Age, gender, BMI, surgical duration, time to surgery, anesthesia, anemia, blood transfusion history, smoking history, alcohol, hypertension, diabetes, cardiovascular and cerebrovascular diseases, pulmonary diseases, perioperative gastrointestinal bleeding, chronic anticoagulation, HB, HCT, albumin, type of posterior pelvic ring injury, fixed position, and depth were included in the analysis of possible influential factors of HBL in our study (Table 2). This evidence concerns the gene ALB and lung disorder.