Table 2.

Patients' information

^*Lateral mass screws were used for above C7 level fixation. M : males, F : females, Post-lamin : post-laminectomy kyphosis, LH & R : laminar hook and rod fixation, PS & R : pedicle screw and rod fixation, Corp : corpectomy level, Lamin : laminectomy level, P : posterior approach only, A+P : anteriorr with posterior approach, MUO : mass of unknown origin