He also looked set to be excluded from the individual event in London after failing to run the Olympic ' A ' standard qualification mark twice in international competition . Oscar Pistorius to become first double - amputee Olympian in London . The 25-year - old has been selected in the individual 400 and 4x400 m relay . He had both of his legs amputated when he was six months old . He won a silver medal at last year 's World Championships in the 4 x 400 m relay .
Oscar Pistorius to become first double - amputee Olympian in London . The 25-year - old has been selected in the individual 400 and 4x400 m relay . He had both of his legs amputated when he was six months old . He won a silver medal at last year 's World Championships in the 4 x 400 m relay .