Introduction
Congenital talipes equinovarus (CTEV) is a deformity in which the foot is in structural equinus, varus, adductus and cavus and occurs in approximately 1 per 1000 births [1]. Despite good initial correction with the Ponseti technique, a tibialis anterior tendon transfer (TATT) is required in 20-25% of cases to correct residual dynamic supination observed during gait. Currently, no reliable or valid biomechanical measures exist to assess the need for, or effectiveness of, surgery.