The doctor will diagnose flatfoot based on family history of congenital foot deformity or traumatic history of bone. And doctor will do a physical exam to check for signs of flatfoot, include: A long time station or walking foot pain or discomfort, with valgus flat foot, the former foot eversion, scaphoid tubercle tenderness and swelling, rest reduce or disappear. Spastic flatfoot late, after a longer period of time to rest, can not improve symptoms.Standing lateral X-ray film is adequate scaphoid tubercle can be seen completely collapse, and increase the distance of sustentaculum tail. Since the nodules at the bottom of the calcaneus bone to the bottom of the first to make the connection from and to this point from the scaphoid tubercle as a vertical line to connect, and its length is less than 1cm.
X-ray are used to confirm diagnosis for flatfoot. X-ray examination should be taken under the conditions of full weight-bearing lateral X-ray films are mainly in the foot arch side of the angle of measurement change.
along the distance, a boat, the first metatarsal bone and the long axis of wedge Center draw a straight line, and then draw in the central scaphoid after a joint appearance with its straight lines equal, and a line of each cross. Arch was usually two lines intersect at right angles or ligament laxity if lesions occur in the joints from the boat, a boat, the first wedge of bone metatarsal bone and the central axis with the axis of each talus discontinuous, and the formation of the foot-side point of view, the central axis of talus wire after scaphoid plantar side 1 / 4, if the ligaments to relax in the boat wedge joints, the talus is located in the central axis of the first metatarsal bone wedge side with scaphoid intersect at right angles to the vertical center. When the center through the scaphoid extended straight forward, are located in the talus and the first plantar metatarsal at the side. Zhou and Zhou show that the wedge away from the joint ligaments are lax.
talus plantar flexion angle: along the side of the foot and draw a horizontal line intersecting the central axis of talus. Normal to 26.5 ° ± 3.5 °. When the talus have when plantar flexion deformity. Increase this angle.
dorsal metatarsal angle from the boat: In the weight-bearing on the film is situated along the distal scaphoid joint First draw parallel lines, then draw a talus axis, the two lines intersect the medial angle formed by said metatarsal angle back away from the boat. Normal for the 60 ° ~ 80 °. This angle> 60 ° show that the shift has talus.
