South Africa's 'Blade Runner' Oscar Pistorius has expressed regret over the timing of his outburst following his shock loss to Brazil's Alan Oliveira in the 200 meters final at the London Paralympic Games on Sunday.

Pistorius streaked into an early lead and was almost 10 meters ahead as the athletes came into the home straight but the Brazilian launched a stunning fightback and surged to victory over the final few meters.

The result left the South African double amputee, who was defending his 100m, 200m and 400m Paralympic titles from Beijing, seething and he claimed his opponent's prosthetic blades were too long.

In a statement on Monday, the sprinter stuck to his claim but apologized for raising his concerns immediately after.

"I want to apologize for the timing of my comments but I do believe that there is an issue here," said the 25-year-old, who last month became the first double amputee to run in the Olympics and made the 400 meters semi-finals.

"I accept that raising these concerns immediately as I stepped off the track was wrong.

"That was Alan's moment and I would like to put on record the respect I have for him.

"I am a proud Paralympian and believe in the fairness of sport. I am happy to work with the IPC (International Paralympic Committee) who obviously share these aims."