Post-approval Registry Study to Evaluate the Continued Safety and Probable Benefit of the MID-C System for 5 Years Post-Implantation in Adolescent Idiopathic Scoliosis (AIS)

Inclusion Criteria: * Adolescent Idiopathic Scoliosis classified as Lenke Type 1 or Type 5 curves; * Cobb angle between 35-60 degrees (inclusive); * Flexible curve that that reduces to ≤ 30 degrees on lateral side-bending radiographs or as evident by traction x-ray; * Kyphosis angles of ≤ 55 degrees measured from T5 to T12; * Appropriate candidate for posterior surgical approach; * Patient has good general health; * Patient has no known hypersensitivity or allergies to titanium; * Patient's guardian signs a written informed consent form (ICF). Exclusion Criteria: * Any type of non-idiopathic scoliosis; * Any main thoracic deformity that includes vertebral levels and cranial including to T2; * Known history of existing malignancy, or any systemic or local infection; * Spinal cord abnormalities that require treatment; * Known neurological deficit (defined as motor grade \< 5/5); * Known poor bone quality defined as T score -1.5 or less; * For female Patient, pregnancy; * Previous spine surgery that would prevent the successful performance of the MID-C system ; * Active systemic disease, such as AIDS, HIV, or active infection; * Active infection or the skin is compromised at the surgical site; * Systemic disease that would affect the Patient's welfare or overall outcome of the study.