In order to stereoscopically evaluate scoliosis, three-dimensional analysis of the deformity was carried out. Top views of the spine were obtained by stereoscopic AP and lateral radiographs. A new progressive factor was three-dimensionally established, and prediction of the progression of scoliotic deformity with juvenile and adolescent idiopathic scoliosis was carried out. These top views were divided into 5 groups by the order of its progressive risk degree according to the progressive standard of scoliotic deformity that we established. Progression of scoliotic angle in all cases in 2 groups with high progressive risk degree of scoliotic deformity was confirmed. It was considered that progressive scoliotic deformity may be further accurately predicted by evaluation of a new progressive factor that was obtained by analysis of top views in addition to studying progressive factors revealed by AP and lateral radiographs because this top view of the scoliotic deformity had not been previously studied.