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Table 2 Patient and procedure related risk factors for revision due to infection after primary TKA

From: Patient and surgical factors affecting procedure duration and revision risk due to deep infection in primary total knee arthroplasty

Variables No RR (95% CI)
Unadjusted p-value
RR (95% CI)
Adjusted
p-value
Age
 60-69 9717 1   1  
  < 60 4989 0.9 (0.7-1.3) 0.7 0.9 (0.7-1.3) 0.6
 70-79 10,009 0.8 (0.6-1.0) 0.1 0.8 (0.6-1.1) 0.1
  > 80 3547 0.7 (0.5-1.1) 0.1 0.7 (0.5-1.1) 0.1
Sex
 men 10,186 1   1  
 women 18,076 0.5 (0.4-0.6) <0.001 0.5 (0.4-0.6) <0.001
Diagnosis
 OAa 25,152 1   1  
 Otherb 3110 1.6 (1.2-2.1) 0.004 1.4 (1.0-2.0) 0.04
ASA
 1 4167 1   1  
 2 17,918 1.1 (0.8-1.5) 0.7 1.2 (0.8-1.7) 0.4
 3+ 5621 1.7 (1.2-2.5) 0.005 1.8 (1.2-2.7) 0.003
Hospital volume
 1-49 3953 1   1  
 50-99 10,615 1.1 (0.8-1.6) 0.5 1.1(0.8-1.6) 0.5
 100-149 6379 1.2 (0.8-1.7) 0.4 1.1 (0.7-1.7) 0.6
  ≥ 150 7315 1.2 (0.8-1.7) 0.4 1.1 (0.7-1.7) 0.6
Perioperative complications
 no 27,068 1   1  
 yes 640 2.3 (1.4-3.9) 0.002 2.1 (1.3-3.6) 0.004
Computer navigation
 no 23,626 1   1  
 yes 2462 1.0 (0.7-1.5) 1.0 1.0 (0.7-1.5) 1.0
Prior fracturec
 no 27,711 1   1  
 yes 551 2.20(1.1-3.6) 0.02 1.5 (0.8-2.7) 0.2
Prior osteotomyd      
 no 27,377 1   1  
 yes 885 0.9 (0.5-1.8) 0.8 0.8 (0.4-1.5) 0.5
TKA implant brands
LCS Complete 8752 1   1  
AGC 2233 0.8 (0.5-1.3) 0.3 0.8 (0.5-1.3) 0.3
LCS 516 1.1 (0.5-2.3) 0.9 1.3 (0.6-2.9) 0.5
Duracon 2043 1.6 (1.1-2.3) 0.02 1.5 (0.8-2.7) 0.2
NexGen 4717 1.2 (0.8-1.6) 0.4 1.0 (0.7-1.4) 1.0
Profix 6286 0.9 (0.6-1.2) 0.4 0.9 (0.6-1.2) 0.4
PFC Sigma 697 1.0 (0.4-2.3) 1.0 0.9 (0.4-2.0) 0.7
Triathlon 1317 1.0 (0.6-1.8) 1.0 0.9 (0.5-1.5) 0.6
Vanguard TM 741 0.3 (0.1-1.0) 0.06 0.2 (0.1-0.8) 0.03
Otherse 955 0.4 (0.1-1.0) 0.05 0.4 (0.1-1.0) 0.06
Time Period
 2005-2009 12,362 1   1  
 2010-2014 15,900 1.3 (1.0-1.6) 0.03 1.3 (1.0-1.6) 0.08
  1. aOA = Osteoarthritis
  2. bOther = other diagnosis than osteoarthritis, e.g. inflammatory diseases
  3. cIntraarticular fracture or fracture in proximity to the joint with previous osteosynthesis
  4. dPrevious knee osteotomy for knee malalignment
  5. eImplant brands used in smaller numbers than 500 during the time period from 2005 to 2014