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Table 2 Classification of screw insertion

From: Patient-specific drill template for C2 transoral pedicle insertion in complete reduction of atlantoaxial dislocation: cadaveric efficacy and accuracy assessments

Grade PDT group Freehand group
Type I 8 (80%) 5 (50%)
Type II 2 (20%) 3 (30%)
Type III 0 2 (20%)