Table 1.
Clinical and demographic characteristics
| 2-year (n = 1533) | 5-year (n = 881) | |
|---|---|---|
| Age, mean (s.d.), years | 69 (10) | 69 (10) |
| Men/women, % | 49/51 | 51/49 |
| Age groups, % | ||
| ≤60 years | 20 | 20 |
| >60–70 years | 29 | 31 |
| >70–80 years | 42 | 41 |
| >80 years | 9 | 8 |
| BMI, % | ||
| <25 kg/m2 | 13 | 14 |
| 25–29.9 kg/m2 | 36 | 39 |
| 30–34.9 kg/m2 | 29 | 27 |
| 35–39.9 kg/m2 | 14 | 14 |
| ≥40 kg/m2 | 7 | 5 |
| ASA class | ||
| Class I–II | 50 | 53 |
| Class III–IV | 50 | 47 |
| Deyo–Charlson index, mean (s.d.) | 1.0 (1.7) | 0.8 (1.4) |
| Psychological comorbidity, % | ||
| Anxiety | 5 | 3 |
| Depression | 8 | 6 |
| Operative diagnosis, % | ||
| Loosening/wear or osteolysis | 57 | 61 |
| Dislocation, bone or prosthesis fracture, instability, non-union | 22 | 20 |
| Failed prior arthroplasty with components removed or infection | 21 | 19 |
| Distance category, % | ||
| 0–100 miles | 32 | 34 |
| >100–500 miles | 57 | 54 |
| >500 miles or non-US | 11 | 12 |
| Preoperative pain, % | ||
| None/mild | 46 | 46 |
| Moderate–severe | 54 | 54 |
| Preoperative overall ADL limitation, % | ||
| None/mild | 12 | 10 |
| Moderate–severe | 88 | 90 |