[Fabrication and application in vitro of pedicle guide device for pedicle screws insertion].
OBJECTIVE
To evaluate the accuracy of pedicle guide device for the placement of the pedicle screws.


METHODS
Pedicle guide device was designed and made for the anatomical trait of pedicle. The 3-D anatomical data of the thoracic pedicles were measured by multi-slice spiral CT in two embalmed human cadaveric thoracic pedicles spine (T1-T10). Depending on transverse section angle (TSA) and sagittal section angle (SSA) of pedicle axis, the degree of horizontal dial and sagittal dial were adjusted in the guide device. The screws were inserted bilaterally in the thoracic pedicles by using the device. After pulling the screws out, the pathways were filled with contrast media. The TSA and SSA of developed pathways were measured.


RESULTS
Analysis of the difference between pedicle axis and developed pathway was of no statistical significance (P > 0.05).


CONCLUSIONS
The guide device could be easily operated and guarantee high accuracy of the pathways of screws and the incidence of pedicle penetration could be significantly reduced.
Hu
Ning
N
Department of Orthopaedics, Tongji Hospital, Wuhan Hubei, 430030 PR China.
Fang
Huang
H
Luo
Yongxiang
Y
Wang
Juan
J
D000328:Adult; D001863:Bone Screws; D002102:Cadaver; D004867:Equipment Design; D005593:Fracture Fixation, Internal / Q000295:instrumentation* / Q000379:methods*; D006801:Humans; D013904:Thoracic Vertebrae / Q000000981:diagnostic imaging / Q000601:surgery*; D036542:Tomography, Spiral Computed