The bionic hand, for people who have had theirs amputated, can do just about anything a flesh and blood hand can do except have a sense of touch. Captain Hook would have been amazed! Even conventional prosthetic limbs are far better than peg legs.
And scientists are working on other contraptions to replace body parts. Let's see, we now have pacemakers, cochlear implants, joint replacements, speech prosthesis devices, JAWS, SARA, RUBY, artificial limbs, and lots of others. What an amazing world we live in!