I was told its uncommon for a woman of 20 years of age to have scoliosis surgery is this true or is it because there would be more complications?

Scoliosis: This is true. Scoliosis surgery is typically not done unless the degree of curvature is high. There is a misconception that scoliosis always causes pain, but in actuality most patients with a mild scoliosis have no pain and have normal lives. If you have pain, it is likely due to benign causes such as soft tissue inflammation/deconditioning, and conservative treatment should help.