Table 2.

VAS pain assessments of two groups

Group	Preoperative	Postoperative	1 month	2 months	3 months	6 months	1 year	2 years
1	9.1 ± 1.1	2.2 ± 1.4	2.5 ± 1.2	2.2 ± 1.2	1.7 ± 1.0	1.3 ± 0.9	0.9 ± 1.1	0.9 ± 1.1
2	9.1 ± 1.0	2.4 ± 0.9	1.7 ± 0.8	1.2 ± 0.6	1.0 ± 0.7	0.9 ± 0.7	0.6 ± 0.6	0.5 ± 0.6

Values are expressed as the mean ± SD. There was significant difference (P < 0.005) 1 month, 2 months, and 3 months after surgery between the two groups. The VAS after surgery was significantly lower (P < 0.005) than that of before surgery in two groups. The VAS immediately after surgery was significantly higher (P < 0.05) than that of 6 months, 1 year, and 2 years in group 1. The VAS immediately after surgery was significantly higher (P < 0.05) than that of 1 month, 2 months, 3 months, 6 months, 1 year, and 2 years in group 2.