This study work finds out the effect of interphase force application and balance in Boston brace on adolescent idiopathic scoliosis.Regarding Scoliosis Research Society(SRS), International Research Society of Spinal Deformity(IRSSD) and Socity on Scoliosis Orthopedic and Rehabilitation Treatment criteria (SOSORT) better results are found in this work. However the finding in this study about the effect of Boston brace in Adolescent idiopathic scoliosis cannot be generalized as study has been conducted in one center only and it was a short term study.