South Africa’s Oscar Pistorius competes during round 1 of the men’s 400m heats at the London 2012 Olympic Games at the Olympic Stadium

South Africa's Oscar Pistorius competes during a preliminary heat of the men's 400 meters. (REUTERS/Phil Noble)

South Africa’s Oscar Pistorius competes during a preliminary heat of the men’s 400 meters. (REUTERS/Phil Noble)

South Africa’s Oscar Pistorius competes during round 1 of the men’s 400m heats at the London 2012 Olympic Games at the Olympic Stadium August 4, 2012. REUTERS/Phil Noble (BRITAIN – Tags: SPORT ATHLETICS OLYMPICS)