Fulcrum Side-Bending Radiographs as Predictors of Postoperative Shoulder Imbalance in Lenke Type 5 Adolescent Idiopathic Scoliosis

Introduction: Postoperative shoulder imbalance (PSI) is a cosmetically and psychologically significant complication following surgical correction of adolescent idiopathic scoliosis (AIS). While commonly studied in thoracic curve patterns, its occurrence in Lenke type 5 curves remains under-investigated. This study aimed to identify radiographic predictors of PSI in Lenke type 5 AIS, with particular emphasis on preoperative fulcrum side bending (FSB) flexibility assessment.