Illustration from: Sanders JO, Khoury JG, Kishan S, et al. Predicting scoliosis progression from skeletal maturity: A simplified classification during adolescence. J Bone Joint Surg Am 2008; 90:540. DOI: 10.2106/JBJS.G.00004. Copyright © 2008 The Journal of Bone and Joint Surgery, Inc. Reproduced with permission from Wolters Kluwer Health. Unauthorized reproduction of this material is prohibited.