Comparison of the accuracy of cervical pedicle screw placement between individual navigational template and free hand placement
WANG Qingde
MEI Wei
ZHANG Zhenhui
JIANG Wentao
CHEN Xuyi
Abstract：Objective To compare the accuracy between cervical pedicle screw placement assisted by the individual navigation template and free hand pedicle screw placement.Methods Eight adult cadavers (4 male and 4 famale) were randomly divided into two groups: individual navigation template group and free hand pedicle screw placement group.The cadaver cervical specimens (C3-7) of the individual navigation template group were scanned by CT and the 3D model was reestablished.According to the morphological feature of the posterior cervical spine elements, the reverse template was designed.Then, the best pedicle screw channels were fused into bilateral navigation template.The navigation template was manufactured by rapid prototyping technology.Cervical pedicle screws were inserted with the assistance of navigation templates.Patients in the free hand pedicle screw placement group were treated with Abumi pedicle entrance method.Postoperative X-ray and CT scanning were used to evaluate the accuracy of screw placement.Results A total of 32 pedicle screws were implanted in the individual navigation template group, 31 screws were placed entirely within the pedicle (grade Ⅰ), 1 screw perforated the medial cortex of pedicle (grade Ⅱ), and the accuracy of screw placement was 96.8%.A total of 32 pedicle screws were implanted in the free hand pedicle screw placement group, 29 screws were placed entirely within the pedicle (grade Ⅰ), 3 screws perforated the medial cortex of pedicle (grade Ⅱ) and the accuracy of screw placement was 90.6%.The accuracy of screw placement of the individual navigation template group was higher than that of the free hand pedicle screw placement group (P<0.05).Conclusion The individual navigation template-assist pedicle screw placement has a higher accuracy than the free hand pedicle screw placement.
Keywords：cervical vertebrapedicle screw placementcomputer navigation systemindividual design
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：3( 5-7 )