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Table 1 Patient and procedure characteristics at primary TKA relative to the four procedure duration groups

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

  Procedure Duration Groups  
  < 75 min 75 – 89 90 – 109 ≥110 p-value
Number of procedures 5680 6238 8659 7685  
Year of operation 2010-2014 (n = 15,900) % 60 58 57 52 P < 0.001
Male sex (n = 10,186) % 28 31 37 44 P < 0.001
Age group %      P < 0.001
<60 (n = 4989) 15 17 17 21  
60-69 (n = 9717) 33 34 34 36  
70-79 (n = 10,009) 38 36 36 32  
≥80 (n = 3547) 14 13 13 11  
Median age (years) (range) 71 (31-96) 70 (25-94) 70 (23-101) 68 (22-93)  
Median annual hospital volume 118 113 95 86 P < 0.001
ASA %      P = 0.001
1 (n = 4167) 16 14 14 16  
2 (n = 17,918) 64 65 64 62  
3+ (n = 5621) 19 19 20 21  
Osteoarthritis (n = 25,152) % 92 90 88 87 P < 0.001
Perioperative complications (n = 640) % 0.7 1.1 1.8 4.9 P < 0.001
Previous surgery for intraarticular fracture or fracture near the joint (n = 551) % 0.8 1.3 1.7 3.6 P < 0.001
Previous high tibial osteotomy (n = 885) % 1.9 2.5 2.8 4.9 P < 0.001
Computer navigated TKA (n = 2462) % 2.5 5.6 9.0 18 P < 0.001
Systemic antibiotics (n = 28,108) % 100 100 100 100 P = 0.4
Prosthesis brand %      P < 0.01
LCS Complete (n = 8752) 26 31 31 34  
Profix (n = 6286) 23 24 23 20  
NexGen (n = 4717) 18 16 16 17  
AGC (n = 2233) 15 7.3 6.1 5.1  
Duracon (n = 2043) 5.7 6.8 6.8 9.2  
Triathlon (n = 1317) 5.2 4.0 5.2 4.1  
Vanguard (n = 741) 1.5 1.7 3.7 3.0  
PFC-Sigma (n = 697) 1.3 2.6 3.0 2.7  
LCS (n = 516) 1.3 1.2 2.0 2.5  
Other (n = 955) 3.3 5.0 2.9 2.7