Researchers at University of North Carolina and North Carolina State University have developed a Prosthetic Implant that can be fitted as per amputee requirement and timing. These implants need t conform to patient's specific anatomy and require 12 month rehabilitation. However, FDA has not approved implanted prosthetic sockets for general use; but only for research purposes.
Source: http://www.prnewswire.com/news-releases/improving-the-lives-of-amputees-300232669.html