Resting-State Functional Magnetic Resonance Imaging Connectivity of the Brain Is Associated with Altered Sensorimotor Function in Patients with Cervical Spondylosis.

OBJECTIVE: To determine the relationship between functional connectivity (FC) using resting-state functional magnetic resonance imaging (MRI) and neurological impairment in patients with cervical spondylosis and healthy controls.

METHODS: A total of 24 patients with cervical spondylosis with or without myelopathy and 17 neurologically intact, healthy volunteer subjects were prospectively enrolled in a cross-sectional study involving observational MRI and evaluation of neurological function using the modified Japanese Orthopedic Association (mJOA) score. Seed-to-seed connectivity and seed-to-voxel connectivity on functional MRI data were performed using a general linear model of connectivity with respect to age and mJOA score.

RESULTS: Increased FC was observed with increasing neurological impairment in patients with cervical stenosis within sensorimotor areas, including precentral gyrus, postcentral gyrus, and supplemental motor regions, using both seed-to-seed and seed-to-voxel analyses. The anterior cingulate showed increasing connectivity with the supplemental motor area, thalamus, and cerebellum with increasing neurological function. Similarly, the thalamus, cerebellum, and putamen presented with increasing connectivity to both the bilateral precuneus and the posterior cingulate with an increasing mJOA score.

CONCLUSIONS: Patients with cervical spondylosis exhibiting neurological impairment experience changes in brain connectivity similar to that of patients with chronic traumatic spinal cord injury. These results suggest an increase in FC within sensorimotor regions with increasing neurological impairment and decreased connectivity between the cerebellum, putamen, and thalamus to the anterior and posterior cingulate and frontal lobe regions.