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Background  Surgical outcomes of adolescent idiopathic scoliosis (AIS) patients have been well studied. However, few studies have examined the surgical outcomes of young adult idiopathic scoliosis (YAdIS) patients. This study analyzed and compared the surgical outcomes of young adult (19-30 years) and adolescent (10-18 years) idiopathic scoliosis patients.  Methods  This is a retrospective, comparative two-center study. Reviewed data of consecutive AIS and YAdIS patients who had undergone posterior spinal deformity surgery (n=56) by two spine surgeons from 2010 to 2014. Inclusion criteria were age between 10 to 30 years and preoperative coronal Cobb angle >40 o . We excluded patients with previous correction surgery. Demographic data (age at time of surgery, gender, body mass index (BMI)), surgical data (preoperative diagnosis, number of levels fused, blood loss, duration of surgery, peri- and postoperative complications, duration of surgery, length of stay, revision surgery, and final follow-up) and radiographic data collected, reviewed, and analyzed. The groups were divided as AIS (n=29) and YAdIS (n=27).  Results  Patients’ gender, BMI, average preoperative main coronal curve (YAdIS 53 o  vs. AIS 57 0 ), and follow-up intervals were not statistically different between groups. Statistically significant for YAdIS patients were more levels fused (10.6 vs. 8.9, p=0.02) and more intraoperative blood loss (872 ml vs. 564 ml, p=0.02) were statistically significant. Not significant between the groups were duration of surgery (p>0.05), perioperative complications (p=0.14), and length of stay (p=0.11). At mean 21 months follow-up, patients in both groups had a significant correction of their main coronal curve (YAdIS 21 o  vs. 53 o , p<0.001, and AIS, 19 o  vs. 57 o , p<0.01). YAdIS had a lower percentage correction of their curves (61% vs. 68%, p=0.03). Three YAdIS (11.1%) and no AIS (0%) patients had additional surgery, p=0.07. YAdIS had more distal fusion levels at L4 or below.  Conclusions  YAdIS patients had a greater number of levels fused, higher blood losses, and lower major Cobb correction versus AIS patients.

Clinical Outcomes of Idiopathic Scoliosis Surgery: Is There a Difference Between Young Adult Patients and Adolescent Patients?