Table 2.

VAS score at different time points (x ± s)

Time point	ERFA group	Control group	t value	P value
Cases (n)	30	30
Pre MBB	7.70 ± 0.85	7.56 ± 0.61	0.733	0.469
Post MBB	0.49 ± 0.48	0.50 ± 0.53	0.766	0.940
Postoperative 1 day	8.69 ± 1.07	8.70 ± 0.75	0.419	0.967
Postoperative 1 month	3.84 ± 0.83	3.83 ± 0.82	0.469	0.963
Postoperative 3 months	3.59 ± 0.93	3.55 ± 1.11	0.151	0.880
Postoperative 6 months	3.61 ± 1.02	5.75 ± 1.67	5.990	< 0.001
Postoperative 12 months	3.69 ± 1.13	5.36 ± 1.38	5.129	< 0.001
F value	273.170	200.003
P value	<0.001	<0.001