Related Experiment Video
Updated: Aug 27, 2026
A Spine Robotic-Assisted Navigation System for Pedicle Screw Placement
Published on: May 11, 2020
Robotic-Assisted Cervical Pedicle Screw Placement With Uniform 5.5 mm Rods Crossing the Cervicothoracic Junction:
Vidyadhara Srinivasa1,2, Abhishek Soni1, Balamurugan Thirugnanam1
1Manipal Institute of Robotic Spine Surgery, Manipal Comprehensive Spine Care Center, Manipal Hospital, Bangalore, Karnataka.
Study Design:
Retrospective case series.
Objective:
To evaluate the accuracy and safety of robotic-assisted cervical pedicle screw placement using the SpineVidya C-TEK system with uniform 5.5 mm rods across the cervicothoracic junction.
Summary Of Background Data:
The cervicothoracic junction (CTJ) represents a biomechanical transition zone where traditional cervical constructs require rod diameter transitions, introducing mechanical weakness. The C-TEK system features an enlarged tulip design accommodating 5.5 mm rods with 4.0 mm diameter cervical pedicle screws, eliminating the need for tapered rods or connectors at the CTJ.
Methods:
Twenty-six consecutive patients (282 screws) underwent robotic-assisted C-TEK cervical pedicle screw placement crossing the CTJ between April 2024 and June 2025. All procedures utilized the MazorX Stealth Edition robotic system with O-arm intraoperative CT imaging. Two blinded observers assessed screw accuracy using the Gertzbein-Robbins classification. Clinical outcomes and complications were evaluated.
Results:
Mean age was 54.1 years. In this preliminary series, all 282 screws achieved clinically acceptable placement (grades A-B; 100% in this cohort). Perfect placement (grade A) was achieved in 276 screws (97.9%), with grade B breach in 6 screws (2.1%). No grade C, D, or E breaches occurred. At the cervicothoracic junction levels (C7, T1, T2), 78 screws maintained clinically acceptable accuracy. Interobserver reliability was excellent (κ=0.94). No vertebral artery injuries, permanent neurological deficits, or hardware failures occurred. Illustrative cases demonstrated feasibility across diverse pathologies including dropped head syndrome, dystrophic scoliosis, and revision scenarios.
Conclusions:
Robotic-assisted C-TEK cervical pedicle screw placement demonstrates high accuracy and technical feasibility for uniform 5.5 mm rod constructs crossing the CTJ without rod diameter transitions or connectors. These preliminary results from a single-center experience support further investigation, including comparative studies with traditional dual-diameter systems.
Level Of Evidence:
Level IV.
