Split tibialis posterior tendon transfer and tendo-Achillis lengthening for spastic equinovarus feet.

Twenty-one patients with a minimum follow-up of 2 years who underwent combined split tibialis posterior tendon transfer and tendo-Achilles lengthening for equinovarus foot deformities were evaluated. The results in 15 of 18 ambulatory patients were graded as excellent or good; patients had marked improvement of their equinovarus foot deformity in both stance and swing phases of gait and became brace-free postoperatively. All non-ambulatory patients had a plantigrade foot. The complication rate was low, and patient satisfaction with the procedure was very high. In three patients, however, the procedure failed because of technical errors. We address the causes of failure and methods to avoid these errors. Preoperative computerized gait analysis does not appear to be essential in achieving a good result.