Ultrasound therapy has been around for about fifty years, it has been used for imagining and well as therapeutic ultrasound for sports injuries RSI and other trauma type issues.
Ultrasound works by sending a sound pulse beyond the range of human hearing from an applicator head into soft tissue, muscle, joint and ligaments.
Ultrasound has been shown to cause increased tissue relaxation, increased local blood flow, and scar tissue breakdown. The increase in local blood flow can be used to help reduce local swelling, chronic inflammation, some studies it to promote bone fracture healing rates.
In clinic I have used ultrasound for sprain type injuries, twisted ankle, sprained wrist, muscle strains etc where for the first week or so the injury is too painful for manual therapy so gentle ultrasound and acupuncture work really well together alleviate pain, inflammation, discomfort and improved healing times - especially useful for team sports like rugby, football etc
Ultrasound for 'RSI' or repetitive strain injury can be sports related or even an overloading workplace injury. This type of inflammatory injury responds well to gentle ultrasound which has a deep effect on tendons and ligaments allowing a more normal range of joint motion and function.