Sprinter loves his flexi-feet

Without the help of a flex feet prosthetics, Australian Paralympian Stephen Wilson may not have had the chance to participate in three Paralympics since Sydney, where he won two gold medals.

Not just for Wilson, the flex feet have been a first-choice prosthetic for most athletes with one or both legs amputated, including "Blade Runner" Oscar Pistorius of South Africa.

The J-shaped prosthetic sprinting foot takes the place of an amputated leg using carbon fibre and titanium for strength, light weight and extra flexibility. It initially was fairly limited, suitable only for certain types of amputees.