Efficacy of transforaminal lumbar interbody fusion in the treatment of double-level lumbar spondylolisthesis with sagittal imbalance

Table 1 Preoperative, postoperative and follow-up slippage parameters

	Preoperative	Postoperative	Final follow-up	P value	Preoperative	Postoperative	Final follow-up	P value
L3 and L4 double-level spondylolisthesis
	L3 spondylolisthesis				L4 spondylolisthesis
SD(mm)	5.83 ± 1.57	0.21 ± 1.14	0.25 ± 1.25	< 0.001	6.35 ± 2.46	0.75 ± 1.32	0.72 ± 1.48	< 0.001
SA(°)	4.55 ± 2.85	7.41 ± 2.75	7.62 ± 2.80	< 0.001	1.76 ± 5.34	6.65 ± 3.93	6.78 ± 4.17	< 0.001
SP(%)	14.73 ± 4.47	2.39 ± 1.74	2.29 ± 2.19	< 0.001	15.44 ± 6.01	3.64 ± 2.13	3.35 ± 2.03	< 0.001
L4 and L5 double-level spondylolisthesis
	L4 spondylolisthesis				L5 spondylolisthesis
SD(mm)	8.43 ± 5.72	0.45 ± 1.57	0.65 ± 1.32	< 0.001	11.26 ± 3.91	2.37 ± 2.24	2.53 ± 1.54	< 0.001
SA(°)	3.97 ± 5.40	6.87 ± 5.32	7.05 ± 4.70	0.038	4.93 ± 5.23	9.73 ± 5.61	10.03 ± 5.17	0.019
SP(%)	19.47 ± 7.35	3.57 ± 1.07	3.53 ± 1.33	< 0.001	25.37 ± 8.92	6.35 ± 5.83	6.17 ± 5.03	< 0.001

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