ScienceDaily (2009-01-01) — Biomedical engineers developed a robotic arm to very precisely resurface the knee before replacing it. In order to do this, a 3-D image of the knee is generated, providing a live-action view of the knee during surgery. A stereo camera system constantly updates surgeons on the location of the diseased portion of the knee–this keeps the healthy parts untouched. Visual alarms and artificial resistance tell the surgeons when they are too close to healthy parts. After the resurfacing is done, the implant is placed.