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%.