Multivariate logistic regression analysis results (Fig. 5a, b) showed that delayed anticoagulation, lung infection, COPD, waiting for more than 7 days before surgery, anemia, hypoproteinemia, high energy trauma, multiple injuries, comminuted fractures, history of drinking, CRP and Fbg levels on the first day after surgery, HB, and CRP and Fbg levels on the 3rd day after surgery were independent risk factors for DVT in patients with femoral and pelvic fractures (P < 0.05). Here, CRP is linked to chronic obstructive pulmonary disease.