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These slides are retrieved under Electronic Supplementary Material.PURPOSE to analyze whether the rotation of preoperative-presumed lowest instrumented vertebra (LIV) is a risk element for adding-on (AO) in adolescent idiopathic scoliosis (AIS) treated with selective posterior thoracic fusion (sPTF). PRACTICES an overall total of 196 AIS clients of Lenke type 1A or 2A with minimum 2-year follow-up after sPTF with all pedicle screw instrumentation had been included. Radiograp