They are also used to immobilize the ankle and lower leg in the presence of arthritis or fracture, and to correct foot drop; an AFO is also known as a foot-drop brace. Ankle-foot orthoses are the most commonly used orthoses, making up about 26% of all orthoses provided in the United States.
adjective. noun. Fundamental is defined as something that is basic or essential. The most basic underlying truth of a religion is an example of a fundamental truth. The definition of fundamental is a basic truth or law. Freedom is an example of a fundamental of the American ideal.
Another word for underlying. adjective. Arising from or going to the root or source: basal, basic, foundational, fundamental, original, primary, radical. See surface. Of or being an irreducible element: basic, elemental, elementary, essential, fundamental, primitive, ultimate. See surface.