My friend Mal, who lives in the Bay Area, was one of the designers of the RoboDoc, a robotic arm for hip surgeries. The fit of the new hip is of great importance and the RoboDoc allowed a more precise fit. IBM plowed several million into the development, but unfortunately the management team knew little about managing technology projects and was constantly at odds with the tech people. The company folded. It's a shame because it was a very good product. I don't know if there have been any advancements since then.