Rigid Flat Feet (RFF) or adult acquired flat feet occur in adults. The arch is absent in the standing position and re-appears when the foot is in any other position. It occurs due to weak ligaments that connect the bones of the foot, or due to muscle or tendon weakness. A fallen arch may cause intense foot pain in the feet, ankles, and lower leg muscles.įlexible Flat Feet (FFF) and Rigid Flat Feet (RFF).įlexible Flat Feet (FFF) or pediatric flat feet are first apparent in childhood. Foot arches add elasticity and flexibility and are also very important for proper foot movement. It is also known as pes planus deformity and may occur at the time of birth or may develop over time, mostly due to age or injury. A flat foot is a deformity that occurs when the arch of the foot collapses and comes into contact with the ground.
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