F2 and Varicose veins: In the modeling group, 17 variables were analyzed by univariate logistic regression analysis, and the results showed that 11 variables were potential risk factors for lower extremity DVT after total knee arthroplasty, including age, BMI, smoking, diabetes mellitus, hyperlipidemia, varicose veins of the lower extremity, time of tourniquet use, postoperative prothrombin time, postoperative thrombin time, postoperative D-dimer, and postoperative bedtime (Table 1).