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. 2014 Feb 25;85(1):71–78. doi: 10.3109/17453674.2013.878829

Table 1.

Primary total knee arthroplasty samples included in the study, overall and according to chronic renal disease status, 2005–2010

Chronic renal disease status
Total
No
Yes
p-value Unknown
n = 41,852 n = 34,196 (81.7%) n = 2,686 (6.4%) n = 4,970 (11.9%)
n % n % n % n %
Sex
 Female 26,058 62.3 21,420 62.6 1,607 59.8 0.004 3,031 61.0
 Male 15,785 37.7 12,769 37.3 1,079 40.2 1,937 39.0
 Unknown 9 0.0 7 0.0 0 0.0 2 0.0
Race/ethnicity
 White 28,307 67.6 23,192 67.8 1,796 66.9 < 0.001 3,319 66.8
 Hispanic 6,080 14.5 5,190 15.2 296 11.0 594 12.0
 Black 3,786 9.1 3,098 9.1 347 12.9 341 6.9
 Asian 2,241 5.4 1,918 5.6 186 6.9 137 2.8
 Other/Multi 740 1.8 578 1.7 60 2.2 102 2.1
 Unknown 698 1.7 220 0.6 1 0.0 477 9.6
ASA category
 1 and 2 24,401 58.3 20,749 60.7 909 33.8 < 0.001 2,743 55.2
 ≥ 3 16,855 40.3 13,378 39.1 1,764 65.7 1,713 34.5
 Unknown 596 1.4 69 0.2 13 0.5 514 10.3
Comorbidities
 Diabetes 11,007 26.3 8,567 25.1 1,231 45.8 < 0.001 1,209 24.3
 Congestive heart failure 1,203 2.9 894 2.6 309 11.5 < 0.001
 Valvular disease 1,127 2.7 952 2.8 175 6.5 < 0.001
 Peripheral vascular disease 1,326 3.2 1,051 3.1 275 10.2 < 0.001
 Alcohol abuse 476 1.1 429 1.3 47 1.8 0.03
 Hypertension 23,991 57.3 21,450 62.7 2,541 94.6 < 0.001
Diagnosis
 Osteoarthritis 40,773 97.4 33,271 97.3 2,645 98.5 0.002 4,857 97.7
 Osteonecrosis 162 0.4 136 0.4 7 0.3 0.3 19 0.4
 Posttraumatic arthritis 430 1.0 362 1.1 13 0.5 0.004 55 1.1
 Rheumatoid arthritis 814 1.9 685 2.0 39 1.5 0.05 90 1.8
Median Range Median Range Median Range Median Range
Age a 67 11–101 67 19–101 73 39–97 < 0.001 66 11–98
BMI, kg/m2 a 30.8 15.4–68.5 30.7 15.4–68.5 30.7 15.7–56.7 0.8 31.4 15.4–65.9
Operative time, min a 90 30–480 90 30–480 90 30–369 0.02 80 30–300
Length of stay b 3 0–33 3 0–33 3 1–24 < 0.001 3 2–8

BMI: body mass index; ASA: American Society of Anaesthesiologists score.

a Unknown: age < 0.1%, BMI 0.4%, operative time 18%.

b Length of stay available for limited sample, 2009 onwards (n = 18,821). Unknown: 13%.