Control group

Ropivacaine group

Combination group

VAS

2 h PO

6.6 ± 1.4

4.86 ± 1*

3.7 ± 0.8*^†

4 h PO

5.1 ± 1.3

2.65 ± 1.3*

2.55 ± 1.5*

8 h PO

3.9 ± 2.2

2.9 ± 1.2*

2.3 ± 0.8*

12 h PO

4.2 ± 1.4

2.66 ± 1.3*

1.9 ± 1.2*

24 h PO

3.7 ± 1.6

2.8 ± 1.3*

1.91 ± 1.2*^†

48 h PO

4.5 ± 1.6

2.5 ± 1.2*

1.66 ± 0.8*^†

72 h PO

3.4 ± 1.5

1.8 ± 1.1*

1.5 ± 0.6*^†

Number of request of rescue analgesia (time)

5.4 ± 1.18

3.5 ± 0.9*

1.88 ± 0.57*^†

Total dose of meperidine

268 ± 59

172 ± 31*

91.9 ± 32.6*^†