[Idiopathic scoliosis in adolescence. Incidence and progression of untreated scoliosis].

Decision making in adolescent idiopathic scoliosis (AIS) requires a thorough knowledge of the natural history. Treatment decisions must be individualized based on the probabilities of progression. Any treatment for AIS must influence the "natural history" in a positive way. The natural history of AIS with reference to back pain, effects on pulmonary function, psychosocial effects, mortality, effect on pregnancy and risks of progression in the immature and mature patient are presented.