e489 Comparative Analysis of Factors Associated with Achieving Clinical Improvement in Adult Spinal Deformity Patients after Reoperation for Junctional Failure, Instrumentation Failure, or Pseudoarthrosis

e540 Development of a Modified Surgical Invasiveness Index for Minimally-Invasive Adult Spinal Deformity Surgery

e547 Durability of Substantial Clinical Benefit in Adult Spinal Deformity Corrective Surgery Patients: A Minimum 5-Year Outcomes Analysis

The Challenge of the Clinical Practice Guidelines: How to Overcome the Limitations of Evidence-Based Science in the Rapidly Progressing Field of Orthobiologcs