ArticleIndian journal of orthopaedics2026
Guide for Navigating 3D-Printed Cortical Bone Trajectory Screws in Situations with Previously Instrumented Pedicle Screws.
Article in Indian journal of orthopaedics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
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.
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