Rapid prototype patient-specific drill template for cervical pedicle screw placement
Rapid prototype patient-specific drill template for cervical pedicle screw placement
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DOI：
10.3109/10929080701662826
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发表时间：
2007-01
影响因子：
--
通讯作者：
B. D. Owen;G. Christensen;J. Reinhardt;T. Ryken
中科院分区：
文献类型：
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作者：
B. D. Owen;G. Christensen;J. Reinhardt;T. Ryken
目的：评价钻孔模板在单椎体节段置入颈椎椎弓根螺钉的可行性和准确性。材料和方法：对尸体颈椎进行容积CT扫描。使用计算机软件，构建具有预定义轨迹的钻孔模板，该钻孔模板被设计为匹配第五颈椎右侧的后表面。使用快速成型机从计算机模型创建物理模板。钻头模板用于引导钻取导向孔，并进行CT扫描以评估该孔的准确性。将直径为3.5 mm的椎弓根螺钉置入导向孔中。然后解剖脊柱以分离椎骨，并目视检查螺钉的轨迹。结果：证明了这种患者特异性快速成型技术的可行性。影像学检查和目视检查证实了定位孔和颈椎椎弓根螺钉的准确放置，未侵犯皮质。结论：使用钻孔模板置入颈椎椎弓根螺钉是有前景的。我们最初的方法似乎为颈椎椎弓根螺钉置入提供了准确的技术和轨迹。
Objective: To assess the feasibility and accuracy of a drill template for the placement of a cervical pedicle screw in a single vertebral level. Materials and Methods: A volumetric CT scan was performed on a cadaver cervical spine. Using computer software, a drill template with a predefined trajectory was constructed that was designed to match the posterior surface of the right side of the fifth cervical vertebra. A physical template was created from the computer model using a rapid prototyping machine. The drill template was used to guide drilling of a pilot hole, and a CT scan was performed to assess the accuracy of this hole. A 3.5-mm diameter pedicle screw was placed in the pilot hole. The spine was then dissected to separate the vertebrae and the trajectory of the screw was visually inspected. Results: The feasibility of this patient-specific rapid prototyping technique was demonstrated. Imaging and visual inspection confirmed accurate placement of the pilot hole and cervical pedicle screw without cortical violation. Conclusions: The potential use of drill templates to place cervical pedicle screws is promising. Our initial methodology appears to provide an accurate technique and trajectory for pedicle screw placement in the cervical spine.