Post Poliomyelitis, a patient has grade H power in Gastrocnemius, grade HI is Peroneus, grade IV in Tibialis Anterior. The deformity is -
Gastrocnemius (plantar flexor) is weak with grade II power, while tibialis anterior (dorsi flexor) is strong with grade IV power, Therefore foot is thrown into 'dorsiflexion' or 'calcaneo' position.
Peronii (everters) provide valgus strain, while Tibialis anterior provides a varus strain. Because peronii are weak here (grade III), the foot goes into varus position.
Calcaneovalgus
Equino varus
Calcaneo varus
Genu valgus