Anterior tibial tendon transfer in relapsing congenital clubfoot: long-term follow-up study of two series treated with a different protocol

Two series of patients with relapsing congenital clubfoot were treated by transfer of the anterior tibial tendon to the third cuneiform under the extensor retinaculum. The two series were reviewed at the end of skeletal growth to evaluate the effectiveness of the surgical procedure. The first series included 19 clubfeet and the second 16. The two series of clubfeet were initially treated by two different manipulative techniques and two different complementary soft tissue release operations. In relapsing clubfeet, the foot dorsiflexion/eversion activity of the tibialis anterior was suppressed and the muscle functioned as an invertor. At follow-up the functional results of the second series of patients, in whom the relapsing deformity was passively correctable at the time of surgery, were better than those of the first series of patients, in whom the relapsing deformity was sometimes less passively correctable. None of the operated patients had a further relapse. In both series, the angles formed by the longitudinal axis of the navicular and the first cuneiform, the calcaneus and the fifth metatarsal, and the calcaneus and the cuboid, evaluated both by plain radiographs and by CT scan, were smaller than in normal feet and in the clubfeet that did not relapse. Transfer of the anterior tibial tendon to the third cuneiform underneath the extensor retinaculum corrects and stabilizes relapsing clubfeet by restoring their normal function of foot dorsiflexion/eversion. As a consequence, the cuneiforms and the cuboid were shifted more laterally than normal, as shown by both x-rays and CT scan.