Table 2.

Radiological parameters for patients in conventional LF and PFL groups

	Conventional LF	PFL	p-value
Preoperative (°)
CL	12.9±12.9	11.4±13.4	0.69
T1S	27.8±8.8	28.0±9.0	0.91
SL	9.2±10.2	7.6±9.6	0.57
C2–7 SVA	26.2±12.3	21.4±11.8	0.17
Immediate postoperative (°)
CL	15.8±9.4	14.9±10.1	0.75
T1S	29.4±9.0	32.3±7.8	0.24
SL	11.2±8.4	12.7±6.7	0.51
C2–7 SVA	27.4±12.1	27.0±15.3	0.89
Last follow-up (°)
CL	13.4±9.3	12.7±10.7	0.78
T1S	27.9±7.5	28.6±10.3	0.77
SL	8.9±7.7	11.5±8.0	0.25
C2–7 SVA	26.8±13.5	28.9±14.3	0.60
∆ Last follow-up – immediate postoperative (°)
CL	-2.3±8.1	-2.1±9.1	0.95
T1S	-1.4±7.6	-3.7±10.5	0.34
SL	-2.3±5.8	-1.2±5.9	0.51
C2–7 SVA	-0.6±10.8	1.8±17.2	0.48
∆ Immediate postoperative – preoperative (°)
CL	2.9±12.7	3.5±9.9	0.86
T1S	1.6±9.6	4.3±11.3	0.35
SL	2.0±10.5	5.1±9.4	0.29
C2–7 SVA	1.2±15.1	5.5±15.6	0.32
∆ Last follow-up – preoperative (°)
CL	0.6±11.4	1.3±11.9	0.82
T1S	0.1±8.9	0.5±9.2	0.87
SL	-0.3±8.5	4.7±7.2	0.04
C2–7 SVA	0.6±14.4	7.4±16.1	0.11

Values are presented as mean±standard deviation. LF : laminectomy and fusion, PFL : posterior floating laminotomy, CL : cervical Lordosis, T1S : T1 slope, SL : segmental lordosis, SVA : sagittal vertical axis