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Related Concept Videos

Corrosion02:49

Corrosion

25.6K
The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
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Corrosion of Reinforcement01:27

Corrosion of Reinforcement

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The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
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Potentiodynamic Corrosion Testing
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Do total shoulder arthroplasty implants corrode?

Alexander L Hornung1, Deborah J Hall1, Mable Je1

  • 1Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA.

Journal of Shoulder and Elbow Surgery
|June 7, 2022
PubMed
Summary
This summary is machine-generated.

Corrosion occurs in total shoulder arthroplasty (TSA) implants, with greater damage at the head taper. Minimizing corrosion risk involves eliminating preferential corrosion sites and ensuring distal engagement of implant components.

Keywords:
Taper corrosioncolumn damageimplant wearmaterial lossrevisionshoulder arthroplasty

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science
  • Implant Corrosion Research

Background:

  • Total shoulder arthroplasty (TSA) is a standard treatment for glenohumeral osteoarthritis.
  • Concerns exist regarding metal debris from fretting corrosion in TSA, similar to total hip arthroplasty.
  • The frequency and impact of corrosion in TSA implants remain unclear.

Purpose of the Study:

  • To characterize and quantify corrosion and fretting damage in a specific anatomic TSA design.
  • To compare corrosion outcomes in TSA to those observed in total hip arthroplasty.
  • To identify factors influencing corrosion and fretting damage in TSA components.

Main Methods:

  • Analysis of 21 surgically retrieved anatomic TSA components (Tornier Aequalis Pressfit).
  • Microscopic examination, optical coordinate-measuring machine analysis, scanning electron microscopy, and energy-dispersive x-ray spectroscopy.
  • Statistical analysis including t-tests, Mann-Whitney tests, and multivariate linear regression.

Main Results:

  • Significant material loss observed at head tapers (0.007 mm³) compared to stem tapers (0.001 mm³).
  • Column damage, associated with preferential corrosion sites, correlated with greater volumetric material loss.
  • Proximal engagement of implant components increased the likelihood of column damage.

Conclusions:

  • Metal components in TSA implants are susceptible to corrosion.
  • Reducing corrosion risk requires eliminating preferential corrosion sites within the alloy.
  • Ensuring distal engagement of the modular junction is crucial to prevent fluid infiltration and subsequent corrosion.