A long-term follow-up study is presented of twenty-cases of paralysis of the tibialis posterior treated by tendon transfer, mainly of the peroneus longus. All patients had had poliomyelitis and had severe dynamic valgus deformities at the age of two to twelve years.
In seven the correction was maintained permanently and in thirteen a valgus or varus deformity appeared. In six the new deformity appeared during the first two years after the operation. In the other seven this deformity was first noticed after an interval of three to six years. Only one of the recurrent deformities was severe and had to be reoperated on one year later. In twelve cases of slight or medium grade deformity, secondary surgical measures could be postponed until an age when final stabilization of the foot could be performed.