2.6. Determination of the ideal screw trajectory
This protocol is extracted from research article:
Anatomical study of the ideal cortical bone trajectory in the lumbar spine
Medicine (Baltimore), Jan 15, 2021; DOI: 10.1097/MD.0000000000024099

After simulating the screw placement, the relevant parameters of the screw trajectory were recorded and analyzed statistically. Under the premise of safety and feasibility, we considered a placement rate ≥85% as the basic condition for the ideal screw trajectory. The coupling capacity was the main reference for determining the ideal screw trajectory. Based on a comprehensive analysis of the primary and secondary relationships among the ideal screw trajectory length, screw length and coupling capacity, and between the screw placement angle and clinical operability, the ideal screw trajectory was finally selected. Finally, the CBT screw entry point for each lumbar segment was deduced according to the optimal screw trajectory. The location of the screw entry point is described according to the relation between the location of the entry point and the dorsal anatomical landmarks of the vertebral body.

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