In adolescents (boys in particular), painful flat foot may be found in association with apparent spasm of the peroneal muscles. The foot is held in a fixed, everted position. Inversion of the foot is not permitted, and there is often marked disturbance of gait. The condition is frequently associated with ossification in a congenital cartilaginous bar bridging the calcaneus and navicular (tarsal coalition). This anomaly may be demonstrated radiologically. Surgery in the form of excision of the bar is now the normal treatment for this condition.
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