ABSTRACT
Congenital calcaneus deformity is usually part of calcaneovalgus, either seen as an isolated deformity (Figure 4.1a) or in association with congenital posteromedial bowing of the tibia (Figure 4.1b). Congenital calcaneovalgus is a supple deformity in most instances; rarely, a rigid form may be encountered.1 Acquired calcaneus deformity is most frequently associated with paralysis or weakness of the gastrocsoleus muscle (Figure 4.1c). Apart from neurological conditions that may cause weakness of the gastrocsoleus, excessive lengthening of the Achilles tendon in an effort to overcome an equinus deformity can result in a calcaneus deformity.2 Less frequently, a calcaneus deformity can develop due to contracture of the muscles of the anterior compartment of the leg.
