Table 2.

Clinical and radiological outcomes

Variable	Preoperative	Duration of follow-up
		3 mo	6 mo	1 yr	2 yr
Clinical outcomes
Japanese Orthopaedic Association score	10.1±2.2	13.1±2.0*	13.3±2.1*	13.3±2.2*	13.9±2.1*
Radiological outcomes
Subsidence	-	0	14 (22.5)	14 (22.5)	14 (22.5)
C2–7 angle (°)	8.19±13.2	10.7±11.5	11.5±14.1	13.0±15.3	10.9±14.5
Local segmental angle (°)	4.44±8.91	5.56±6.79	5.76±8.61	5.29±10.3	3.06±9.03

Values are presented as mean±standard deviation or number (%).

^*p <0.01 comparing mean differences against preoperative value.