Rapid prototyping has been used for ortho and maxiofacial reconstruction for a while now. The only thing really new is direct fabrication in metal instead of producing a wax/plastic master that is cast (lost wax).
They were doing rapid prototyping models as armatures to fabricate plates for this here in albuquerque in the 90s, actually (a friend's brother is a maxiofacial plastic surgeon). The rapid prototyping guys are nearby the seeking bullet guys out at Sandia
I did some work over there, actually. We were using plastics, but we got the tour of the selective laser sintering, and direct metal deposition machines, too. Cool stuff. They were working with the Navy as a way to provide spare parts on carriers. You have all the parts on disk, and you print replacements as needed (replacements were designed to get you back to port, not to replace originals---though that was so long ago, there may be no difference now).