an orthosis designed to control knee and ankle motion; extends from the upper portion of the thigh, crossing the knee and ankle, and terminating at the toes.
knee-an·kle-foot or·tho·sis
(nē-ang'kĕl-fut ōr-thō'sis) An orthosis extending from the upper portion of the thigh, crossing the knee and ankle, and terminating at the toes; designed to control knee and ankle motion.