The Artificial Leg, 1846, by Benjamin Franklin Palmer

From: artofinvention.tripod.com

This artificial leg introduced a new concept in prosthesis. The articulated joints at the knee, ankle and toe began the concept of natural-looking movement in artificial limbs.

Palmer instituted the idea of eliminating large unsightly gaps between the various components of his leg and of putting springs and movement limits into the limb to give the appearance of natural movement.

Palmer's artificial leg received an award at the first World's Fair at the Crystal Palace in London England in 1851.