Flat feet, also known as pes planus, is a condition of the foot where or the inside (medial) arch is in a lower position than average. (Sometimes referred to as fallen arches) In some cases the medial arch may partly or completely touch the floor when a person is standing.Anatomically speaking pes planus occurs when the talus bone displaces medially. This causes the foot to pronate. In some cases pes planus develops overtime while there are other individuals that are born with this tendency. Some flat feet can cause foot, ankle, knee or hip pain. Flat feet can also sometimes worsen overtime or develop arthritis. There are many nonsurgical treatments for flat feet including anti-inflammatory medications, bracings, orthotics, and physical therapy. In severe cases flat feet may require surgery involving bony correction or tendon repair.