The future of orthopaedic medical devices is small—microscopically small. Micro Electro Mechanical Systems, referred to as MEMS devices or sensors, are already used in a host of medical devices, doing tasks that were previously only conceived of in science fiction. Sensors the size of a flea can now measure strain, temperature or resistivity. They can measure acceleration, frequency and electrical impulses. MEMS can be used to make microscopic gears to tune hearing aids, capa