This study aims to investigate the effects of a core stabilization-based rehabilitation program following adolescent idiopathic scoliosis (AIS) surgery on radiological parameters, pain, upper extremity function, range of motion, and scapular assessment. Participants diagnosed with AIS and treated with posterior spinal fusion surgery will undergo a rehabilitation program based on core stabilization exercises. Outcome measures will include Cobb angle, vertebral rotation, Visual Analog Scale (VAS), QuickDASH, Trunk Appearance Perception Scale (TAPS), SRS-22, cervical and shoulder range of motion, and scapular assessment tests. Assessments will be conducted before and after the rehabilitation program.