Comparision of interval and consecutive pedicle screw placement for Lenke 1 adolescent idiopathic scoliosis

English Keywords:Adolescent idiopathic scoliosis  Consecutive pedicle screw placement  Interval pedicle screw placement

English Abstract:

  【Abstract】 Objective：To compare the clinical efficacy of the interval and consecutive pedicle screw placement for Lenke 1 adolescent idiopathic scoliosis（AIS）.Method：Thirty-two patients with Lenke 1 AIS were randomly divided into two groups.In group 1，posterior fusion was performed using consecutive pedicle screw placement on the correction side，and in group 2，interval pedicle screw placement was performed on the correction side.The following variables including pre- and post-operative sagittal and coronal Cobb angle and sciliosis correction rate were observed.Result：No neurologic deficit related to surgery was presented in both groups.Cobb angle of major curve decreased significantly from 62.7°±12.7° of preoperative to 14.5°±6.8° of postoperative and from 63.9°±10.9°of preoperative to 14.7°±6.4° of postoperative for the consecutive and interval pedicle screw placement group respectively.Thoracic sagittal Cobb angle decreased significantly from 28.3°±11.6° of preoperative to 20.5°±10.7° of postoperative and from 28.1°±10.8° of preoperative to 21.0°±10.3° of postoperative for the consecutive and interval pedicle screw placement group respectively.Global sagittal imbalance decreased significantly from -3.3±6.1cm of preoperative to 1.4±3.3cm of postoperative and from -4.4±4.8cm of preoperative to 0.9±3.0cm of postoperative for the consecutive and interval group respectively.There were no differences between two groups with respect to any postoperative parameters.Conclusion：Either interval or consecutive pedicle screw placement has equal correction effect for Lenke 1 AIS.