Abstract
Objective: To investigate the diagnostic value of D-dimer, ESR and CRP in deep vein thrombosis (DVT) of lower extremity after hip and knee replacement.Methods: Clinical data of 216 patients who underwent hip and knee replacement in our hospital from January 2018 to November 2020 were retrospectively analyzed. Among them, there were 86 patients with lower extremity deep vein thrombosis and 130 patients without lower extremity deep vein thrombosis. Preoperative blood D-dimer, prothrombin time, fibrinogen content, erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), albumin and hemoglobin levels were collected. Chi-square test was used to compare the rate of deep vein thrombosis in lower limbs. The PSM propensity score matching method was used to select 86 patients from 130 patients without lower extremity deep vein thrombosis (DVT) as control group. The levels of D-dimer, albumin and hemoglobin in 172 patients were compared, and the diagnostic efficacy of D-dimer, ESR and CRP in the diagnosis of lower extremity deep vein thrombosis after hip and knee replacement was analyzed by ROC curve.Results: ROC curve analysis results showed that: The optimal cut-off values of D-dimer, prothrombin time, ESR, CRP and age for the diagnosis of DVT of lower extremity after hip replacement were 1.745mg/L, 10.850s, 15.500mm/h, 2.375mg/L and 72 years old, respectively. The sensitivity was 71.8%, 66.7%, 61.5%, 94.9%, 71.8%, the specificity was 74.1%, 66.7%, 70.4%, 33.3%, 100%, and the area under the curve was 0.746, 0.683, 0.658, 0.651, 0.869. The optimal truncation value of D-dimer for the diagnosis of DVT of lower extremity after knee replacement was 0.285mg/L, the sensitivity was 78.7%, the specificity was 44.1%, and the area under the curve was 0.622.Conclusion: The diagnostic value of D-dimer in the formation of lower extremity DVT after knee arthroplasty is higher than that after hip arthroplasty, but the diagnostic value of prothrombin time, ESR, CRP and age in the formation of lower extremity DVT after hip arthroplasty is higher than that after knee arthroplasty.