the unique advantages of computer - controlled fabrication of a patient - specific orthotic device using an automated fabrication machine capable of following computer instructions to create 3d surface contours and new developments in non - invasive three - dimensional scanning have made it possible to acquire digital models of freeform surfaces such as the surface anatomy of the human body and to then fabricate such a patient - specific device with high precision . such a patient - specific device brings significant improvement in patient - specific fit , comfort , and function of medical devices . the combination of these two technologies is ideally suited for the development of patient - specific orthotic devices . a patient specific ankle - foot orthotic device using this technology is disclosed . this exemplary device is used to help stabilize the ankle - foot region , for example , in patients with impaired gait .