This cute cat is named Oscar. He lost his rear legs in an accident, but thanks to veterinary surgeon Noel Fitzpatrick and some bionic leg implants, Oscar can walk again. Here is a video of some of his first steps.
Apparently Fitzpatrick drilled holes into what remained of Oscar's legs and attached the special metal implants we see in the video. They look like little pegs now, but "eventually, Oscar's skin is expected to [grow] over the implants so the prosthetic attachment will become a part of his body." [Wired]