Related Experiment Video
Updated: Jun 10, 2026
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.
Purpose:
Traditional surgical interventions for adjacent segment disease (ASD) repair commonly mandate the exposure of all pre-existing hardware. Cortical bone trajectory (CBT) screws have been innovated to amplify the contact surface between the screw and cortical bone, offering a promising approach to mitigate the challenge sassociated with traditional ASD repair surgeries.
Methods:
In this study, a tangible manifestation of the cortical bone trajectory screw navigation guide was produced by utilizing a 3D printer to facilitate the insertion of cortical bone trajectory screws. A comprehensive set of radiographic images and computed tomography scans was gathered to evaluate the accuracy of K-wire through CBT screw guide inside the vertebrae which was previously implanted with a pedicle screw.
Results:
The variance in the K-pin circle centre distance before and after surgery ranges from 0.2 mm to 3.54 mm. The K-pin angle difference falls within the range of 0.4° to 5.8° in the sagittal plane, ranges from 1.46° to 1.7° in the transverse plane.
Conclusion:
This research process has successfully yielded a navigation guide that holds promise for inserting CBT screw even with previously pedicle screw at the same vertebrae.
