Table 3. Summary of pre- and postoperative radiological outcomes.

Variables	Radiological outcomes	P value
Spondylolisthesis (%)
Preoperative	7.5±6.5
Postoperative
6 weeks	1.3±1.1	<0.0001
6 months	0.95±0.74	<0.0001
12 months	1.9±1.7	0.0006
Anterior disc height (mm)
Preoperative	7.3±3.2
Postoperative
6 weeks	11.6±2.5	<0.0001
6 months	12.2±3.3	<0.0001
12 months	9.8±2.1	0.0032
Posterior disc height (mm)
Preoperative	4.4±2.0
Postoperative
6 weeks	6.8±2.1	<0.0001
6 months	6.6±2.5	0.0003
12 months	5.9±1.4	0.0039
Local disc angle (deg)
Preoperative	7.0±3.7
Postoperative
6 weeks	9.2±3.3	0.0072
6 months	10.4±3.9	0.0013
12 months	8.2±2.9	0.2487
Lumbar lordosis (deg)
Preoperative	45.0±14.5
Postoperative
6 weeks	44.7±13.3	0.9137
6 months	49.1±11.7	0.2674
12 months	40.3±12.9	0.2394
Foraminal height (mm)
Preoperative	18.3±3.5
Postoperative
6 weeks	21.5±3.9	0.0004
6 months	20.6±3.4	0.0266
12 months	18.7±1.9	0.8021
Foraminal width (mm)
Preoperative	7.9±2.0
Postoperative
6 weeks	10.2±2.8	0.0001
6 months	9.4±2.6	0.0219
12 months	8.3±1.6	0.5734