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Midterm results of 36 mm metal-on-metal total hip arthroplasty

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Abstract

Background

Despite the many perceived benefits of metal-on-metal (MoM) articulation in total hip arthroplasty (THA), there have been growing concerns about metallosis and adverse reaction to metal debris (ARMD). Analysis of size 36 mm MoM articulation THAs is presented. These patients were evaluated for patient characteristics, relationship between blood metal ions levels and the inclination as well as the version of acetabular component, cumulative survival probability at final followup and functional outcome at final followup.

Materials and Methods

288, size 36 mm MoM THAs implanted in 269 patients at our institution from 2004 to 2010 were included in this retrospective study. These patients were assessed clinically for hip symptoms, perioperative complications and causes of revision arthroplasty were analysed. Biochemically, blood cobalt and chromium metal ions level were recorded and measurements of acetabular inclination and version were examined. Radiological evaluation utilizing Metal Artefact Reduction Sequence (MARS) MRI was undertaken and implant cumulative survivorship was evaluated.

Results

The mean followup was 5 years (range 2–7 years), mean age was 73 years and the mean Oxford hip score was 36.9 (range 5–48). Revision arthroplasty was executed in 20 (7.4%) patients, of which 15 patients underwent single-stage revision THA. The causes of revision arthroplasty were: ARMD changes in 6 (2.2%) patients, infection in 5 (1.9%) patients and aseptic loosening in 5 (1.9%) patients. Three (1.1%) patients had their hips revised for instability, 1 (0.3%) for raised blood metal ions levels. The implant cumulative survival rate, with revision for any reason, was 68.9% at 7 years.

Conclusions

Although medium-sized MoM THA with a 36 mm head has a marginally better survivorship at midterm followup, compared to larger size head MoM articulating THA, our findings nonetheless are still worryingly poor in comparison to what has been quoted in the literature. Furthermore, ARMD-related revision remains the predominant cause of failure in this cohort with medium-sized MoM articulation. No correlation was found between blood metal ions levels and the inclination as well as the version of acetabular component.

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Authors and Affiliations

  1. Department of Trauma and Orthopaedics, Mid Yorkshire Hospitals NHS Trust, Wakefeld, WF1 4DG, UK

    Hawar Akrawi, Fahad S. Hossain, Stefan Niculescu, Zaid Hashim, Arron Biing Ng & Ajit Shetty

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  1. Hawar Akrawi
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  2. Fahad S. Hossain
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Correspondence to Hawar Akrawi.

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Akrawi, H., Hossain, F.S., Niculescu, S. et al. Midterm results of 36 mm metal-on-metal total hip arthroplasty. IJOO 50, 256–262 (2016). https://doi.org/10.4103/0019-5413.181786

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  • DOI: https://doi.org/10.4103/0019-5413.181786

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