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Corrosion in Modular Revision Hip Stem Tapers - A Retrieval Analysis.

Therese Bormann1, Haolan Yan1, Sebastian Jaeger1

  • 1Research Center of Biomechanics and Implant Technology, Department of Orthopaedics, Heidelberg University Hospital, Germany.

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Summary

In revision hip arthroplasty, modular stems can degrade due to fretting and corrosion. Taper contamination, not fretting-corrosion itself, significantly impacts modular hip stem junction strength and longevity.

Keywords:
corrosion wearfretting wearfretting‐corrosionrevision surgerytaper failuretotal hip arthroplasty

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science
  • Mechanical Engineering

Background:

  • Modular hip stems offer intraoperative adjustability for complex cases.
  • Modular junctions risk degradation from corrosion and fretting, potentially leading to breakage.
  • Fretting-corrosion is a suspected precursor to junction failure but lacks systematic assessment.

Purpose of the Study:

  • To investigate the relationship between corrosion, fretting, and implant/patient parameters.
  • To assess the impact of these factors on modular hip stem connection strength.
  • To determine the role of taper contamination in junction degradation and strength.

Main Methods:

  • Analysis of 53 retrieved modular hip stems from various implant systems.
  • Rating of corrosion and fretting using a modified Goldberg score.
  • Assessment of taper contamination and measurement of push-out force for junction strength.

Main Results:

  • Corrosion and fretting were influenced by implantation time, taper contamination, body weight, and implant system.
  • Taper junction strength was significantly affected by taper contamination, but not by corrosion or fretting.
  • Implant geometry did not correlate with corrosive degradation; however, taper contamination increased corrosion.

Conclusions:

  • Taper contamination is a critical factor influencing corrosion at modular hip stem junctions.
  • Maintaining taper surface cleanliness during assembly is crucial for long-term modular implant stability.
  • While fretting-corrosion is a concern, taper contamination poses a more direct threat to junction strength.