[Feasibility of a novel type of complex anterior cervical fixation by using Mimics software]

To investigate the feasibility of mimics software in analyzing a new type of complex anterior cervical fixation -- anterior transpedicular screw fixation+zero notch internal fixation.

From January 2021 to September 2022, 50 normal pedestrians who underwent cervical spine CT scanning were selected for C₁-C₇ segment scanning, including 27 males and 23 females, aged from 25 to 65 years old with an average of (46.0 ± 9.0) years old. The dicom format is exported and engraved into the CD, and use the mimics software to perform 3D reconstruction of each segment. A simulated screw is placed on the image according to the critical value of zero notch screw (head and tail angle 44°, internal angle 29°). The position of zero notch screw in each segment is observed to determine the feasibility of anterior transpedicular screw fixation plus zero notch internal fixation.

For the upper zero notch screws the three-dimensional images of the cervical spine across all 50 subjects within the C₃-C₇ segments demonstrated safe position, with no instances of intersection with ATPS. For the lower zero notch screw, in C₃-C₄ and C₄-C₅, 4 out of 50 subjects are in the safe position in the three-dimensional images of cervical vertebrae, and 46 cases could achieve secure screw placement when the maximum caudal angle is(32.3±1.9) ° and (36.1±2.2) °, respectively. In C₅-C₆ and C₆-C₇ segments, no lower zero notch screws intersected with ATPS, and all screws are in safe positions.

Lower cervical anterior pedicle screw fixation plus zero notch internal fixation can achieve successful nail placement through the selected entry point and position.