Mean postoperative pain scores on numeric rating scale* and opioid requirements in the 2 groups
| Variable | Group; mean ± SD | p value | |
|---|---|---|---|
| Continuous femoral nerve block | Periarticular injection | ||
| Pain at rest | |||
| Postoperative day 1 | |||
| Morning | 2.6 ± 1.8 | 2.2 ± 1.7 | 0.4 |
| Afternoon | 2.9 ± 1.8 | 2.8 ± 1.5 | 0.9 |
| Postoperative day 2 | |||
| Morning | 3.2 ± 2.5 | 2.5 ± 1.4 | 0.1 |
| Afternoon | 2.8 ± 2.0 | 1.8 ± 1.3 | 0.02 |
| Pain with movement | |||
| Postoperative day 1 | |||
| Morning | 4.8 ± 2.7 | 4.5 ± 2.7 | 0.7 |
| Afternoon | 5.9 ± 2.4 | 5.2 ± 2.4 | 0.2 |
| Postoperative day 2 | |||
| Morning | 5.7 ± 2.6 | 4.6 ± 1.9 | 0.04 |
| Afternoon | 5.4 ± 2.4 | 4.2 ± 1.8 | 0.03 |
| Worst pain experienced | |||
| Postoperative day 1 | |||
| Morning | 5.6 ± 2.8 | 5.4 ± 2.8 | 0.8 |
| Afternoon | 6.6 ± 2.3 | 6.4 ± 2.6 | 0.7 |
| Postoperative day 2 | |||
| Morning | 6.7 ± 2.5 | 5.6 ± 2.0 | 0.04 |
| Afternoon | 6.3 ± 2.5 | 5.6 ± 2.2 | 0.2 |
| Overnight total dosage of patient-controlled analgesia, mg | 4.5 ± 3.2 | 3.0 ± 2.4 | 0.02 |
| Total dosage of hydromorphone in hospital, mg† | 67.2 ± 42.0 | 67.3 ± 40.5 | 0.99 |