Any of a class of external orthopedic appliances, braces, or splints devised to control, limit, or assist foot and ankle motion and provide leg support. Typically, orthotics are made of lightweight (e.g. thermoplastic) materials.
An ankle-foot orthosis is a brace, usually plastic, that is worn on the lower leg and foot to support the ankle and correct foot drop. By holding the foot and ankle in the correct position, the AFO promotes correct heel-toe walking.