Table 2.

Clinical outcome and radiographic data

	Group A	Group B	p
Loss of height of fused segments (mm)	0.8 ± 0.3	2.8 ± 0.4	<0.01
Rate of severe subsidence (≥3 mm) (%)	4	17	<0.01
JOA scores
Preoperative	8.3 ± 2.1	8.0 ± 1.9	0.68
Final follow-up	13.6 ± 1.8	13.7 ± 2.2
p	<0.01	<0.01
JOA recovery ratio (%)	60 ± 8	56 ± 9	0.56
Cervical pain (VAS)
Preoperative	8.6 ± 1.2	8.4 ± 1.5	0.03
Final follow-up	3.0 ± 1.7	4.3 ± 1.8
p	<0.01	<0.01
Follow-up periods (mo)	32 ± 2	33 ± 3	0.72