Table 1.

Continuous and categorical variables used to identify possible predictors of joint infection

Preoperative variables
Demographic factors: Gender, age, ethnicity, height, weight, body mass index
Patient medical factors: American Society of Anesthesiologists score, alcohol abuse, hypertension, hyperlipidemia, diabetes mellitus, rheumatoid arthritis, cardiac arrhythmias, coronary heart disease, peripheral vascular disease, congestive heart failure, cardiac transplant, cardiac valvular disease, dementia, stroke, neurologic disease (paralysis, dyskinesia, Parkinson), renal insufficiency, renal failure and dialysis, anemia (aplastic, autoimmune, iron deficiency), coagulopathy, urinary tract infection, liver disease (hepatitis B, hepatitis C, hepatic insufficiency), malignancy (all visceral, metastatic and melanoma), tuberculosis, venous thromboembolic disease
Preoperative laboratory values: Hemoglobin, international normalized ratio (INR), leukocyte count, glucose, creatinine, albumin
Surgical and postoperative variables
Surgery: Joint operated (hip versus knee), side (unilateral, simultaneous bilateral), operative time (minutes)
Blood management: Transfusion (yes or no, number of units transfused, type of transfusion—allogenic versus autologous)
Postoperative laboratory values: Hemoglobin, INR, leukocyte count, glucose, creatinine, albumin
Postoperative medical complications: Urinary tract infection, pneumonia, Clostridium difficile-associated diarrhea, pulmonary embolism, acute myocardial infarction, arrhythmia, congestive heart failure, atrial fibrillation, stroke, deep venous thrombosis, lung aspiration, fever
Postoperative local complications: Cellulitis, hematoma, wound infection, wound drainage, wound dehiscence, blisters, vascular injury, compartment syndrome, dislocation