Table 2.

Comparison of radiological parameters from pre- to postoperatively

Radiological parameters	Preoperation	2-year follow-up	P value
Modified Pfirrmann classification of nonfusion segment	5.0 ± 1.0	4.9 ± 1.1	0.102
DHI of nonfusion segment	0.34 ± 0.07	0.33 ± 0.05	0.233
Lordosis of nonfusion segment (°)	10.5 ± 4.3	8.3 ± 3.0	0.005
Modified Pfirrmann classification of upper adjacent segment	3.3 ± 1.2	3.4 ± 1.2	0.655
DHI of upper adjacent segment	0.34 ± 0.04	0.33 ± 0.04	0.450
Lordosis of upper adjacent segment(°)	9.3 ± 3.6	10.7 ± 3.7	0.010
Lordosis of fixed-segment (°)	27.5 ± 9.3	26.8 ± 6.4	0.612
Lordosis of fixed-segment at flexion position (°)	21.2 ± 9.2	25.3 ± 6.9	0.004
Lordosis of fixed-segment at extension position (°)	31.2 ± 9.4	27.8 ± 7.0	0.015
ROM of fixed-segment (°)	10.0 ± 3.9	2.6 ± 1.2	0.000
LL (°)	43.0 ± 14.6	44.4 ± 11.0	0.411
PI (°)	45.1 ± 9.2	45.8 ± 8.8	0.225