Table 2.
Changes in outcome scores 12 months after surgery
| Score | All patients (n = 560) | Osteoarthritis* | Rim cartilage degeneration† | ||
|---|---|---|---|---|---|
| No (n = 449) | Yes (n = 108) | No (n = 275) | Yes (n = 283) | ||
| MHHS | |||||
| Preoperative‡ | 67.3 (16.1) | 68.6 (16.6) | 61.5 (12.6) | 66.3 (15.9) | 68.3 (16.3) |
| 12 months‡ | 80.7 (18.6) | 83.4 (17.6) | 69.6 (18.3) | 84.1 (17.4) | 77.5 (19.1) |
| Change‡,§ | 13.5 (18.3) | 14.8 (18.1) | 8.1 (18.2) | 17.7 (17.5) | 9.2 (18.1) |
| Difference between groups‖ | 6.8 (0.001, 2.9–10.6) | 7.0 (0.000, 5.5–11.4) | |||
| NAHS | |||||
| Preoperative‡ | 66.4 (17.6) | 67.4 (17.9) | 61.8 (15.8) | 65.2 (18.2) | 67.8 (16.9) |
| 12 months‡ | 80.0 (18.7) | 82.6 (17.5) | 69.0 (19.2) | 82.9 (17.4) | 77.2 (19.5) |
| Change‡,§ | 13.4 (18.2) | 14.9 (17.4) | 7.9 (20.2) | 17.4 (17.1) | 9.6 (18.4) |
| Difference between groups‖ | 8.5 (0.000, 3.1–10.9) | 7.9 (0.000, 4.9–10.9) | |||
* According to presence of intraoperative osteoarthritis (articular cartilage degeneration C Grade 1); †rim cartilage degeneration (rim lesion C Grade 3); *three patients are missing osteoarthritis grade; †two patients are missing rim lesion grade; ‡values are expressed as mean, with SD in parentheses; §change = 12-month score – preoperative score; ‖values are expressed as mean, with p value and 95% CI in parentheses; MHHS = modified Harris hip score; scores range from 0 to 100.1, with higher scores indicating optimal outcome; NAHS = nonarthritic hip score; scores range from 0 to 100, with higher scores indicating optimal outcome.