Low-Dose Radiotherapy for Plantar Fasciitis and Persistent Heel Pain

When Plantar Fasciitis Becomes Persistent

Plantar fasciitis is one of the most common causes of heel pain. Symptoms are typically worst with the first few steps after getting out of bed or after sitting for a period, and can become increasingly limiting with prolonged walking or standing. Although the name suggests inflammation, persistent plantar fasciitis is often better understood as a chronic disorder of the plantar fascia where degenerative change and ongoing inflammatory activity may both contribute to pain.

Most people improve with time and conservative treatment, which may include stretching, footwear modification, orthotics, physiotherapy, pain relief and sometimes injections. Low-dose radiotherapy is therefore not usually an early treatment. Its potential role is in persistent symptoms that have continued despite reasonable conservative management.

LDRT does not remove a heel spur or mechanically alter the plantar fascia. Instead, low doses of radiation are thought to modify inflammatory activity within the painful tissues, with the aim of gradually reducing pain and improving walking and function.

What Does the Evidence Show?

Radiotherapy for persistent plantar fasciitis has been used in Germany for many decades and is incorporated within German guidance for painful degenerative musculoskeletal conditions. Large German clinical series have consistently reported substantial rates of pain improvement, and plantar fasciitis also has useful randomised trial evidence.

In the landmark Niewald multicentre randomised trial, patients received either the established 6 Gy course or an ultra-low 0.6 Gy comparison dose. The therapeutic dose was clearly superior, with complete pain relief reported in up to 80% of patients receiving the standard dose. Only 17.2% of patients in this group required another treatment course compared with 63.6% after the ultra-low dose, and benefit was maintained through one year.

A separate randomised trial compared LDRT directly with a local corticosteroid injection. At six months, approximately 68% of patients treated with radiotherapy had a complete or substantial partial response compared with about 28% after steroid injection, with significantly better pain and functional outcomes following radiotherapy.

Taken together, the longstanding German experience and these randomised studies provide a reasonable evidence base for considering LDRT in chronic plantar fasciitis that has not responded adequately to conservative treatment.

What Does Treatment Involve?

At Pinpoint Radiotherapy, persistent plantar fasciitis is typically treated with 1 Gy over six treatment sessions spread over two to three weeks, for a total dose of 6 Gy. This differs from our usual osteoarthritis regimen and reflects the treatment schedules used in much of the plantar fasciitis evidence.

Treatment is non-invasive and generally delivered over approximately two weeks. The painful heel and plantar fascia are positioned within a small treatment field, and each session itself is brief. There are no needles or anaesthetic, the radiation cannot be felt, and patients can walk out immediately afterwards.

Improvement is often gradual rather than immediate. Some patients notice a change within the first few weeks, while others continue to improve over several months. If there has been a worthwhile but incomplete response, a further course can sometimes be considered after sufficient time has passed to assess the initial effect.

Acute side effects are uncommon at these doses. There remains a small theoretical long-term risk from radiation exposure, but treatment of the foot involves a relatively small peripheral area of the body, away from most internal organs and large volumes of active bone marrow.

Our Approach to Persistent Heel Pain

At Pinpoint Radiotherapy, LDRT is considered for patients with chronic plantar fasciitis where heel pain continues to interfere with walking, exercise or everyday activities despite appropriate conservative treatment.

The diagnosis is reviewed carefully because not all persistent heel pain arises from the plantar fascia. The duration and pattern of symptoms, previous treatments, examination and relevant imaging are considered before deciding whether radiation is appropriate.

For selected patients, plantar fasciitis is one of the better-established non-arthritic indications for low-dose radiotherapy, supported by decades of clinical experience and randomised evidence demonstrating meaningful improvement in persistent pain.

The aim is straightforward: to reduce heel pain sufficiently to make standing, walking and normal activity easier again, using a short, targeted and carefully selected course of treatment.