Fig. 4

A. Standing PA of a 18-year-old adolescent female. The structural lumbar curve was 71° before surgery. a Preoperative T curve was 36°, reduced to 24° at bending film. b The postoperative thoracic curve was corrected to 14° and thoracolumbar curve was corrected to 15° at 3 months after surgery. c At 2-year follow-up, the main thoracolumbar curve was 13° and the thoracic curve was 13°. d The preoperative sagittal alignment showed a large TIA (75°) and GTK (48°). PJA was 13° and TK was 35°. e The GTK increased to 51°, with PJA increased to 26° and TK decreased to 31° at first follow-up. f At 2-year follow-up, GTK increased to 56°, TK increased to 37° and PJA increased to 32°; 19 degrees of increasing PJK angle was measured. TIA remained stable