PMS Evaluation of Safety and Efficacy of the MID-C System 5 Years Post-implantation in AIS

Inclusion Criteria: 1\. Adolescent Idiopathic Scoliosis classified as Lenke Type 1 or Type 5 curves; 2. * Patients with Risser stage 0-1, primary Cobb angle between 35-50 degrees (inclusive), or * Patients with Risser stage 0-1 and good brace compliant but curve progression above 6°, or * Patients with Risser stage 0-1 that are non-compliant with brace treatment and primary Cobb angle between 30-50 degrees or * Patients with Risser stage 2, primary Cobb angle between 40-50 degrees (inclusive) 3. Flexible curve that that reduces to ≤ 30 degrees on lateral side-bending radiographs or as evident by traction x-ray; 4. Kyphosis angles of ≤ 45 degrees measured from T5 to T12; 5. Appropriate candidate for posterior surgical approach; 6. Patient has good general health; 7. Patient has no known hypersensitivity or allergies to titanium; 8. Patient's guardian signs a written informed consent form (ICF). Exclusion Criteria: 1. Any type of non-idiopathic scoliosis; 2. Any main thoracic deformity that includes vertebral levels and cranial including to T2; 3. Cumulative vertebral wedging over the apex of the curve\>15º 4. Known history of existing malignancy, or any systemic or local infection; 5. Spinal cord abnormalities that require treatment; 6. Known neurological deficit (defined as motor grades \< 5/5); 7. Known poor bone quality defined as T score -1.5 or less; 8. Previous spine surgery that would prevent the successful performance of the MID-C system; 9. Active systemic disease, such as AIDS, HIV, or active infection; 10. Active infection or the skin is compromised at the surgical site; and 11. Systemic disease that would affect the patient's welfare or overall outcome of the study