title: [Case-control study on influence of femoral neck fracture on deep venous thrombosis in patients undergoing prosthetic hip surgery].
abstract: OBJECTIVE
  To investigate the association between femoral neck fracture and deep vein thrombosis (DVT) in patients undergoing prosthetic hip surgery.
  
  
  METHODS
  The data of patients who underwent prosthetic hip surgery from January 2005 to July 2010 were collected, the cases were included into the study after exclusion of those could not be suitable for the study. The patients with diagnosis of deep-vein thrombosis (DVT) were identified together as the case group, and the patients without DVT were selected randomly and matched with frequency as the control group. The matching characteristics included age, gender and body weight. The patients with femoral neck fracture were counted in both case and control group. The odds ratio was calculated and the exposure rate of both group were compared.
  
  
  RESULTS
  There were total 670 patients underwent prosthetic hip surgery during the period, and after exclusion,the data of 408 patients were collected into the study. There were 13 patients in the case group (4 males and 9 females, ranging in age fram 57 to 91 years), all of them suffering from femoral neck fracture and the exposure rate was 100.0% (13/13). There were 52 patients in the control group (18 males and 34 females, ranging in age from 57 to 91 years), 39 of them suffering from femoral neck fracture, the exposure rate was 75.0% (39/52); there was no statistically significant difference in exposure rate of two groups.
  
  
  CONCLUSIONS
  The diagnosis of femoral neck fracture is not the independent risk factor for postoperative DVT of prosthetic hip surgery. The epidemiologic characteristics of femoral neck fracture indicate that the patients are in high risk of DVT, who meanwhile are the most of patients undergoing the prosthetic hip surgery. Though the surgery itself is a risk of DVT, it can reduce the risks for patients with femoral neck fracture through some therapeutic effects.
authors.affiliation: Department of Orthopaedics, Peking Union Medical Hospital Affiliated to Peking Union Medical College, Chinese Academy of Sciences, Beijing 100730, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Chang
authors.forename: Wen-Wei
authors.initials: WW
authors.lastname: Qian
authors.forename: Xi-Sheng
authors.initials: XS
authors.lastname: Weng
authors.forename: Bao-Zhong
authors.initials: BZ
authors.lastname: Zhang
authors.forename: Jin
authors.initials: J
authors.lastname: Lin
authors.forename: Jin
authors.initials: J
authors.lastname: Jin
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D016022:Case-Control Studies; D005260:Female; D005265:Femoral Neck Fractures / Q000150:complications*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D020246:Venous Thrombosis / Q000209:etiology*