Abstract: Objective:Study on the effect of low molecular heparin calcium in preventing legs deep venous thrombosis after lower extremity fracture. Methods: 173 cases of extremity vein thrombosis patients who were diagnosed and treated in Tianjin Haihe Hospital from January 2007 to January 2010. 173 patients were randomly devided into Treatment group(123 cases) and control group(50 cases) . Low molecular weight heparin calcium for treatment group and aspirin for group. Compared the incidence of extremity vein thrombosis between the two groups. Results:The incidence of extremity vein thrombosis in treatment group was significantly lower than that of control group. Conclusions: Low molecular weight heparin calcium to prevent deep vein thrombosis after lower extremity fracture is significant effect.

Key words: low molecular heparin calcium, deep vein thrombosis, lower extremity fracture, prevention