Comparative effects of two calcaneal lengthening osteotomies (Hintermann vs. Evans) in stage II adult-acquired flatfoot

Abstract

Background: Stage II adult-acquired flatfoot (AAF) could be effectively treated by Hintermann (H) and Evans (E) lateral column lengthening (LCL) calcaneal osteotomies. This retrospective cohort study was aimed to compare the post-surgical outcome of this two osteotomies used in Chinese patients. Methods: Of 114 eligible patients (149 feet) with Stage II AAF admitted from October 2018 to October 2022, 92 feet treated by Hintermann osteotomy and 57 feet treated by Evans osteotomy were observed in 2-year follow-up. Pre-surgical and post-surgical radiographic parameters, clinic scores and degenerative changes of related joints were collected and analyzed. Result: Pitch angle, Meary’s angle, Naviculocuboidal (NC) overlap (%), Medial arch sagittal (MAS) angle, Talocalcaneal (TC) angle, Talonavicular (TN) coverage angle, Talus–second metatarsal (T-2MT) angle were significantly corrected by both H-LCL and E-LCL osteotomies (P