Additional Risk Factors for Adding-On After Selective Thoracic Fusion in Adolescent Idiopathic Scoliosis: Implication of Lowest Instrumented Vertebra Angle and Lumbosacral Takeoff

After excluding the effect of known risk factors for AD, LIV-H angle, and LIV-H mismatch with LSTO were found to be the additional risk factors for AD. In addition to consideration of other risk factors such as LIV selection or Risser stage, these risk factors should be considered.