Choosing Fusion Levels in Progressive Thoracic Idiopathic ScoliosisKnapp, D Raymond Jr., MD1; Price, Charles T., MD1; Jones, Eric T., MD, PhD*; Coonrad, Ralph W., MD†; Flynn, Joseph C., MD1Spine: October 1992 - Volume 17 - Issue 10 - p 1159-1165 Original Article: PDF Only Buy Abstract Author InformationAuthors The selection of fusion levels in thoracic idiopathic scoliosis was subjected to multicenter retrospective review to test the validity of the classification system and recommendations of King et al. The 253 patients reviewed were treated by posterior fusion and Harrington instrumentation. Bending films were of little help in selecting fusion levels. Standing radiographs alone were usually adequate. King Type II curves may yield better lumbar correction if the lumbar curve is partially included in the fusion. Type IV curves may be safely fused one level proximal to the stable vertebrae. 1From the Orlando Regional Medical Center, Orlando, Florida, and Florida Elks Children's Hospital, Umatilla, Florida *From the Department of Orthopaedic Surgery, West Virginia University, Morgantown, West Virginia †From the Durham County General Hospital, Duke University Medical Center, Durham, North Carolina © Lippincott-Raven Publishers.