C-Leg and Bionic limbs

Just been reading about a very courageous American guy called Kevin Pannell

Below is the a weblink to his story. It talks about his injuries during war and also his recovery and subsequent use of the C-Leg and other 'bionic' prosthetics.

What an amazing guy.
http://www.popularmechanics.com/science/medicine/1303041.html?page=1&c=y