As reported in this article, surgeons in Scotland are using a robot arm to complete knee surgery. The surgeons are still necessary in this equation--they control the arm while watching their progress on a screen. The article doesn't go into details about the possible benefits, but I imagine that this method of surgery is more controlled with a narrower margin for error. I also think it separates the doctor from the patient. Doing an operation with a device while watching a screen? Sounds like a video game to me.