Table 1.
Characteristics of matched patients revised and not revised for PJI following primary THR
| Revised PJI group (n = 422) | Comparator group (n = 1923) | ||
|---|---|---|---|
| Number (%) | Number (%) | ||
| Date of primary—range | 16/05/03–02/12/09 | 28/04/03–01/12/09 | |
| Age—mean (range) | 66 (21–95) | 67 (23–92) | |
| Female | 191 (45) | 891 (46) | |
| Osteoarthritis diagnosis | 398 (94) | 1862 (97) | |
| ASA grade | |||
| P1 | 69 (16) | 302 (16) | |
| P2 | 298 (71) | 1399 (73) | |
| P3 | 55 (13) | 222 (12) | |
| Charlson | |||
| 0 | 275 (65) | 1415 (74) | |
| 1 | 97 (23) | 333 (17) | |
| 2 | 31 (7) | 104 (5) | |
| 3 or above | 19 (5) | 71 (4) | |
| Procedure | |||
| Cemented | 164 (39) | 782 (41) | |
| Uncemented | 158 (37) | 668 (35) | |
| Hybrid/reverse hybrid | 64 (15) | 324 (17) | |
| Resurfacing | 36 (9) | 149 (8) | |
| Bearing type | |||
| Metal-on-plastic | 254 (60) | 1179 (61) | |
| Metal-on-metal | 99 (23) | 354 (18) | |
| Ceramic-on-ceramic | 41 (10) | 199 (10) | |
| Ceramic-on-plasticmetal-on-ceramic/ceramic-on-metal | 28 (7) | 191 (10) | |
| Matches per revised PJI patient | |||
| 5 matching comparator patients | 358 (85) | ||
| 4 matching comparator patients | 13 (3) | ||
| 3 matching comparator patients | 9 (2) | ||
| 2 matching comparator patients | 12 (3) | ||
| 1 matching comparator patients | 30 (7) | ||