Abstract: Abstract Objective To analyze the clinical risk factors for deep vein thrombosis(DVT) after operation for fracture.Methods The data of 515 patients with fracture undergoing operations in a hospital in Tijin between December 2003 and January 2005 were consecutively studied. Color Doppler ultrasonography(American ACUSON128/XP) was used to detect DVT of bilateral lower extremities in all patients in 7 days after operation.25 clinical factors were examined by univariate and multivariate logistic regression analysis in order to analyze their influence on DVT after surgery.Result There were 394 male(76.5%)and 121female(23.5%)patients with a mean age of 40 years,ranging 14-79 years.The prevalence of DVT after surgery was 11.3% among the patients(58/515).Logistic regression analysis demonstrated a definite association of time rate of thrombin,smoking,body mass index, lactic dehydrogenase,phosphorus with odds ratio of24.015, 2.802,1.113, 1.007 and 0.100 respectively(P<0.05).Other clinical factors had no statistical significant association with DVT(P>0.05).Conclusion Smoking,body mass index, time rate of thrombin,lactic dehydrogenase are risk factors for DVT after operatins for fractures while phosphorus is protecting factor for DVT after operatins for fractures.

Key words: Deep vein thrombosis, Fracture, Risk factors