508 Upper Instrumented Vertebra within 3 Levels of the Thoracic Apex is the Most Significant Risk Factor for Proximal Junctional Kyphosis in Lenke Type 5 and 6 Adolescent Idiopathic Scoliosis Patients

P0352 Thoracic Kyphosis Increases but Cervical or Lumbar Lordosis Does Not Change through the Unfused Segments after Surgical Correction of Lenke Type 5 and 6 Curves