Preoperative "Cervical Axis" Deviation Increases the Risk of Distal Adding-On Following Surgery in Lenke 1 and 2 Adolescent Idiopathic Scoliosis Patients.

found that distal adding-on could be related to PSI, but this association did not reach statistical significance. 19 Zhang et al noticed that distal adding-on had high occurrence among patients with PSI (OR 8.5, 95% CI 1.6-46.1). 28 Yang et al. also noted less shoulder imbalance in patients with adding-on. 1 Qin et al. reported that higher postoperative left shoulders increased the risk of adding-on progression. 29 Our study concluded that there was no significant association and differences between PSI and distal adding-on phenomenon ( P > 0.05).

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