Initial Cobb angle reduction velocity following bracing as a new predictor for curve progression in adolescent idiopathic scoliosis.

Purpose The initial correction rate (ICR) has been widely used as a predictor for curve progression in adolescent idiopathic scoliosis (AIS) undergoing bracing treatment. We proposed a new parameter, the initial Cobb angle reduction velocity (ARV), for prediction of curve progression. The purpose of this study was to identify whether the initial ARV was a more effective predictor than ICR for curve progression in AIS patients undergoing brace treatment, and to evaluate the ideal cut-off point of initial ARV for prediction of curve progression.