Marmaduke Loke: a big step forward

US orthotic specialist Marmaduke Loke is fitting customised carbon fibre leg braces which are allowing polio survivors to walk properly for perhaps the first time in their lives. He tells Kathryn Ryan about these "blade runner" type orthotics, the only type in the world which help people walk by realigning bones in the foot and the leg. He's joined by polio survivor Gordon Jackman, chief executive of the Duncan Foundation, who says Marmaduke has taught him to walk.