Abstract:

Objective 　To investigate the feasibility of anterior occiput to axis transarticular locking plate system through analyzing its compatibility with the occipital cervical complex.　Methods　Thirty health cases were selected from the date of head-neck CT examination randomly. 3D models of occipital cervical complex were reconstructed on the date. The anatomical compatibility was assessed between the systems and the 30 cases through surgical simulation by computer via digital technology. The  morphological compatibility between the titanium plate and the surface of the axis as well as the screw trajectory were observed. The ideal screw trajectory parameters of trans-articular screws were measured so that the compatibility could be assessed.　Results　 There was a morphological match between the titanium plate and the surface of the axis. All the trans-articular screws passed through the atlanto-occipital articulation and the atlanto-axial articulation, without piercing the bones or going into the hypoglossal canal. The fixed screws were in the axial vertebral body without going into the intervertebral space and the spinal canal. There was no significant difference between the ideal screw trajectory and the actual screw trajectory.　Conclusions　Anterior occiput to axis transarticular locking plate system has a better anatomic compatibility with the Chinese occipital cervical complex. And it is feasible in clinical application.

Key words: Anterior, Atlantooccipital joint, Atlantoaxial joint, Occipitocervical fusion, Transarticular screw, Compatibility