Relating to the technique of replacing a human limb with an artificial one (6)
I believe the answer is:
bionic
(Other definitions for bionic that I've seen before include "Of person, operated electronically, not naturally." , "Using electromechanical body parts" , "Partly electronic and partly human" , "Operated by electrical means, not naturally, like science-fiction man" , "With superpowerful, artificial, body" .)