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Irish Journal of Medical Science (1971 -)

, Volume 188, Issue 1, pp 149–153 | Cite as

Femoral offset found not to affect metal ion levels in metal-on-metal total hip arthroplasty

  • Eoghan PomeroyEmail author
  • Fergal Macnamara
  • Evelyn Murphy
  • Niall McGoldrick
  • Anant Mahapatra
  • Nasir Awan
Original Article

Abstract

Background

Failure to restore femoral offset in metal on polyethylene total hip arthroplasty (THA) causes polyethylene wear and aseptic loosening. To our knowledge, no study to date has investigated the relationship between femoral offset and wear in metal-on-metal (MOM) THA.

Aims

In this study, we investigated the relationship between femoral offset and wear by measuring circulating metal ion levels in MOM THA.

Methods

In this retrospective study, we identified patients who had undergone MOM THA with the ASR XL system (DePuy International Ltd., Leeds, UK). Femoral offset was measured using anteroposterior radiographs, and circulating metal ion levels (cobalt and chromium) were recorded.

Results

In total, 95 patients were included (68 males and 27 females). The mean age at the time of surgery was 64.9. Mean time from surgery to blood sampling was 15.4 months. No statistically significant relationship was found between femoral offset and cobalt (p = 0.313) or chromium (p = 0.401) ions.

Conclusion

It is known that failure to restore femoral offset during THA can lead to high rates of wear in metal-on-polyethylene articulations. In our study, no statistically significant relationship was found between femoral offset and serum cobalt or chromium ions. This study adds to the information available to surgeons regarding factors that increase wear in metal-on-metal total hip arthroplasty.

Keywords

Chromium Cobalt Femoral offset Metal ions Metal-on-metal Total hip arthroplasty 

Notes

Acknowledgements

The authors would like to thank Paula Blake, orthopedic nurse at Our Lady’s Hospital, who worked tirelessly in assisting us with data collection and patient identification.

Compliance with ethical standards

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

Prior to undertaking this study, the local institutional review board was consulted. As it is a retrospective study, the decision was made that formal consent was not required.

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Royal Academy of Medicine in Ireland 2018

Authors and Affiliations

  • Eoghan Pomeroy
    • 1
    Email author
  • Fergal Macnamara
    • 2
  • Evelyn Murphy
    • 1
  • Niall McGoldrick
    • 1
  • Anant Mahapatra
    • 2
  • Nasir Awan
    • 2
  1. 1.Department of Trauma and OrthopaedicsCappagh National Orthopaedic HospitalDublinIreland
  2. 2.Department of Trauma and OrthopaedicsOur Lady’s HospitalNavanIreland

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