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Table 1 Characteristics of matched patients revised and not revised for PJI following primary THR

From: What are the inpatient and day case costs following primary total hip replacement of patients treated for prosthetic joint infection: a matched cohort study using linked data from the National Joint Registry and Hospital Episode Statistics

  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)