Objective To investigate the risk factors for deep vein thrombosis (DVT) after bone trauma.Methods The study involved 118 patients with traumatic fractures (traumatic fracture group),21 DVT patients diagnosed by color Doppler (DVT group) and 56 healthy patients (control group).Anti-cardiolipin antibody (ACA) was determined by ELISA method.D-dimer and fibrinogen (Fib) were detected by coagulation analyzer and C-reactive protein (CRP) by rate nephelometry.Results Levels of D-dimer,Fib and CRP in traumatic fracture group were significantly increased,but were lower than those in DVT group.ACA positive rate in DVT group presented significant increase and three patients with positive ACA in traumatic fracture group all suffered from DVT.The positive rates of Fib,D-dimer and CRP in lower limb fracture group,multiple fracture group and pelvic fracture group were higher than those in upper limb fracture group (P ＜ 0.05).Levels of Fib and D-dimer showed gradual rise with growth of age,but their levels in DVT group had different degree of reduction after thrombolytic therapy.Conclusions Positive ACA and enhancement of D-dimer,Fib and CRP are risk factors for DVT after bone trauma.Levels of Fib and D-dimer in patients with bone trauma are related with age and therefore risk of posttraumatic DVT increases with age.

ObjectiveTo discusses the MSCT multiplanar reconstruction manifestation (MPR) of localized fat collection adjaction to subdiaphragmatic inferior vena cava (IVCfat).MethodsThe thoracic and abdominal MSCT scan data of 8246 patients were browsed,45 patients with presumed IVCfat on axial CT scans were further studied prospectively with MSCT MPR.The predisposing position of IVCfat and its relationship with IVC were observed.It was divided into two kinds of intraluminal type and extraluminal type according to the angle of IVCfat with respect of the wall of IVC.The other 50 patients without IVCfat were randomly selected as the control group.The sagittal inclination angle (SIA) and diameter ratio (DR) between supra- and sub-diaphragmatic IVC between the two groups were compared by using t test.Results The detection rate was 0.55％ (45/8246).Of which hepatic vein lacuna 8 patients,subdiaphragmatic gap medial to IVC 28 patients and IVC groove 9 patients.The shape of IVCfat showed mainly for the round,oval and crescents on axial CT scans,of 15 patients intraluminal type,4 showed target signs .The shape of IVCfat showed mainly for half-moon at MPR.The SIA and DR at IVCfat group were 21.62° ± 8.42°and 2.01 ±0.84 respectively,at control group were 16.75° ±7.82°(t =1.594,P ＞0.05) and 1.31 ±0.28(t =2.341,P ＜ 0.05 ) respectively.ConclusionThe round,oval or half of limited fat density shadow adjaction to subdiaphragmatic inferior vena cava which similar to in the lumen is the characteristic performance of IVCfat,it may be an anatomical variation.