Management of recurrent unilateral lumbar disc herniation in a single level: unilateral versus bilateral pedicle screws fixation with interbody fusion

Table 2 Comparison between unilateral group and bilateral group regarding the visual analogue scale for leg pain

VAS back		Unilateral	Bilateral	Test value^a	P value	Sig.
Preoperative	Mean ± SD	7.01 ± 1.32	7.05 ± 1.39	− 0.105	0.917	NS
Preoperative	Range	5–9	5–9	− 0.105	0.917	NS
1 month	Mean ± SD	1.69 ± 0.77	1.65 ± 0.78	0.190	0.850	HS
1 month	Range	1–3	1–3	0.190	0.850	HS
6 months	Mean ± SD	1.14 ± 0.71	1.05 ± 0.55	0.872	0.387	NS
6 months	Range	0–2	0–2	0.872	0.387	NS
12 months	Mean ± SD	0.88 ± 0.69	0.79 ± 0.73	0.203	0.840	NS
12 months	Range	0–2	0–2	0.203	0.840	NS
Repeated measures ANOVA	F	279.159	229.785
Repeated measures ANOVA	P value	< 0.001	< 0.001