Table 1 Clinical and demographic characteristics of patients with primary total hip or knee arthroplasty (THA/TKA)
Characteristic | Primary THA | Primary TKA | ||
|---|---|---|---|---|
2 years | 5 years | 2 years | 5 years | |
(n = 3,823) | (n = 2,374) | (n = 4,701) | (n = 2,935) | |
Mean age ± SD | 64.8 ± 13.2 | 64.3 ± 12.8 | 68.4 ± 9.5 | 68.5 ± 9.1 |
Men/women (%) | 48%/52% | 48%/52% | 44%/56% | 45%/55% |
Age groups, n (%): | Â | Â | Â | Â |
 ≤60 years | 31% | 31% | 18% | 17% |
 >60 to 70 years | 31% | 33% | 36% | 39% |
 >70 to 80 years | 29% | 28% | 38% | 38% |
 >80 years | 8% | 6% | 7% | 6% |
Body mass index, kg/m2 | Â | Â | Â | Â |
 ≤25 (normal) | 25% | 24% | 13% | 13% |
 >25 to 29.9 (overweight) | 39% | 40% | 35% | 36% |
 30 to 34.9 (mildly obese) | 23% | 23% | 30% | 30% |
 35 to 39.9 (obese) | 8% | 8% | 14% | 14% |
 ≥40 (morbidly obese) | 4% | 4% | 8% | 7% |
ASA score: | Â | Â | Â | Â |
 Class I to II | 63% | 65% | 59% | 60% |
 Class III to IV | 36% | 35% | 41% | 40% |
Implant fixation: | Â | Â | Â | Â |
Cemented | 10% | 12% | 98% | 100% |
Hybrid | 55% | 60% | 0% | 0% |
Uncemented | 35% | 28% | 0% | 0% |
Underlying diagnosis | Â | Â | Â | Â |
 Inflammatory arthritis | 2% | 3% | 3% | 4% |
 Osteoarthritis | 88% | 86% | 96% | 93% |
 Avascular necrosis of bone | 7% | 7% | - | - |
 Othera | 3% | 4% | 2% | 3% |