Kehayov, Raytcho, and Sofia Nikolova. “Rare, But Existing Complications After Calcaneal Lengthening Osteotomy for the Treatment of Symptomatic Planovalgus Deformity in Children and Adolescent ”. THE JOURNAL OF THE BULGARIAN ORTHOPAEDICS AND TRAUMA ASSOCIATION, vol. 59, no. 01, July 2022, pp. pp.36-43, doi:10.58542/jbota.v59i01.18.