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wheelchair (wc) a mobile chair equipped with large wheels and brakes. If long-term use of the chair is expected, a physical therapist may prescribe certain personalized requirements, such as size, left- or right-hand propulsion, type of brakes, height of armrests, and special seat pads.
1 Body mechanics - refers to the best or safest body position to use in order to accomplish a heavy task.  Casters - the two small wheels at the front (or the rear) of the wheelchair which swivel in all directions. They contribute to the maneuverability of the wheelchair and come in either solid or pneumatic styles.