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Gait articulated ankle-foot orthoses including an articulated ankle joint that are designed to provide an additional reactive (i.e., the floor reaction) force and momentum to the knee by carefully choosing the orthotic ankle angle and blocking the forward tibial movement. These orthoses typically consist of semi-rigid or rigid orthoses encircling the lower leg and foot and an ankle joint mechanism; they are made of thermoplastics or, less frequently, of metal and leather. Floor reaction articulated ankle orthoses facilitate the normal function of an otherwise partially or totally disabled ankle joint or foot. These devices alleviate pain and facilitate stance in patients with weak ankle joints (e.g., as a sequel of poliomyelitis).
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