Relationship between femoral offset and dislocation in preformed antibiotic-loaded cement spacers (Spacer-G®)



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.

Materials and 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.


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).


In conclusion, the preformed spacer decreased LFO but not MVFO compared with the contralateral hip. The variations did not significantly affect the dislocation rate.

Hip Int 2017; 27(5): 494 - 499




Ignacio Molinas, Ester Garcia-Oltra, Jenaro A. Fernández-Valencia, Xavier Tomas, Xavier Gallart, Josep Riba, Andreu Combalia, Guillem Bori

Article History


Financial support: None.
Conflict of interest: None.

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  • 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
  • Department of Radiology, Hospital Clinic of Barcelona, University of Barcelona, Barcelona - Spain

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