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Related Concept Videos

Knee Joint01:23

Knee Joint

The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris group...

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Potentiodynamic Corrosion Testing
08:43

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Published on: September 4, 2016

CoCrMo metal-on-metal hip replacements.

Yifeng Liao1, Emily Hoffman, Markus Wimmer

  • 1Department of Materials Science and Engineering, Northwestern University, Evanston, IL, USA.

Physical Chemistry Chemical Physics : PCCP
|December 1, 2012
PubMed
Summary
This summary is machine-generated.

Metal-on-metal hip implants face scrutiny due to wear and corrosion. Understanding these CoCrMo implant interactions is crucial for patient safety and improved joint replacement design.

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Area of Science:

  • Biomaterials Science
  • Orthopedic Surgery
  • Tribology

Background:

  • Metal-on-metal hip replacements (CoCrMo) saw increased use but declined due to biocompatibility concerns.
  • Wear and corrosion debris from these implants raise significant concerns about local tissue response.
  • The in vivo and in vitro interactions between CoCrMo bearings and the human body remain poorly understood.

Purpose of the Study:

  • To review recent advancements in understanding the wear and corrosion of metal-on-metal hip replacements.
  • To discuss key factors influencing implant performance, including materials, deformation, and tribocorrosion.
  • To highlight open questions and potential adverse health effects associated with implant wear products.

Main Methods:

  • Review of in vivo and in vitro studies on CoCrMo hip implant wear and corrosion.
  • Discussion of material properties, mechanical deformation, and electrochemical corrosion processes.
  • Analysis of wear-assisted corrosion mechanisms and the characterization of wear products.

Main Results:

  • CoCrMo metal-on-metal hip implants generate wear and corrosion debris.
  • These debris particles can elicit adverse local tissue reactions.
  • The complex chemistry of corrosion and tribochemical reactions requires further investigation.

Conclusions:

  • Further research is needed to fully elucidate the chemistry of corrosion and tribochemical reactions in CoCrMo hip implants.
  • Understanding these interactions is vital for improving the safety and longevity of artificial hip joints.
  • Designing advanced materials for human implants requires similar attention to performance as seen in automotive applications.