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Stronach BM, Roach MD, St John KR. Failure of Emperion modular femoral stem with implant analysis. Arthroplast Today. 2016;2(1):11-14doi: 10.1016/j.artd.2015.11.004.
Stronach, B. M., Roach, M. D., & St John, K. R. (2016). Failure of Emperion modular femoral stem with implant analysis. Arthroplasty today, 2(1), 11-14. https://doi.org/10.1016/j.artd.2015.11.004
Stronach, Benjamin M, et al. "Failure of Emperion modular femoral stem with implant analysis." Arthroplasty today vol. 2,1 (2016): 11-14. doi: https://doi.org/10.1016/j.artd.2015.11.004
Stronach BM, Roach MD, St John KR. Failure of Emperion modular femoral stem with implant analysis. Arthroplast Today. 2016 Jan 11;2(1):11-14. doi: 10.1016/j.artd.2015.11.004. eCollection 2016 Mar. PMID: 28326390; PMCID: PMC4957168.
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Arthroplast Today. 2016 Jan 11;2(1):11-14. doi: 10.1016/j.artd.2015.11.004. eCollection 2016 Mar.

Failure of Emperion modular femoral stem with implant analysis.

Arthroplasty today

Benjamin M Stronach, Michael D Roach, Kenneth R St John

Affiliations

  1. Department of Orthopaedic Surgery, University of Mississippi Medical Center, Jackson, MS, USA.
  2. Department of Biomedical Materials Science, University of Mississippi Medical Center, Jackson, MS, USA.

PMID: 28326390 PMCID: PMC4957168 DOI: 10.1016/j.artd.2015.11.004

Abstract

Modularity in total hip arthroplasty provides multiple benefits to the surgeon in restoring the appropriate alignment and position to a previously damaged hip joint. The vast majority of modern implants incorporate modularity into their design with some implants having multiple modular interfaces. There is the potential for failure at modular junctions because of fretting and crevice corrosion in combination with mechanical loading. This case report details the failure of an Emperion (Smith and Nephew, Memphis, TN) femoral stem in a 67-year-old male patient 6 years after total hip replacement. Analysis of the implant revealed mechanically assisted crevice corrosion that likely accelerated fatigue crack initiation in the hip stem. The benefits of modularity come with the potential drawback of a combination of fretting and crevice corrosion at the modular junction, which may accelerate fatigue, crack initiation and ultimately reduce the hip longevity.

Keywords: Corrosion; Femoral stem; Hip; Implant failure; Modular

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