Technically called radial shockwave therapy (RSWT), this technique uses short, powerful bursts of sound to provide pain relief to muscles, joints and the adhesions (scars) from injuries.
It works on conditions like tennis elbow, chronic tendinitis in the knee, rotator cuff pain, achilles tendonitis, hamstring tendonitis, and plantar fasciitis.
Similar to the way that lifting weights causes micro-traumas that the body then repairs, the shockwaves stimulate growth of new blood vessels (angiogenesis) and new nerve cells (neurogenesis). In truth, no one is really 100% sure how it works, but the results have been well-documented in many double blind, peer-reviewed studies.
This type of therapy has proven to reduce pain significantly, without the use of drugs or surgery.