its potential role is therefore in selected patients with chronic symptoms, rather than as an early treatment for a recent tendon injury.

This distinction is important. A painful tendon with ongoing inflammatory activity is very different from a tendon that has completely ruptured, and radiotherapy would not be expected to restore structural damage such as a full-thickness tear.

What Does the Evidence Show?

The longest experience comes from Germany, where low-dose radiotherapy has been used for painful tendon and periarticular conditions for decades and is included within national guidance when simpler treatments have not provided lasting relief.

Some of the strongest data are for chronic painful elbow syndromes, including tennis and golfer’s elbow. In a prospective German study of 199 patients, approximately 80% had improved shortly after treatment, 90% by six weeks and 94% at long-term follow-up of around three years. These are encouraging results, although the study did not include a sham-treated control group.

There is also growing evidence for other sites. A recent study of 71 patients with Achilles tendinopathy involving 81 treated feet found that 79% responded, with a substantial reduction in pain among those with follow-up measurements. In greater trochanteric pain syndrome, which commonly involves gluteal tendinopathy and adjacent bursitis around the outer hip, a contemporary study found marked improvement or complete pain relief in 59% of treated areas. Outcomes were better in selected patients, reinforcing the importance of identifying the underlying source of pain rather than treating symptoms alone.

The evidence is less developed for conditions such as shoulder tendinopathy and bursitis, patellar tendinopathy and some other enthesopathies. This is why the treatment should not be applied broadly to every painful tendon. New multidisciplinary guidance from the American Radium Society recognises LDRT as a possible second-line treatment for selected chronic refractory periarticular conditions, while also emphasising that the quality of evidence remains limited and further prospective trials are needed.

Which Patients May Be Suitable?

Low-dose radiotherapy is generally considered only after a condition has become persistent and reasonable conservative measures have been tried. This may include physiotherapy, modification of aggravating activities, appropriate analgesia or anti-inflammatory treatment, and injections or other local therapies where clinically appropriate.

A clear diagnosis is particularly important. Pain around the outer hip, for example, may arise from gluteal tendinopathy or bursitis, but it can also be related to hip osteoarthritis or referred pain from the lumbar spine. Similarly, heel pain may arise from the Achilles tendon, plantar fascia or another structure entirely. Imaging can be useful when the diagnosis is uncertain or where significant structural tendon damage needs to be excluded.

LDRT is therefore most relevant when there is a chronic, localised and clinically well-defined painful condition, without a full-thickness tendon tear or another mechanical problem that requires a different form of treatment.

A Selective Approach at Pinpoint Radiotherapy

At Pinpoint Radiotherapy, patients with persistent tendon or bursal pain are assessed individually before low-dose radiotherapy is recommended. The diagnosis, duration of symptoms, previous treatments, imaging findings, age and degree of structural tendon damage are considered together.

We are most interested in conditions where there is reasonable clinical evidence and a plausible inflammatory component, including chronic elbow tendinopathy, Achilles tendinopathy and greater trochanteric pain syndrome. For other tendon and bursal conditions, the evidence may be less established and treatment is considered more selectively.

Low-dose radiotherapy is not intended to replace rehabilitation or correct a mechanically damaged tendon. Its role is to provide another non-invasive option for carefully selected patients whose chronic pain has persisted despite appropriate conservative management, with the aim of reducing pain sufficiently to restore movement and everyday function.