Abstract: Objective To explore the relationship between the coronal plane parameters of trunk and Cobb angle of adolescent idiopathic scoliosis (AIS), for the purpose of providing assistance for early screening and monitoring of conservative treatment of AIS. 
Methods Forty-three AIS patients with unilateral right thoracic or left lumbar “C”-shaped curvature admitted to Department of Rehabilitation Engineering of Xuzhou Rehabilitation Hospital were selected, including 20 patients with right thoracic curvature and 23 patients with left lumbar curvature. The Cobb angle on the full length of spine X-ray, the apex vertebral translocation (AVT), trunk shift (TS), trunk shift ratio (TSR) and apex trunk rotation (ATR) degree of vertebral body in physical appearance were measured. The correlations between the AVT, TS, TSR, ATR and Cobb angle were analyzed respectively. 
Results The AVT and TSR were significantly correlated with Cobb angle, the AVT was better correlated with Cobb angle (r=0.749, P＜0.05), and the correlation between AVT, TSR and Cobb angle was greater in patients with left lumbar curvature than in patients with right thoracic curvature. There was no correlation between ATR and Cobb angle in patients with left lumbar curvature (P＞0.05). 
Conclusion There is a certain correlation between the coronal plane parameters of trunk and the Cobb angle in patients with unilateral right thoracic or left lumbar “C”-shaped curvature in AIS patients. 

Key words: scoliosis, Cobb angle, adolescent ,