Adolescent Idiopathic Scoliosis represents a rare condition with a potentially detrimental impact on young patients. Optimal therapeutic choice is still controversial. Early surgery – benefits deformity correction, benefits physically and Psychologically but Controversy is High risk complications, scarcity of documented subjective long-term outcome. It is a 3 D spinal deformity, Potential long term physical and psychological impaction on patients. Surgical decision is based on Individual patient's disease characteristics, curve type, Risk factors for progression, Subjective expectations. Question is Why surgery? The natural history of Adolescent Idiopathic Scoliosis is undesirable, deformity may worsen Surgery alters this natural history in a favourable and reproducible manner, now a days Complications are minimal Long-term side-effects of surgery are not detrimental, so that the risk-benefit ratio favors the surgery over the condition's natural history.