Sixteen patients (23 feet) who underwent split posterior tibial tendon transfers were evaluated. The patients were seen on a followup basis for a minimum of 1 year postoperatively. The causes were spastic cerebral palsy in 13 feet, spastic-athetoid cerebral palsy in 3 feet, hydrocephalus in 3 feet, and other diseases in 4 feet. The indication for surgery was varus deformity during the stance phase of gait and increased varus deformity during the swing phase of gait because of spasticity of the posterior tibial muscle. Heel cord lengthening was done on 17 feet. Preoperative and postoperative gaits were evaluated while the patients were walking. Axial radiographs of the calcaneus and the tibia were taken of all patients while they were weightbearing. There were 15 excellent, 6 good, and 2 poor results. The poor ratings were assigned to patients who had recurrence of varus deformity; there were no cases of overcorrection. Split posterior tibial tendon transfer was effective for treating spastic varus deformity of the hind part of the foot. This treatment also could be considered for a patient with spastic-athetoid cerebral palsy, if the deformity was determined to be caused by overactivity of the tibialis posterior muscle.
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