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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
  1. TKA total knee arthroplasty, BMI body mass index, CCI Charlson comorbidity index, COPD chronic obstructive pulmonary disease
  2. *BMI data were available for 9.1% of keloid TKA cases and 7.7% of primary TKA cases