Several things... Surgery for adolescent idiopathic scoliosis usually involves fusion of the curved parts of the spine with screws and rods. You can expect pain for a few days after surgery. You will have improved appearance with a straighter spine and improved posture. Surgery for adult scoliosis will results in less back pain and decreased pain radiating into the lower extremities.
Straightening! Scoliosis surgery is designed to straighten the spine. Depending on the magnitude of the curve, you may gain an inch or two in height! as far as the surgery itself, advances in modern technology such as ct navigation, neuromonitoring and topical antibiotics have made the surgery much safer. You may need a blood transfusion. Speak to your doctor about institution experience.