Official Journal of the Italian Society of Orthopaedics and Traumatology
Table 1 Comparison of demographics and clinical characteristics of patients receiving primary TKA
From: Arthrofibrosis after total knee arthroplasty: patients with keloids at risk
Demographic variable | TKA w/ Hx of keloid (n = 11,461) | Primary TKA (n = 534,414) | p |
|---|---|---|---|
Sex, n (%) | |||
 Female | 7014 (61.2) | 343,482 (64.3) | 0.001 |
 Male | 4447 (38.8) | 199,932 (37.4) | 0.042 |
Age, n (%) | |||
 < 65 | 4413 (38.5) | 224,759 (42.1) |  < 0.001 |
 65–79 | 7048 (61.5) | 318,655 (59.6) | 0.046 |
 ≥ 80 | 0 (0.0) | 0 (0.0) |  |
BMI*, n (%) | |||
 < 30 | 35 (0.3) | 1361 (0.3) | 0.333 |
 30–40 | 336 (2.9) | 15,307 (2.9) | 0.698 |
 ≥ 40 | 373 (3.3) | 20,905 (3.9) |  < 0.001 |
CCI, mean ± SD | 1.5 ± 2.0 | 1.3 ± 1.8 |  < 0.001 |
Specific comorbidities, n (%) | |||
Tobacco use | 1310 (11.4) | 60,994 (1.4) | 0.972 |
Rheumatoid arthritis | 562 (4.9) | 23,725 (4.4) | 0.024 |
Liver disease | 737 (6.4) | 28,463 (5.3) |  < 0.001 |
Congestive heart failure | 694 (6.1) | 31,317 (5.9) | 0.418 |
Cardiac disease | 3003 (26.2) | 126,743 (23.7) |  < 0.001 |
COPD | 2729 (23.8) | 114,197 (21.4) |  < 0.001 |
Chronic kidney disease | 849 (7.4) | 35,254 (6.6) | 0.001 |
History of alcohol use | 172 (1.5) | 7918 (1.5) | 0.900 |
Preoperative anemia | 2250 (19.6) | 90,641 (17.0) |  < 0.001 |
Immunocompromised | 319 (2.9) | 13,526 (2.5) | 0.104 |
Depression | 1868 (16.3) | 81,008 (15.2) | 0.004 |
Region, n (%) | |||
 South | 4,944 (43.1) | 210,405 (39.4) |  < 0.001 |
 Midwest | 2,893 (25.2) | 162,392 (30.4) |  < 0.001 |
 Northeast | 2,304 (20.1) | 100,760 (18.9) | 0.006 |
 West | 1,311 (11.4) | 69,135 (12.9) |  < 0.001 |
 90-day readmission rate, n (%) | 978 (8.5) | 39,744 (7.4) |  < 0.001 |