The bionic leg from Össur relies on sensors implanted in the body.

A prosthetic leg sits beside the volleyball court as the U.S. Invictus Games seated volleyball team practices for competition. Invictus Games is an international competition that brings together wounded, injured and ill service members in the spirit of friendly athletic competition. American Soldiers, Sailors, Airmen and Marines are representing the United States in the competition which is being held in London, England from Sept. 10-14, 2014. (U.S. Navy photo by Mass Communication Specialist 2nd Class Joshua D. Sheppard/Released)