Placement of pedicle screws undex X-ray fluoroscopy step by step in cadaveric thoracolumbar spine
- VernacularTitle:X线分步监测胸腰椎椎弓根螺钉植入的实验研究
- Author:
Genlin WANG
;
Huilin YANG
;
Xin CAI
- Publication Type:Journal Article
- Keywords:
thoracolumbar spine;
pedicle screw;
fluoroscopy;
X-ray
- From:
Orthopedic Journal of China
2006;0(13):-
- CountryChina
- Language:Chinese
-
Abstract:
[Objective]To investigate the feasibility of the placement of pedicle screws in the thoracolumbar vertebrae under X-ray fluoroscopy step by step.[Method]Eight human cadaveric thoracolumbar spines(T9~L5) were selected and classified into group A and group B randomly,each having 4 specimens.Pedicle screws in group A were placed under X-ray fluoroscopy step by step.CT scanned the specimens of group A and measured the half pedicle length,full pedicle length and the pedicle screw passage length.The "e" angle and "f" angle of pedicle were measured on CT images.When the guide wire was pricked to the half of pedicle length,the wire tip was located at the middle line of the pedicle projection in the standard posterior-anterior image.When the wire was pricked to the full pedicle length in lumbar vertebrae,its tip was located at 3/4 line of the pedicle projection in the standard posterior-anterior image.When the wire was pricked to the full pedicle length in thoracic vertebrae,its tip was located at between 1/2 line and 3/4 line of the pedicle projection.When the wire was pricked into vertebrae,the depth of the wire and the "e" angle were noted in standard lateral image.Pedicle screws were placed by the track of the guide wire.Pedicle screws in group B were placed by traditional technique.The accuracy and feasibility of the method under X-ray fluoroscopy step by step were evaluated by observation of the position of the pedicle screws in group A and group B.[Result] Four of 72(5.56%) pedicle screws were found to have perforated the pedicle wall in group A,and 19 of 72(26.38%) pedicle screws perforated the pedicle wall in group B.The result of group A was superior to that of group B(P
