title: Association between psoas abscess and prosthetic hip infection: a case-control study.
abstract: OBJECTIVE
  The relationship between prosthetic hip infection and a psoas abscess is poorly documented. We determined the frequency of prosthetic hip infections associated with psoas abscesses and identified their determinants.
  
  
  METHODS
  We conducted a 2-year observational study. Data from patients with psoas abscesses that were associated with prosthetic hip infections were examined in a case-control study.
  
  
  RESULTS
  Of 106 patients admitted to the Infectious Diseases Department with prosthetic hip infection, 13 also had a psoas abscess (12%; 95% CI: 6-19). By conditional logistic regression analysis, psoas abscesses were observed more frequently in cases of hematogenous prosthetic infections (OR = 93, p = 0.06) and in patients with a history of neoplasm (OR = 20, p = 0.03).
  
  
  CONCLUSIONS
  Our results suggest that the presence of psoas abscesses is a frequent but under-diagnosed complication of prosthetic hip infection. We recommend that an abdominal CT scan be performed on patients with hematogenous prosthetic hip infection or with a history of neoplasm.
authors.affiliation: Department of Infectious Diseases Tropical Medicine, Hôpital Pellegrin, CHU de Bordeaux, Université Bordeaux 2, France.
authors.forename: Frédéric-Antoine
authors.initials: FA
authors.lastname: Dauchy
authors.forename: Michel
authors.initials: M
authors.lastname: Dupon
authors.forename: Hervé
authors.initials: H
authors.lastname: Dutronc
authors.forename: Bertille
authors.initials: B
authors.lastname: de Barbeyrac
authors.forename: Sylvie
authors.initials: S
authors.lastname: Lawson-Ayayi
authors.forename: Vincent
authors.initials: V
authors.lastname: Dubuisson
authors.forename: Vincent
authors.initials: V
authors.lastname: Souillac
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011475:Prosthesis Failure; D016459:Prosthesis-Related Infections / Q000209:etiology* / Q000382:microbiology; D016659:Psoas Abscess / Q000150:complications* / Q000000981:diagnostic imaging / Q000382:microbiology; D012086:Reoperation; D012189:Retrospective Studies; D012307:Risk Factors; D014057:Tomography, X-Ray Computed