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) |  |  |