After a four-year battle to qualify for the Olympics as the first double amputee runner, Oscar Pistorius has overcome yet another obstacle ahead of his first race at the London Games.

The key breakthrough is that Pistorius should be allowed to run any of the four parts of the Olympic 4x400-meter relay and will not be held back by concerns his carbon fiber blades would endanger others once runners leave their lanes after the first lap. As a slow starter, he is better suited to running in the later stages of the relay.

Because of it, what once was considered an outlandish idea -- a man with prosthetic legs.

Pistorius says that "I don't know which leg I am going to run, but I am ready to run whichever leg they will ask me to run."