PARIS (AFP) - South African 'Bladerunner' Oscar Pistorius has taken his fight to have an Olympic ban overturned to the international Court of Arbitration for Sport (CAS).

The disabled sprinter, who had both his legs amputated below the knee as a child and runs with carbon fibre blade attachments, wants to be allowed to compete in the 400m in normal Olympics as well as the Paralympics.

But the International Association of Athletics Federations (IAAF) took the decision to prevent Pistorius from competing in the Beijing Olympics after a scientific study revealed that he used 25 percent less energy than able-bodied runners to run at the same speed.

The 21-year-old spent two days in Cologne, Germany, last November undergoing tests alongside five able-bodied athletes of similar ability but he rejected the findings, claiming the tests were flawed.

Now Pistorius has appealed to CAS, and the Lausanne-based body will likely deliver its verdict within four months.

Were he to receive a favourable outcome from CAS, Pistorius would still have to improve on his personal best of 46.46sec to achieve the Olympic minimum qualifying standard of 45.95sec, or 45.55 should another South African beat that mark.