Oscar Pistorius is a South African sprint runner. Known as the "Blade Runner" and "the fastest man on no legs", Pistorius, who has a double amputation, is the world record holder in the 100, 200 and 400 metres (sport class T44) events and runs with the aid of Cheetah Flex-Foot carbon fibre transtibial artificial limbs by Ossur. In 2007 Pistorius took part in his first international competitions for able-bodied athletes. However, his artificial lower legs, while enabling him to compete, have generated claims that he has an unfair advantage over able-bodied runners. The same year, the International Association of Athletics Federations (IAAF) amended its competition rules to ban the use of "any technical device that incorporates springs, wheels or any other element that provides a user with an advantage over another athlete not using such a device". It claimed that the amendment was not specifically aimed at Pistorius. After monitoring his track performances and carrying out tests, scientists took the view that Pistorius enjoyed considerable advantages over athletes without prosthetic limbs. On the strength of these findings, on 14 January 2008 the IAAF ruled him ineligible for competitions conducted under its rules, including the 2008 Summer Olympics. This decision was reversed by the Court of Arbitration for Sport on 16 May 2008, the Court ruling overall there was no evidence that Pistorius had any net advantage over able-bodied athletes.