Abstract:Objective To explore the risk factors of venous thromboembolism (VTE) after major orthopaedic surgery. Methods A retrospective case-control study was conducted to collect 220 patients undergoing major orthopaedic surgery. 102 patients complicated with VTE within 3 months after operation were selected as the observation group and 118 patients without VTE were selected as the control group. Various risk factors were recorded and scored by Caprini thrombosis risk assessment model, and the relationship between risk factors and VTE was analyzed. Results There were significant differences in age, history, fibrinogen, D-dimer, homocysteine, operation position, operation time and blood transfusion between the two groups (P < 0.05). The risk factor score of Caprini thrombosis in the observation group was significantly higher than that in the control group (P < 0.05). Logistic regression analysis showed that the past history, fibrinogen, D-dimer, operation position and operation time were independent risk factors for thrombosis in patients undergoing major orthopaedic surgery (P < 0.05). Conclusions VTE after major orthopaedic surgery is the result of multiple risk factors. Caprini score can better assess the risk of VTE in patients with major orthopaedic surgery. The patient’s past history, fibrinogen, D-dimer, operation position and operation time are independent risk factors for thrombosis in patients with major orthopaedic surgery, which should be given full attention.