8Terao M,Ozaki T,Sato T.Diagnosis of deep vein thrombosis after operation for fracture of the proximal femur:Comparative study of ultrasonography and venography[J].J Orthop Sci,2006,11(2):146-153.
9Kwong LM.Hip fracture and venous thromboembolism in the elderly[J].J Surg Orthop Adv,2004,13(3):139-148.
10Geerts WH,Bergqvist D,Pineo GF,et al.Prevention of venous thromboembolism:American college of chest physicians evidence-based clinical practice guidelines[J].Chest,2008,133(6):381-453.