The accuracy of a novel pedicle screw insertion technique assisted by a special angular scale in the subaxial cervical spine using lateral mass as a reference marker

摘要

The ideal pedicle trajectory was defined as a line passing through the centre of the pedicle on the transverse and sagittal CT images (left column). The three-dimensional cervical model was reconstructed using cervical spine transverse CT images. On the three-dimensional reconstructed cervical model, the ideal pedicle trajectory would penetrate the posterior surface of the lateral mass, and this point was then identified as the optimal entry point passing through the centre of the pedicle (right column)