title: Relationship between femoral offset and dislocation in preformed antibiotic-loaded cement spacers (Spacer-G®).
abstract: BACKGROUND
  A reduction in femoral offset may decrease muscle tension and lead to spacer dislocations even though proximal femur, musculature and acetabulum remain intact. In this study, we aimed to determine whether postoperative lateral femoral offset (LFO) and modified vertical femoral offset (MVFO) values affect the risk of dislocation of a hip spacer.
  
  
  METHODS
  We measured LFO and MVFO in properly centred, postoperative, anteroposterior radiographs of the pelvis in 66 patients (71 spacers). We then compared the operated and non-operated sides and recorded any dislocations.
  
  
  RESULTS
  Although LFO decreased (p<0.001), the reduction was not associated with dislocation (p = 0.471). MVFO remained unchanged after spacer implantation (p = 0.277) and was not associated with dislocation (p = 0.418).
  
  
  CONCLUSIONS
  In conclusion, the preformed spacer decreased LFO but not MVFO compared with the contralateral hip. The variations did not significantly affect the dislocation rate.
authors.affiliation: Department of Orthopaedic and Trauma Surgery, Hospital Clinic of Barcelona, University of Barcelona, Barcelona - Spain.|Bone and Joint Infectious Diseases Unit, Hospital Clinic of Barcelona, University of Barcelona, Barcelona - Spain.
authors.forename: Ignacio
authors.initials: I
authors.lastname: Molinas
authors.affiliation: Department of Orthopaedic and Trauma Surgery, Hospital Clinic of Barcelona, University of Barcelona, Barcelona - Spain.|Bone and Joint Infectious Diseases Unit, Hospital Clinic of Barcelona, University of Barcelona, Barcelona - Spain.
authors.forename: Ester
authors.initials: E
authors.lastname: Garcia-Oltra
authors.affiliation: Department of Orthopaedic and Trauma Surgery, Hospital Clinic of Barcelona, University of Barcelona, Barcelona - Spain.|Bone and Joint Infectious Diseases Unit, Hospital Clinic of Barcelona, University of Barcelona, Barcelona - Spain.|Institute of Biomedical Research August Pi i Sunyer (IDIBAPS), Barcelona - Spain.
authors.forename: Jenaro A
authors.initials: JA
authors.lastname: Fernández-Valencia
authors.affiliation: Bone and Joint Infectious Diseases Unit, Hospital Clinic of Barcelona, University of Barcelona, Barcelona - Spain.|Institute of Biomedical Research August Pi i Sunyer (IDIBAPS), Barcelona - Spain.|Department of Radiology, Hospital Clinic of Barcelona, University of Barcelona, Barcelona - Spain.
authors.forename: Xavier
authors.initials: X
authors.lastname: Tomas
authors.affiliation: Department of Orthopaedic and Trauma Surgery, Hospital Clinic of Barcelona, University of Barcelona, Barcelona - Spain.|Bone and Joint Infectious Diseases Unit, Hospital Clinic of Barcelona, University of Barcelona, Barcelona - Spain.|Institute of Biomedical Research August Pi i Sunyer (IDIBAPS), Barcelona - Spain.
authors.forename: Xavier
authors.initials: X
authors.lastname: Gallart
authors.affiliation: Department of Orthopaedic and Trauma Surgery, Hospital Clinic of Barcelona, University of Barcelona, Barcelona - Spain.|Bone and Joint Infectious Diseases Unit, Hospital Clinic of Barcelona, University of Barcelona, Barcelona - Spain.|Institute of Biomedical Research August Pi i Sunyer (IDIBAPS), Barcelona - Spain.
authors.forename: Josep
authors.initials: J
authors.lastname: Riba
authors.affiliation: Department of Orthopaedic and Trauma Surgery, Hospital Clinic of Barcelona, University of Barcelona, Barcelona - Spain.|Bone and Joint Infectious Diseases Unit, Hospital Clinic of Barcelona, University of Barcelona, Barcelona - Spain.|Institute of Biomedical Research August Pi i Sunyer (IDIBAPS), Barcelona - Spain.
authors.forename: Andreu
authors.initials: A
authors.lastname: Combalia
authors.affiliation: Department of Orthopaedic and Trauma Surgery, Hospital Clinic of Barcelona, University of Barcelona, Barcelona - Spain.|Bone and Joint Infectious Diseases Unit, Hospital Clinic of Barcelona, University of Barcelona, Barcelona - Spain.|Institute of Biomedical Research August Pi i Sunyer (IDIBAPS), Barcelona - Spain.
authors.forename: Guillem
authors.initials: G
authors.lastname: Bori
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging / Q000601:surgery*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging / Q000601:surgery*; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D004204:Joint Dislocations / Q000175:diagnosis / Q000209:etiology / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D016459:Prosthesis-Related Infections / Q000175:diagnosis / Q000209:etiology / Q000628:therapy*; D011859:Radiography
chemical_list: D000900:Anti-Bacterial Agents