palsy; in our study, the mean spinal cord shifts of from C4/ C5, C5/C6, and C6/C7 were larger in those with C6 palsies.[ 3 , 5 ] Ossification of the posterior longitudinal ligament is also thought to be a risk factor for postoperative C5 and C6 nerve root palsies, but in our series, this difference did not reach statistical significance.[ 6 , 7 ] Although our patients with C6 palsies additionally showed greater anterior protrusion of the C6 superior articular process, this was not a factor specifically analyzed in other studies.
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