Rocker-bottom feet : In Edward syndrome

In rocker-bottom feet the bones are arranged in a different way and this makes the underside of the foot convex in the middle: the foot appears to bend in the opposite direction to normal and in so doing it resembles the shape of the bottom of a rocking chair.

(Normally the underside of the human foot is concave in the middle: the bones of the foot are arranged in such a way that there is an arch-like shape in the mid-part of the foot.)