Coronal deformity angular ratio may serve as a valuable parameter to predict in-brace correction in patients with adolescent idiopathic scoliosis

In-brace correction (IBC) plays an important role in curve progression of patients with adolescent idiopathic scoliosis (AIS) under brace treatment. We evaluated the coronal deformity angular ratio (C-DAR) as a potential predictor of IBC. Based on our experience, we postulated that a high C-DAR may result in low IBC. This relationship had not been previously studied. To evaluate the relationship of C-DAR and IBC in patients with AIS. A retrospective study. A total of 119 patients with AIS treated with a Gensingen brace in our scoliosis center from July 2015 to October 2017 were included. In-brace correction. Data were collected before and upon brace placement. Correlation analyses between study variables and IBC were performed. A linear regression model was established on the basis of C-DAR. At brace fitting, the average age was 12.62±1.16 (range, 10–15) years and mean major curve Cobb angle was 32.14±4.66° (range, 25–40°). Mean IBC was 59.62%±22.03% (range, 16.2–100%). IBC had significant correlation with C-DAR (r=−0.69; 95% confidence interval, −0.77 to −0.61; p