Characteristics of eligible primary total knee arthroplasty recipients
| Total number of patients | N=169 713 |
| Demographics | |
| Age (years) (median (IQR)) | 68 (61–75) |
| Women (N (%)) | 106 070 (62.49%) |
| Income quintile (N (%)) | |
| Lowest | 30 057 (17.71%) |
| 2 | 35 079 (20.66%) |
| 3 | 34 561 (20.36%) |
| 4 | 34 510 (20.33%) |
| Highest | 35 067 (20.66%) |
| Comorbidities (N (%)) | |
| Coronary artery disease | 5443 (3.20%) |
| Congestive heart failure | 9811 (5.78%) |
| Chronic obstructive pulmonary disease | 32 018 (18.86%) |
| Diabetes | 45 698 (26.92%) |
| Hypertension | 123 875 (72.99%) |
| Frail | 11 562 (6.81%) |
| Charlson score (N (%)) | |
| 0 | 120 151 (70.79%) |
| 1 | 31 647 (18.64%) |
| 2 | 11 374 (6.70%) |
| 3 or more | 6541 (3.85%) |
| Admission characteristics | |
| Hospital volume (median (IQR)) | 362 (253–526) |
| Surgeon volume (median (IQR)) | 89 (59–127) |
| Surgeon years in practice (median (IQR)) | 15 (8–24) |
| Outcome (N (%)) | |
| Revision (for all causes) within 3 years | 3199 (1.88%) |
| Deep infection requiring surgery within 3 years | 1926 (1.13%) |