Table 1.
Demographic, clinical, etiologic, and radiologic data for both patient groups
| Parameter | Nonrevised | Revision before age 30 years | p Value |
|---|---|---|---|
| Number of hips (number of patients) | 819 (625) | 77 (55) | |
| Age at primary THA (years) | 23.2 (16–29) | 19.7 (12–29) | p < 0.0001 |
| Mean number of previous surgeries | 0.67 (0–17) | 1.8 (0–15) | 0.003 |
| Body mass index | 26.8 (15.7–34.8) | 25.5 (14.4–36.9) | 0.8 |
| Gender ratio | M = 330/F = 295 | M = 28/F = 27 | 0.9 |
| Cup inclination (°) | 43.6° (15–62) | 44.3° (18–68) | 0.5 |
| Cup diameter (mm) | 50.2 | 48.8 | p = 0.003 |
| Merle d’Aubigné-Postel score at last followup | 15.9 (6–18) | 14.6 (8–18) | p = 0.02 |
| WOMAC score at last followup | 21 (5–60) | 20.1 (4–65) | p = 0.1 |
| Dislocation rate | 5% | 15% | p < 0.001 |
| Early dislocation (within 3 months) | 2.5% | 10% | p = 0.002 |
| Intraoperative fracture | 5.6% | 14% | p < 0.001 |
| Postoperative neurologic palsy | 2% | 7.8% | p < 0.001 |