“A man who lost his leg in a motorcycle  accident has made history by using a thought-controlled bionic leg to reach the  top of one of the world’s tallest skyscrapers. By simply thinking ‘climb stairs’ – Zac  Vawter, made his way up 103 flights of stairs to the top of Willis Tower in  Chicago on the revolutionary prosthetic leg. The robotic leg responds to electrical  impulses from muscles in his hamstring, with his thoughts triggering motors, belts and chains to synchronise the movements of the prosthetic ankle and knee.”

http://www.dailymail.co.uk/sciencetech/article-2227785/Chicago-man-Zac-Vawter-climbs-skyscraper-bionic-leg.html

http://www.ric.org/research/centers/cbm/