Correlation of anatomical and functional changes of the cervical spine and spinal cord in response to changes in the axis of the cervical spine in healthy individuals measured by dynamic MRI and EPs
Abstract
Introduction: The aim of our study in healthy individuals was to assess the changes in spinal cord shape and length measured by dynamic C spine MRI with spinal functions assessed by evoked potentials (EPs). Methodology: The study included 5 men and 5 women.
MR examination as well as EPs (SEPs and MEPs) were performed in the neutral position, in the flexion and in the extension. The anterior (PD) and posterior spinal cord length (ZD) were measured on the C spine MRI.
Then transverse spinal cord dimension (PR), the anteroposterior spinal cord dimension (PZ) and the spinal cord area (P). SEPs n. medianus, SEPs n. tibialis and MEPs were registered.
Results: There was a statistically significant increase in ZD (by 9.2 mm) and PD (by 5.6 mm) during flexion. At extension bends, there was a statistically significant shortening of ZD (by 4.3 mm) and PD (by 2 mm).
During the extension, the PZ, PR and P dimensions of the spinal cord widened. There was a statistically significant increase in the amplitude of the spinal cord component N13 during flexion for median nerve SEPs.
MEPs from lower and upper limbs muscles and tibial nerve SEPs were unchanged. Conclusion: Although the graphical examination shows a change in the shape and length of the spinal cord depending on the change in the axis of the cervical spine, it has no significant effect on the spinal cord function in healthy individuals.