clubfoot or talipes, deformity in which the foot is twisted out of position. Maldevelopment is usually congenital, although it can result from injury or disease (e.g., poliomyelitis) after birth. It can affect one or both feet. Often the foot is twisted downward, with the heel and toe turning inward, causing only part of the foot—the heel, the toes, or the outer margin—to touch the ground; walking is difficult or impossible. Correction can be made in infancy by manipulation, braces, and casts; in severe cases only surgery can correct the condition.