Pistorius, the star of the London 2012 Paralympics, was sensationally beaten into the silver medal position by Brazil's Alan Oliveira on Sunday, in a result that stunned the Olympic Stadium.
The 25-year-old then hit out at the International Paralympic Committee (IPC), claiming it was not a fair race and he was at a disadvantage caused by artificial leg length, as the regulations allowed athletes to make themselves "unbelievably high".
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Pistorius, who had both legs amputated below the knee, runs on carbon fibre blades, as does Oliveira.
"I would never want to detract from another athletes' moment of triumph and I want to apologise for the timing of my comments after yesterday's race," the South African said in a statement.
"I do believe that there is an issue here and I welcome the opportunity to discuss with the IPC but 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 who obviously share these aims."
