Abstract: Objective To investigate the effect of elastic pants on coagulation function and deep vein thrombosis by examining blood coagulation function and deep vein thrombosis in patients with liposuction in the thigh before and after operation.Methods  80 patients with liposuction were randomly divided into Ankle-length elastic pants (Ankle group,A group,n=40)and Knee-length elastic pants (Knee group,K group,n=40) from October 2021 to October 2022.After liposuction surgery,the two groups of patients used elastic bandage to initially compress and bind the thigh.According to the length of the patients’ thigh,the patients in A group wore appropriate ankle-length elastic pants and the patients in K group wore appropriate knee-length elastic pants.The index were recorded including the popliteal vein flow rate,the common femoral vein flow rate,the instep temperature,the incidence of deep vein thrombosis(DVT),the incidence of intramuscular vein thrombosis of leg and the coagulation indexes (APTT,PT,Fib,D-dimer).Results Compared with pre-operation,the blood flow rate of popliteal vein and common femoral vein in A group was significantly faster,while the blood flow rate of popliteal vein in K group was significantly slower (P<0.05).There was no significant change in APTT and PT in the two groups after operation (P>0.05),but the Fib and D-Dimer increased significantly on the first day after operation,and then decreased gradually (P<0.05).Compared with K group,the blood flow of popliteal vein and common femoral vein in A group was significantly faster at each time point after operation (P<0.05).The Fib and D-Dimer of patients in A group were significantly lower than those in K group on the 1st,3rd and 7th day after operation (P<0.05),and the blood coagulation index between the two groups returned to normal around the 14th day.There was no statistically significant difference in the instep temperature between groups and within groups (P>0.05).No deep venous thrombosis was found in A group after surgery,while there were 3 cases of deep venous thrombosis without clinical symptoms in K group on the 3rd and 7th day,with no statistical difference（P>0.05).After surgery,patients in A group and K group had intramuscular venous thrombosis of the leg on the 1st,3rd and 7th day after surgery,and there was statistically significant difference on the 3rd and 7th day between the two groups (P<0.05).Conclusion Thigh liposuction can lead to deep vein thrombosis without obvious clinical symptoms and intramuscular vein thrombosis of leg.Ankle-length elastic pants are more conducive to blood circulation of patients’ legs,improve blood hypercoagulability,and reduce the risk of deep vein thrombosis after operation.

Key words: elastic pants, thigh, liposuction, deep vein thrombosis, coagulation