Unfair advantage? Because they produce less force with each step, lightweight sprinting prostheses probably don't give amputee athletes a leg up. Credit: Orthopedic Specialty Hospital

From Michael Torrice in ScienceNOW Daily News.

In 2007, South African double-amputee sprinter Oscar Pistorius became the first disabled athlete to compete against able-bodied runners, placing seventh in the British Grand Prix. But his J-shaped carbon-fiber prostheses, called the Össur Flex-Foot Cheetah, sparked a debate within the athletic world: Do the devices give him an unfair advantage over able-bodied competitors? The answer, according to a new study of six amputee sprinters, is no.

Scientists debate whether the Össur Cheetah boosts performance. Some experts believed that Pistorius’s setup would allow him and other amputee sprinters to move their legs faster than able-bodied runners and reach high speeds more easily. But last summer, a team of researchers at the Massachusetts Institute of Technology (MIT) in Cambridge showed that Pistorius’s prosthetic limbs didn’t generate as much force against the ground as biological legs.

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