Endosinotarsal vs. Exosinotarsal Subtalar Arthroereisis in Treating Pediatric Flexible Flat Feet: A Systematic Review and Meta-Analysis of Comparative Studies.

Background: Pediatric flexible flatfoot (FFF) is a common condition characterized by the collapse of the medial longitudinal arch, which can lead to pain and functional impairment in a subset of patients. Subtalar arthroereisis (AR) is a minimally invasive procedure that corrects FFF by limiting excessive pronation of the subtalar joint. Two main techniques exist: endosinotarsal AR, which involves placing an implant in the sinus tarsi, and exosinotarsal AR, which uses a screw external to the sinus tarsi.