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Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
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Do oxidized zirconium heads decrease tribocorrosion in total hip arthroplasty? A study of retrieved components.

C Hampton1, L Weitzler2, E Baral2

  • 1Hospital for Special Surgery, New York, New York, USA.

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Summary
This summary is machine-generated.

Oxidized zirconium (OxZr) femoral heads showed significantly less fretting and corrosion than cobalt-chromium (CoCr) heads after hip replacement surgery. This suggests OxZr is effective in reducing taper damage in retrieved implants.

Keywords:
Femoral headOxidized zirconium headsRetrieved componentsTotal hip arthroplastyTribocorrosion

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science
  • Materials Engineering

Background:

  • Taper corrosion and fretting are critical concerns in total hip arthroplasty (THA).
  • Oxidized zirconium (OxZr) is a modern bearing surface alternative to traditional cobalt-chromium (CoCr).
  • Understanding the long-term performance of OxZr in retrieved implants is crucial for patient outcomes.

Purpose of the Study:

  • To evaluate fretting and corrosion in retrieved OxZr femoral heads.
  • To compare these findings with a matched cohort of retrieved CoCr femoral heads.

Main Methods:

  • Retrieval analysis of 28 OxZr and 28 matched CoCr femoral heads from revision THA cases.
  • Assessment of fretting and corrosion using the modified Goldberg scoring method.
  • Matching of explants based on patient demographics and age at index surgery.

Main Results:

  • OxZr heads exhibited significantly lower mean corrosion scores (1.3 vs 2.1, p < 0.01) compared to CoCr heads.
  • OxZr heads also showed significantly lower mean fretting scores (1.3 vs 1.5, p = 0.02) than CoCr heads.
  • Damage in OxZr heads was more prevalent in the proximal region; location did not impact CoCr head damage.

Conclusions:

  • Retrieval analysis indicates reduced fretting and corrosion in OxZr femoral heads compared to CoCr.
  • Oxidized zirconium demonstrates efficacy in mitigating taper damage in retrieved hip arthroplasty components.
  • These findings support the use of OxZr as a durable material in THA.