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Department of Podiatry

Pes Planus

In those with flat feet, there is a "collapse" of the medial longitudinal arch on weight bearing, with changes apparent on lateral x-ray at a number of joints - the talo-navicular, navicular-cuneiform, cuneiform-first metatarsal, or a combination. An obliteration of the sinus tarsi area can be seen as well as an anterior break in the cyma line. On dorsoplantar x-ray there may be a widening of the talocalcaneal angle and an abduction of the forefoot on the rearfoot. The amount of deviation from the accepted normal of each joint will be variable depending on the position of joint axes of motion, the amount of joint laxity and the cause and amount of the deforming force. It is also of clinical importance to note where the anomaly in alignment is.

Lateral foot radiograph of a pes planus foot. Note that this radiograph is of a person <16 years old (based on that a number of open growth plates exist).

Another lateral foot radiograph. This time, of an adult - in particular, compare the posterior calcaneus to the radiograph above.

 

Content Approved by: Head of Podiatry

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Last Updated: July 8th, 2003