Split posterior tibial tendon transfer through the interosseus membrane in spastic equinovarus deformity.

The split posterior tibial tendon transfer procedure was first reported by Green for correction of equinovarus hindfoot deformity in patients with cerebral palsy. A modification of the split posterior tibial tendon transfer combined with an Achilles tendon lengthening is described in 17 children (21 procedures) with a minimum follow-up of 3 years. This modified technique is indicated in young children with a continuously spastic posterior tibial tendon to correct a dynamic equinovarus. It restores active dorsiflexion when the anterior tibial and extensor muscles are weak. The anterior half of the split tibialis posterior is transferred through the interosseus membrane to the dorsum of the foot. Excellent or good results and two poor results were noted after a mean follow-up of 29 months. In the patients with an excellent or good result, marked improvement of their equinovarus foot deformity in stance and swing phase of gait was seen. In two patients, the procedure failed because of technical errors.