Advertisement

The value of serial metal ion levels in following up patients with metal-on-metal hip arthroplasty

Abstract

Background

The sensitivity of cobalt (Co) and chromium (Cr) ion-levels in detecting poorly performing metal-on-metal hip implants is low. This study proposes that serial changes in ion-levels are a more accurate marker of arthroplasties at risk.

Methods

Serial metal ion-levels and implant data of 285 patients with ASR resurfacing or replacement were studied. Patient and implant characteristics were analysed using univariate and multivariate analyses.

Results

111 (39%) had revision surgery. Time since index surgery (p<0.001), acetabular inclination (p<0.001), their interaction (p<0.001) and femoral head size (p = 0.01) were significant variables. Head size (≤51 mm) had lower Co and Cr levels (p = 0.01). Cr/Co showed marginal decrease over time in the unrevised group and no decrease prerevision.

Conclusions

Repeated measurement of ion-levels were higher in the revision group suggesting that serial measurements rather than absolute values may have a role to play in predicting implant failure.

Hip Int 2017; 27(1): 14 - 20

Article Type: ORIGINAL RESEARCH ARTICLE

DOI:10.5301/hipint.5000432

Authors

Gavin McHugh, Rajiv Merchant, Gabrielle E. Kelly, Karen M. Bergin, Gerald F. McCoy, Andrew P. Wozniak, John F. Quinlan

Article History

Disclosures

Financial support: None.
Conflict of interest: None.

This article is available as full text PDF.

  • If you are a Subscriber, please log in now.

  • Article price: Eur 36,00
  • You will be granted access to the article for 72 hours and you will be able to download any format (PDF or ePUB). The article will be available in your login area under "My PayPerView". You will need to register a new account (unless you already own an account with this journal), and you will be guided through our online shop. Online purchases are paid by Credit Card through PayPal.
  • If you are not a Subscriber you may:
  • Subscribe to this journal
  • Unlimited access to all our archives, 24 hour a day, every day of the week.

Authors

Affiliations

  • Lourdes Orthopaedic Hospital, Kilcreene, Kilkenny - Ireland
  • School of Mathematical Sciences, University College Dublin, Dublin - Ireland

Article usage statistics

The blue line displays unique views in the time frame indicated.
The yellow line displays unique downloads.
Views and downloads are counted only once per session.

No supplementary material is available for this article.