Evans osteotomy and risk to subtalar joint articular facets and sustentaculum tali: a cadaver study.

The Evans lateral column lengthening procedure allows correction of abduction, improved talar head coverage, decreased forefoot and rearfoot valgus, and improvement of medial column arch height. However, identifying the structures at risk when performing this osteotomy has proved difficult in vivo. Using 10 cadaveric lower limbs, we performed the Evans calcaneal osteotomy and determined whether violation of the calcaneal facets and the sustentaculum tali occurred. Based on our findings, we recommend directing the osteotomy from posterolateral to anteromedial.