Scholarlink

Purpose <p>3D-printed patient-specific guides enable accurate pedicle screw placement in the treatment of paediatric spinal deformities. MRI-based synthetic CT (sCT) eliminates the radiation exposure associated with the preoperative planning CT, while still providing detailed bony morphology. It may therefore offer a radiation-free method for pedicle screw navigation. Thus, the aim of this study was to compare the accuracy of thoracic and lumbar pedicle screw placement using 3D-printed guides based on conventional CT <i>versus</i> sCT.</p> Methods <p>Full-spine MRI and CT images of four human cadaveric spines were obtained, followed by AI-generation of sCTs, the digital planning of pedicle screws and 3D-printed guide manufacturing. A total of 62&#xa0;K-wires were inserted, 30 sCT-based and 32 CT-based. Accuracy was evaluated by superimpose analysis of planned and achieved trajectories, and by the postoperative grading of the cortical breach rate using the Gertzbein-Robbins classification, based on projected screws along the K-wires.</p> Results <p>Median translational entry-point deviations were 1.0&#xa0;mm vertically and 0.5&#xa0;mm horizontally for both sCT-based guides and CT-based guides. Angular deviations in the axial plane were 1.0˚ for sCT and 0.9˚ for CT. In the sagittal plane these were 1.8˚ and 2.1˚, respectively. No significant differences were observed between sCT and CT. Grading of pedicle’s cortical breach showed no severe malposition for both sCT- and CT-based guides.</p> Conclusion <p>sCT matched the accuracy of conventional CT in providing source data for personalized 3D-printed guides for thoracic and lumbar pedicle screw placement in terms of translational- and angular deviations, and cortical breach rates in this cadaveric study.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

CT vs. MRI-based synthetic CT: accuracy of thoracic and lumbar pedicle screw placement using 3D-printed guides

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月2日

查看全文
  • Jules Cool,
  • Peter P. G. Lafranca,
  • Joëll Magré,
  • Johannes G. G. Dobbe,
  • Moyo C. Kruyt,
  • Geert J. Streekstra,
  • Tom P. C. Schlösser,
  • Barend J. van Royen

摘要

Purpose

3D-printed patient-specific guides enable accurate pedicle screw placement in the treatment of paediatric spinal deformities. MRI-based synthetic CT (sCT) eliminates the radiation exposure associated with the preoperative planning CT, while still providing detailed bony morphology. It may therefore offer a radiation-free method for pedicle screw navigation. Thus, the aim of this study was to compare the accuracy of thoracic and lumbar pedicle screw placement using 3D-printed guides based on conventional CT versus sCT.

Methods

Full-spine MRI and CT images of four human cadaveric spines were obtained, followed by AI-generation of sCTs, the digital planning of pedicle screws and 3D-printed guide manufacturing. A total of 62 K-wires were inserted, 30 sCT-based and 32 CT-based. Accuracy was evaluated by superimpose analysis of planned and achieved trajectories, and by the postoperative grading of the cortical breach rate using the Gertzbein-Robbins classification, based on projected screws along the K-wires.

Results

Median translational entry-point deviations were 1.0 mm vertically and 0.5 mm horizontally for both sCT-based guides and CT-based guides. Angular deviations in the axial plane were 1.0˚ for sCT and 0.9˚ for CT. In the sagittal plane these were 1.8˚ and 2.1˚, respectively. No significant differences were observed between sCT and CT. Grading of pedicle’s cortical breach showed no severe malposition for both sCT- and CT-based guides.

Conclusion

sCT matched the accuracy of conventional CT in providing source data for personalized 3D-printed guides for thoracic and lumbar pedicle screw placement in terms of translational- and angular deviations, and cortical breach rates in this cadaveric study.