|
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
|
- *Group A, bilateral apical vertebral derotation by VCM; Group B, VCA.