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e-bending radiographs when determining Lenke classification in patients with Adolescent Idiopathic Scoliosis. III. III. Retrospective case-control. To identify a cohort of patients with persistent coronal imbalance (CI or revision surgery 5 years following fusion to an L3 lowest-instrumented-vertebra (LIV) and determine factors that make an L3 LIV high-risk. In surgical planning for AIS, L3 is chosen over L4 whenever possible to maximize motion segments below the LIV. Though fusion to an L3 LIV is common, the rate of failure and its risk