Rigid valgus foot from fibrous contracture of the peronei.

In a review of the etiology of peroneal spastic flat foot, Harris and Beath in 1948 showed that this term was often applied indiscriminately and inaccurately to rigid flat feet of at least three different types. In two there was an anomaly of tarsal structure with fusion of the calcaneum either to the navicular bone or to the talus. A deformed, rigid foot was produced without true peroneal spasm, although those muscles were adaptively shortened because of the valgus deformity. The third type was caused by an inflammatory arthritis of the tarsal joints with protective peroneal spasm which twisted the foot into valgus. In their own series of seventeen cases twelve had a talo-calcaneal bridge, three had calcaneo-navicular bars and