Bilateral apical vertebral derotation technique by vertebral column manipulation compared with vertebral coplanar alignment technique in the correction of lenke type 1 idiopathic scoliosis

Table 2 Surgery details

	Group A*	Group B*
Instrumented level (N ± SD)	12.1±1.5	11.8±1.8
Implant density (% ± SD)	55.7±5.6	53.8±8.3
Operation time (min ± SD)	157±54	168±65
Intraoperative blood loss (ml ± SD)	664±269	687±248