Table 2.

The VAS, JOA,HI and CSA change pre-operative and post-operative (x ± s n = 32).

Items	Pre-o	Post-o 1 week	Post-o 6 months	Post-o 24 months
Neck VAS	4.290 ± 0.728	1.344 ± 0.466	0.469 ± 0.439	0.483 ± 0.353
JOA	7.672 ± 1.168	13.14 ± 1.172	14.56 ± 1.256	14.64 ± 1.166
HI(mm)	6.084 ± 0.275	5.975 ± 0.260	5.978 ± 0.298	5.956 ± 0.292
CSA(°)	12.41 ± 2.890	13.64 ± 2.888	13.73 ± 2.732	13.77 ± 2.720

Pre-o pre-operative, Post-o post-operative, VAS visual analoge scale, JOA japanese orthopaedic assicioation scores, HI height of intervetebra, CSA cervical spine angle