Table 2.

Preoperative clinical values and outcomes at the last follow-up

Variables	Preoperative period	Last follow-up	P
JOA	11.8 ± 2.0	15.4 ± 1.2	<0.001
NDI	37.3 ± 14.3	13.7 ± 10.9	<0.001
VAS	64.4 ± 15.1	17.4 ± 13.3	<0.001

JOA Japanese Orthopedic Association, NDI Neck Disability Index, VAS visual analog scale for neck pain