Evans calcaneal osteotomy for flexible pes valgus deformity. A preliminary study.

This procedure was quite successful, particularly in patients with a transverse plane dominant flexible pes valgus deformity. The modifications that have proved to be successful include the use of the oblique skin incision following the relaxed skin tension lines, the use of allogeneic bone graft, and the use of ancillary procedures, including the gastrocnemius recession and medial arch tendosuspension. The procedure is less predictable in those patients whose deformity is primarily in the frontal or sagittal plane. It is most critical that preoperative analysis be used to discover the presence of the masked metatarsus adductus prior to performing this procedure.