数字化导航模板在下颈椎椎弓根定位定向中的应用

Application of digital navigation template to lower cervical pedicle stereotaxy

目的探讨数字化导航模板辅助下颈椎椎弓根螺钉置入的可行性和准确性。方法采集15例下颈椎脱位患者的术前CT资料,利用逆向工程原理和快速成型技术制造出数字化导航模板,术中通过导航模板辅助颈椎椎弓根螺钉的置入。术后根据X片和CT扫描评价椎弓根螺钉位置。结果共设计制作54个导航模板,辅助置入108枚颈椎椎弓根螺钉,CT扫描发现所有螺钉均准确置入相应椎弓根内。结论数字化导航模板辅助下颈椎椎弓根螺钉置钉准确性高,操作简单,为下颈椎椎弓根螺钉的准确置入提供了一种新方法 。

Objective To explore the accuracy and feasibility of pedicle screw placement in lower cervical vertebraes assisted by digital navigation template.Methods The preoperative CT data of 15 patients with the lower dislocation of cervical vertebra were applied to design and generate a digital navigation template by using reverse engineering and rapid prototyping.Then the templates were used to guide cervical pedicle screw placement during operation.After this,X-ray and CT scan were performed to evaluate the screw orientation associated with the pedicle axis.Results 108 cervical pedicle screws assisted by 54 digital navigation templates were placed in lower cervical vertebras.CT scan findings showed all screws were accurately nailed into the corresponding pedicles.Conclusion Pedicle screw placement assisted by digital navigation templates is highly accurate and simple.It is a new alternative to lower cervical pedicle stereotaxy.