The Step-On family of products is a range of innovative ankle-foot-orthoses (AFOs) for the treatment of drop foot. The unique feature of these AFOs is that they are active dynamic, offering mechanical assistance by a spring mechanism to assist dorsiflexion, which can be finely adjusted and quantified. This differentiates them from passive dynamic AFOs which rely on the stiffness of the material to assist / resist movement and with that stiffness being non-adjustable, or from static AFOs which allow no movement or assistance. This way Step-On AFOs allow essential sagittal plane kinematics during the gait cycle, while at the same time providing the exact amount of control required by each patient, at every stage of their rehabilitation.