“…Given advancements in quality and safety, Mehta et al reviewed the rate of unplanned returns to the operating room for patients with adolescent idiopathic scoliosis undergoing spinal fusion and found that this rate decreased 0.46% per year from 1997 to 2013 12 . In a review of patients undergoing posterior spinal fusion, Hughes et al noted continued improvement from 2 to 5 years postoperatively with regard to the rate of coronal imbalance of >2 cm, which decreased from 17% to 6%, and shoulder asymmetry of >2 cm, which decreased from 8% to 1% 13 .…”