title: The preoperative incidence of deep vein thrombosis (DVT) and its correlation with postoperative DVT in patients undergoing elective surgery for femoral neck fractures.
abstract: BACKGROUND
  Data on the incidence of preoperative deep vein thrombosis (DVT) in patients, who are waiting for elective hip replacement for femoral neck fractures, are limited. Our primary goal was to determine the prevalence and risk factors of preoperative DVT in acute hip fracture patients awaiting hemi- or total hip arthroplasty using venography. The secondary objective was to find a possible relationship between preoperative and postoperative DVT.
  
  
  METHODS
  We enrolled 119 consecutive patients with subcapital femoral neck fracture, who were awaiting hip replacement at our institution. All of them received venography before and after surgery. We used univariate analysis and multivariate logistic regression analysis to identify the risk factors for preoperative DVT.
  
  
  RESULTS
  Of the patients, 35 patients (29.4 %) developed DVT in affected limbs before surgery. Both long duration of immobilization and increased level of D-dimer were associated with preoperative DVT independently. Intriguingly, 66.7 % of patients who were diagnosed with DVT after surgery had thrombus in the same location, as they did before surgery.
  
  
  CONCLUSIONS
  We identified the high incidence and risk factors of preoperative DVT in patients awaiting elective surgery for femoral neck fractures. The majority of patients diagnosed with DVT postoperatively had already had thrombus before surgery.
authors.affiliation: Department of Sports Medicine and Adult Reconstruction, Drum Tower Hospital Affiliated to Medical School of Nanjing University, Zhongshan Road 321, Nanjing, 210008, Jiangsu, People's Republic of China.|Joint Research Centre for Bone and Joint Disease, Model Animal Research Center (MARC), Nanjing University, Xuefu Road, Nanjing, 210032, Jiangsu, People's Republic of China.|Centre for Orthopaedic Research, School of Surgery, The University of Western Australia, M508, 35 Stirling Hwy, Crawley, WA, 6009, Australia.
authors.forename: Kai
authors.initials: K
authors.lastname: Song
authors.affiliation: Department of Sports Medicine and Adult Reconstruction, Drum Tower Hospital Affiliated to Medical School of Nanjing University, Zhongshan Road 321, Nanjing, 210008, Jiangsu, People's Republic of China.|Joint Research Centre for Bone and Joint Disease, Model Animal Research Center (MARC), Nanjing University, Xuefu Road, Nanjing, 210032, Jiangsu, People's Republic of China.
authors.forename: Yao
authors.initials: Y
authors.lastname: Yao
authors.affiliation: Department of Sports Medicine and Adult Reconstruction, Drum Tower Hospital Affiliated to Medical School of Nanjing University, Zhongshan Road 321, Nanjing, 210008, Jiangsu, People's Republic of China.|Joint Research Centre for Bone and Joint Disease, Model Animal Research Center (MARC), Nanjing University, Xuefu Road, Nanjing, 210032, Jiangsu, People's Republic of China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Rong
authors.affiliation: Department of Sports Medicine and Adult Reconstruction, Drum Tower Hospital Affiliated to Medical School of Nanjing University, Zhongshan Road 321, Nanjing, 210008, Jiangsu, People's Republic of China.|Joint Research Centre for Bone and Joint Disease, Model Animal Research Center (MARC), Nanjing University, Xuefu Road, Nanjing, 210032, Jiangsu, People's Republic of China.
authors.forename: Yeshuai
authors.initials: Y
authors.lastname: Shen
authors.affiliation: Centre for Orthopaedic Research, School of Surgery, The University of Western Australia, M508, 35 Stirling Hwy, Crawley, WA, 6009, Australia. minghao.zheng@uwa.edu.au.
authors.forename: Minghao
authors.initials: M
authors.lastname: Zheng
authors.affiliation: Department of Sports Medicine and Adult Reconstruction, Drum Tower Hospital Affiliated to Medical School of Nanjing University, Zhongshan Road 321, Nanjing, 210008, Jiangsu, People's Republic of China. qingj@nju.edu.cn.|Joint Research Centre for Bone and Joint Disease, Model Animal Research Center (MARC), Nanjing University, Xuefu Road, Nanjing, 210032, Jiangsu, People's Republic of China. qingj@nju.edu.cn.
authors.forename: Qing
authors.initials: Q
authors.lastname: Jiang
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip; D017558:Elective Surgical Procedures; D005260:Female; D005265:Femoral Neck Fractures / Q000150:complications / Q000601:surgery*; D006801:Humans; D015994:Incidence; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D011183:Postoperative Complications / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology*; D057234:Preoperative Period; D015995:Prevalence; D012307:Risk Factors; D020246:Venous Thrombosis / Q000175:diagnosis / Q000453:epidemiology* / Q000209:etiology
keywords: Deep vein thrombosis; Elective surgery; Femoral neck fracture; Hip replacement