Rabbit Spinal MRI Features After Ligation Posterior Vascular Plexus Of Atlantoaxial Joint And Lateral Atlantoaxial Joint Radiographic Measurements

Objective:To evaluate theoretical feasibility that the posterior midline approach oncerelease, reset, fixation and fusion atlantoaxial joint treatment of irreducible atlantoaxial dislocation.Methods:1.By magnetic resonance imaging (MRI) for preoperative and postoperative experimental animals all the time on the atlas edge to edge of atlanto-axial spinal cord scanning, measuring the size of each period of spinal cord and sagittal T1WI, T2WI in the image relative signal strength, and each time the measurement data were analyzed.2. According to the March2012-line neck CT angiography in March2013and is in line with the criteria for the scan data of227patients, the vertebral artery of atlanto-axial joint under the joint face contorts and variation, atlas on the bony structure, posterior atlanto-axial joint facial bony structure of3d measurement and analysis.Result:1. Experimental animals before the time of spinal cord area, T1WI and T2WI signal intensity compared with the postoperative there was no significant difference (P>0.01).2. Vertebral artery on the outside of atlanto-axial joint department often form four constant continuous bending and there are4types of variation. Left and right side lateral atlanto-axial joint diameter of vertebral artery and vertebral artery groove width and height of the arch after, on atlanto-axial joint surface camber Angle, camber Angle and transverse process hole vertebral artery creasing the comparison, the differences were statistically significant (P<0.05).Conclusion:1. Ligation of experimental animals lateral atlanto-axial joint before and after venous plexus, does not affect the atlas on edge to edge of atlanto-axial spinal cord blood supply, does not cause the occurrence of spinal cord injury.2. Through neck vascular CT and three-dimensional reconstruction of lateral atlanto-axial joint structure observation and measurement, for the neck after the middle of the road line of lateral atlanto-axial joint release, reset, and provide theoretical basis for internal fixation of fusion.