Non Fusion Surgery in Adolescent Idiopathic Scoliosis Patients

Inclusion Criteria: * Adolescent idiopathic scoliosis ; * Primary Cobb angle greater than 30°; * Failed non-operative treatment defined as progression of the curve greater than 5° per year at any time; * Skeletally immature (Risser grade\* ≤2 and Skeletal age of hand and wrist X-rays ≤14y); * In girl, either pre-menarchal or post-menarchal by no more than 1 year; * Age over 10 years; * Non rigid curve; * All Lenke type; * No previous spine surgery. Exclusion Criteria: * Non-idiopathic scoliosis: musculoskeletal or neurologic conditions responsible for cause of the spine curvature (i.e. neuromuscular, congenital or syndromic scoliosis); * History of previous spine surgery; * Risser sign \>2; * Disease or deformity likely to affect the stability of the device (i.e. inadequate anatomy of pedicles, trauma or tumor in fixation region, severe osteoporosis, bone destruction or poor bone quality); * Non-reductible scoliosis; * Known allergy or intolerance to one of the device material; * Acute or chronic infections, local or systemic; * Absence or insufficience of covering tissues; * Pathological obesity.