This article from the San Francisco Chronicle provides a nice overview of the history and current state of prosthetic devices and implants. The report makes the important distinction between what is reality and what is still fantasy for the “bionic human”.
Don’t forget our bodies are composed of living tissue, which doesn’t like sitting near plastic and metal. This is the most difficult limitation at this time making the prospect of humans entirely re-composed of artificial parts very arduous.
Until we can build functioning devices out of the living tissue itself, don’t expect seeing Bionic Woman walking around in your neighborhood any time soon.