GDF2 and scoliosis: One year after PVCR, Pearson correlation analysis showed that serum levels of BMP2 and BMP9 in patients with scoliosis were positively correlated with ODI scores (r = 0.778, P < 0.001; r = 0.746, P < 0.001), SRS-22 scores (r = 0.758, P < 0.001; r = 0.722, P < 0.001), and Cobb angle correction rate (r = 0.838, P < 0.001; r = 0.802, P < 0.001).