Another joint abnormality that occurs is called tibial torsion, which is the outward rotation of the lower leg. While standing, this type of torsion causes the foot to turn outward and the knee to turn inward. This position can be painful. It also influences walking and running mechanics. With the foot facing outward, the last point of contact when walking becomes the outside ridge of the foot, which leads to abnormal gait mechanics. Walking can become tiring, slower, and painful. Children may also experience foot pain because of flattening arches. If untreated, adults can experience tight iliotibial (IT) bands, knee arthritis, and/or hip and back pain.