Improved CT measurement method in individualized pedicle screw placement
- VernacularTitle:改良CT测量法用于椎弓根螺钉个体化植入的实验研究
- Author:
Wen XIONG
;
Anmin CHEN
;
Fengjin GUO
- Publication Type:Journal Article
- Keywords:
spine;
pedicle screw;
screw implant;
individualized;
enter point
- From:
Orthopedic Journal of China
2006;0(24):-
- CountryChina
- Language:Chinese
-
Abstract:
[Objective]To prove the feasibility of using the distance between sagittal plane of the spinal process and the enter point to individualize the placing of pedicle screw.[Method]Thirty spine specimen were collected and divided into two groups,data were measured,such as the width of the pedicle,distance between the enter point and anterior border of the vertebra,distance between sagittal plane of the spinal process and the enter point,angle from the longitudinal axis of the pedicle to sagittal axis of the vertebra,angle from the longitudinal axis of the pedicle to vertical line of the operating table.In group one the pedicle screws were placed with the help of the distance between sagittal plane of the spinal process and the enter point,the other by the method advised by Ebraheim.CT scan was applied to evaluate the place of the screws,according to the perforation extent,they were classified into 4 grades:A=totally in the pedicle;B=perforation extent4mm.[Result]The individualized group showed much lower perforation rate than the traditional method group in T3~10,and similar in T1,T2,T11,12.[Conclusion]It can obviously improve the accuracy of the pedicle screw placement to use the distance between sagittal plane of the spinal process and the enter point to localize the enter point,especially when anatomic landmark such as articulationes zygapophysiales and transverse process change.
