髋关节置换 隐性失血 关节成形 因素分析 循环血量 体质量指数(BMI) 疾病类型 下肢深静脉血栓 置换后抗凝方式 假体类型 total hip arthroplasty hidden blood loss arthroplasty factors analysis circulating blood volume body mass index (BMI) type of disease deep vein thrombosis anticoagulation method type of prosthesis