Indication Arthritis Principle of Focused Ultrasound Therapy Ultrasound wave has good characteristics of penetrability, focusing and energy deposition. The low intensity ultrasound passing through tissue can be focused into articular cavity safely and forming relatively high intensity ultrasound in the focal region. The mechanical effect and cavitation effect of the focused ultrasound can promote the release of endogenous analgesic substance of the body , enhance the nutrition exchange between joint fluid and cartilage cells, which will restrain inflammation, repair cartilage and alleviate pain. Clinical and Technical Advantages 1. The only Physiotherapy for Arthritis recognized by AAOS (American Academy of Orthopaedic Surgeons) 2. Immediate symptom alleviation right after treatment 3. Easy operation for doctors 4. Precise targeting based on four independent adjustable transducers 5. Ergonomic design 6. Adjustable energy output from level 1 to 8 7. Environmental friendly therapy without radiation or pollution