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Updated: Jun 10, 2026
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Pedicle Screw Placement Using an Augmented Reality Head-Mounted Display in a Porcine Model
Published on: May 24, 2024
Guide for Navigating 3D-Printed Cortical Bone Trajectory Screws in Situations with Previously Instrumented Pedicle
1Department of Orthopedics Surgery, Bone and Joint Research Center, Chang Gung Memorial Hospital, Chang Gung University, No. 5, Fu-Shin Street, Kweishian, Taoyuan, 333 Taiwan.
Indian Journal of Orthopaedics
|June 9, 2026
Summary
A 3D-printed navigation guide aids in accurately inserting cortical bone trajectory (CBT) screws, even with pre-existing pedicle screws. This innovation improves adjacent segment disease (ASD) repair surgery.
Area of Science:
- Spine Surgery
- Orthopedic Technology
- Biomedical Engineering
Background:
- Traditional adjacent segment disease (ASD) repair often requires removing existing hardware.
- Cortical bone trajectory (CBT) screws offer enhanced fixation by maximizing contact with cortical bone.
Purpose of the Study:
- To develop and evaluate a 3D-printed navigation guide for CBT screw insertion.
- To assess the feasibility of using this guide in vertebrae with pre-existing pedicle screws.
Main Methods:
- A 3D-printed navigation guide was created for CBT screw insertion.
- Radiographic and CT scans were used to evaluate K-wire accuracy through the guide.
- Measurements were taken in vertebrae with prior pedicle screw implantation.
Main Results:
- The K-wire circle center distance variance ranged from 0.2 mm to 3.54 mm.
- Sagittal plane K-wire angle differences were between 0.4° and 5.8°.
- Transverse plane K-wire angle differences ranged from 1.46° to 1.7°.
Conclusions:
- A functional navigation guide for CBT screw insertion was successfully developed.
- The guide demonstrates potential for use in revision surgeries with existing pedicle screws.
- This technology may simplify ASD repair and improve surgical outcomes.
