Patient description: The patient is a 14-year-old boy complaining of scoliosis and back pain. He has no other medical condition. He used to be able to play routine activities such as basketball and soccer, however, he recently has problem doing them. The pain is in his leg and back and aggravated by physical activities. He prefer lying down most of the time. He is not happy with his body gesture and complaints of shoulder imbalance and shifting his head to right. Patient is a well-dressed and well-nourished adolescent who is alert and cooperative. The left shoulder is slightly higher than the right shoulder. The scoliotic curve is measured as 45 degree. The patients is candidate for scoliosis surgery according to perioperative MEP monitoring

Clinical trial eligibility criteria: eligible ages (years): 11.0-21.0,  Adolescent Idiopathic Scoliosis Diagnosis of Adolescent Idiopathic Scoliosis (AIS) with no associated syndrome requiring surgical treatment for selective thoracic/lumbar fusion with a minimum of five (5) instrumented vertebrae between T1-S1 as confirmed by patient history and radiographic studies. AIS cases must be classified as a Lenke type 1 or type 2 curve. No cervical vertebrae are to be incorporated into the construct. 2. Willingness and ability to comply with the requirements of the protocol including follow-up requirements. 3. Willing and able to sign a study specific informed consent form or, in the case of a patient who is a minor, provide assent and the minor patient's parent/legal guardian provides written consent to participate. 4. Age range of ≥ 11 years old and ≤ 21 years old at time of surgery  Previous anterior or posterior spine surgery at the index levels. 2. Previous posterior spine surgery (e.g., posterior element decompression) that destabilizes the cervical/thoracic/lumbar spine. 3. Active systemic infection or infection at the operative site. 4. Any sign of any spinal dysrhaphism (any cord abnormality). 5. Co-morbid medical conditions of the spine or upper/lower extremities that may affect the thoracic or lumbar spine neurological and/or pain assessment. 6. Metabolic bone disease such as osteoporosis that contradicts spinal surgery. 7. History of an osteoporotic fracture. 8. History of an endocrine or metabolic disorder (e.g., Paget's disease) known to affect bone and mineral metabolism. 9. Taking medications that may interfere with bony/soft tissue healing including chronic oral steroid use. 10. Known allergy to titanium or cobalt chrome. 11. Rheumatoid arthritis or other autoimmune disease or a systemic disorder such as HIV, active hepatitis B or C or fibromyalgia. 12. Insulin-dependent type 1 or type 2 diabetes. 13. Medical condition (e.g., unstable cardiac disease, cancer) that may result in patient death or have an effect on outcomes prior to study completion. 14. Pregnant, or intend to become pregnant, during the course of the study. 15. Severe obesity (Body Mass Index > 40). 16. Physical or mental condition (e.g., psychiatric disorder, senile dementia, Alzheimer's disease, alcohol or drug addiction) that would interfere with patient self-assessment of function, pain or quality of life. 17. Incarcerated at the time of study enrollment. 18. Current participation in an investigational study that may impact study outcomes