From crushing kidney stones to repairing tendons with acoustic waves

Health · Published 20 October 2026 Swipe more like this →

In short: In the 1980s, doctors noticed a strange side effect: using shock waves to shatter kidney stones was inadvertently strengthening nearby bones. This observation sparked a revolution in physical medicine, transforming a tool for urology into a noninvasive therapy for chronic pain and complex tissue repair.

Extracorporeal shock wave therapy (ESWT) works by applying high-energy acoustic waves to the body from outside the skin. There are two primary forms: focused ESWT, which transmits waves in a narrow pattern, and radial ESWT, which distributes them in a diffuse, radial pattern. Radial ESWT typically uses compressed air to accelerate a projectile up to 80 to 90 kph, striking a metal applicator to generate pressure waves that reach tissue depths of 4 to 5 cm.

While its origins lie in lithotripsy—the destruction of kidney stones—research in the 1990s and early 2000s revealed its potential for musculoskeletal and neurological conditions. It is now used to treat tendinopathies (like Achilles or patellar tendinopathy), bone fractures, and even neurological spasticity caused by stroke or multiple sclerosis. The mechanism involves promoting healing, increasing cellular metabolism, and speeding up revascularization by inducing microtrauma that triggers the release of angiogenic factors.

The clinical evidence is nuanced. A 2024 meta-analysis of 65 publications involving 3,921 cases found that ESWT effectively improves pain in lateral epicondylitis, Achilles tendinopathy, and rotator cuff tendinopathy, but showed no significant therapeutic effect over a placebo for patellar tendinopathy. Because results vary by condition, organizations like NICE in the UK suggest using it only under specific clinical governance. Experts emphasize that while the data is promising, more standardized protocols are needed to define optimal dosing and mechanisms.

Safety is generally high, with mild side effects like skin redness or swelling being common. However, severe risks like tendon rupture or bone fractures are exceptionally rare. Contraindications include treating air-filled tissues like the lungs, pregnancy, or active infections.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

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