Table 2.
Comparison of posterior approaches according to the treatment of the external rotators
| Variable | The ERP group (A) | The repair group (B) | The no-repair group (C) | p Value | Duncan |
|---|---|---|---|---|---|
| Surgical factors | |||||
| Operation time (minutes)* | 91.1 ± 8 | 90.1 ± 11.6 | 81.2 ± 14.1 | < 0.001 | A,B > C |
| Postoperative blood loss (mL)* | 718.7 ± 258.6 | 745.8 ± 234 | 736.6 ± 209.1 | 0.465 | |
| Radiographic evaluation | |||||
| Cup anteversion (degrees)* | 11.5 ± 5.7 | 15.3 ± 5.5 | 15 ± 4.9 | < 0.001 | B,C > A |
| Cup inclination (degrees)* | 43.2 ± 3.5 | 42.2 ± 3.6 | 42.5 ± 3.7 | 0.013 | A > B |
| Stem malposition | 3 | 3 | 4 | ||
| Clinical evaluation | |||||
| Preoperative Harris hip scores* | 50.1 ± 11.5 | 42.4 ± 12.5 | 46.7 ± 10.8 | 0.019 | A > B |
| 1-year postoperative Harris hip scores* | 97 ± 2.9 | 94.9 ± 3.4 | 94.2 ± 3.2 | < 0.001 | A > B,C |
| Complications | |||||
| Dislocation rate (%)* | 0/220 (0) | 11/282 (3.9) | 9/168 (5.3) | 0.004 | |
| Infection | 0 | 1 | 0 | ||
| Nerve palsy | 0 | 1 | 2 | ||
*Mean ± standard deviation; ERP = external rotator preservation.