planovalgus deformity planovalgus deformity planovalgus deformity is a postural deformity, flat foot typology, very frequent in people with cerebral palsy and often due to muscle imbalance resulting in a predominance of the pronotory versus the supinatory forces. flat feet with planovalgus deformity treatment surgical treatment in the presence of planovalgus deformity can be of two types: grice-viladot technique, which is performed if the patient is over 8 years old. dual arthrodesis technique, which is performed if the patient is over 12 years old. both techniques provide for a thirty-day subsequent protection with a plastered knee-high without load. bibliography (in italian) p.f. costici, r. russo: il piede piatto neurogeno in il piede piatto infantile isbn 9788854867772 p.f. costici, r. russo, o. palmacci: surgical techniques for pes planovalgus deformity in cerebral palsy in journal of orthopaedics and traumatology