Table 1 Group demographics for patients under and over 50 years old
From: Metal-on-metal hip resurfacing in patients younger than 50 years: a retrospective analysis
Group 1, <50 (N = 1285) | Group 2, ≥50 (N = 1984) | p value | |
|---|---|---|---|
Sex (no. of hips) | |||
Male | 951 (74%) | 1426 (72%) | 0.1802 |
Female | 334 (26%) | 558 (28%) | |
Deceased# | 10 (0.8%) | 29 (1.5%) | 0.0784 |
F/U mean years | 3.4 ± 2.98 | 2.8 ± 2.59 | <0.0001* |
Lost to F/U | 17 (1.3%) | 23 (1.2%) | 0.6745 |
Case date range | 1/2001–8/2013 | – | |
Age (years) | 44 ± 6.02 | 57 ± 4.23 | <0.0001* |
BMI | 28 ± 4.92 | 28 ± 4.56 | 0.0750 |
T-score | 0.26 ± 1.36 | −0.14 ± 1.18 | <0.0001* |
Uncemented fixation (no. of hips) | 776 (60%) | 1380 (70%) | <0.0001* |
10-year survivorship (no. of hips) | 1234 (96%) | 1924 (97%) | 0.1443 |
Diagnosis (no. of hips) | |||
Dysplasia | 149 (12%) | 214 (11%) | 0.4715 |
Osteoarthritis (OA) | 866 (67%) | 1589 (80%) | <0.0001* |
Osteonecrosis (ON) | 107 (8.3%) | 63 (3.2%) | <0.0001* |
Rheumatoid arthritis (RA) | 9 (0.7%) | 2 (0.1%) | 0.0039* |
Post-trauma | 40 (3.1%) | 20 (1.0%) | <0.0001* |
Legg-Calve-Perthes disease (LCP) | 32 (2.5%) | 7 (0.4%) | <0.0001* |
Slipped capital femoral epiphysis (SCFE) | 12 (0.9%) | 9 (0.5%) | 0.0930 |
Other | 22 (1.7%) | 21 (1.1%) | 0.1096 |
Implants (no. of hips) | |||
Corin Cormet 2000 | 187 (14%) | 185 (9.3%) | <0.0001* |
Biomet ReCap™-Magnum™ hybrid | 330 (26%) | 409 (21%) | 0.0007* |
Biomet ReCap™-Magnum™ uncemented | 768 (60%) | 1390 (70%) | <0.0001* |
ASA score | 1.6 ± 0.57 | 1.7 ± 0.58 | <0.0001* |
Femoral component <48 mm (no. of hips) | 199/973 (20%) | 334/1641 (20%) | 0.9522 |
Femoral component size | 50.0 ± 3.92 | 50.2 ± 3.53 | 0.1793 |