F2 and deep vein thrombosis: The secondary observation indicators included postoperative incision healing, number of lower limb deep vein thrombosis (DVT), prothrombin time (PT), activated partial thromboplastin time (APTT), thrombin time (TT), fibrinogen (FIB), platelet count (PLT) and postoperative hospital stay.<h4>Results</h4>The surgeries were successfully completed.