The AMEDA device consists of a hinged plate which rotates around an axle under the long axis of the foot being tested.
With their feet placed shoulder-width apart, standing with both legs in a weight bearing position, subjects were asked to stand in a relaxed posture on the platform of the AMEDA, with the foot of the limb being tested centered over the axis of movement of the movable base plate.
The participant made an active inversion movement which moved the plate and the outer side of the foot down until contact was made by the rim of the plate on an adjustable metal stop.
The participant then returned the plate to the horizontal stopped position at the same steady pace, and made a judgment as to the degree of inversion achieved during the movement.