Table 2.
Patient demographics for the three Dorr classes
| Bone type | A | B | C | Overall |
|---|---|---|---|---|
| Number of hips | 625 | 1569 | 127 | 2321 (1994 patients) |
| Age* | 60 ± 11 years | 62 ± 13 years | 63 ± 14 years | 61 ± 12 years |
| Body mass index* | 31 ± 5.9 kg/m2 | 29.9 ± 6.1 kg/m2 | 28.5 ± 5.9 kg/m2 | 30.1 ± 6.1 kg/m2 |
| Female (%) | 48.2% | 42.5% | 41.1% | 43.5% |
| Preoperative Harris hip score*,† | 51.1 ± 10.8 | 50.5 ± 11.8 | 49.4 ± 12.6 | 50.6 ± 11.6 |
| Preoperative diagnosis (number of hips) | ||||
| Osteoarthritis | 580 | 1407 | 110 | 2097 |
| Rheumatoid arthritis | 4 | 19 | 0 | 23 |
| Osteonecrosis | 41 | 125 | 11 | 177 |
| Femoral fracture | 0 | 12 | 3 | 15 |
| Other‡ | 0 | 6 | 3 | 9 |
* Displayed as mean ± standard deviation; †no significant difference between cohorts; ‡Paget’s disease = 1 (Dorr C), ankylosing spondylitis = 1 (Dorr B), congenital dysplasia of the hip = 6 (Dorr B = 5, C = 1), fused hip = 1 (Dorr C).