Idiopathic scoliosis is the most common type of scoliosis in the adolescent population. It is an exclusionary diagnosis. The natural course of idiopathic scoliosis varies widely among patients and depends on age of onset, age at menarche, curvature type, scoliosis Cobb angle, and skeletal maturity. These factors determine the risk of progression of scoliosis in patients with AIS. Scoliosis presents as a complex three-dimensional deformity in the coronal, sagittal and axial planes. There are several staging systems for idiopathic scoliosis, with the Lenke staging being the most commonly used staging. The Lenke staging has 3 main components: curvilinear, lumbar modified, and sagittal modified. This new typing system is designed to define all types of deformities. To classify spinal deformities using the Lenke typing, 4 types of radiographs are essential: standing coronal and sagittal radiographs and left and right flexion radiographs. This typing divides scoliosis into 6 types and further subdivides them using the lumbar correction and sagittal correction types. Thus, the Lenke typing provides a reliable classification of idiopathic scoliosis and also suggests a corresponding treatment strategy.