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Related Concept Videos

Microcracking in Concrete01:20

Microcracking in Concrete

Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...

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Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
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Published on: September 29, 2019

Technique to quantify subsurface cracks in retrieved polyethylene components using micro-CT.

Matthew G Teeter1, Xunhua Yuan, Douglas D R Naudie

  • 1Imaging Research Laboratories, Robarts Research Institute, London, Ontario, Canada. mteeter@imaging.robarts.ca

Journal of Long-Term Effects of Medical Implants
|February 3, 2011
PubMed
Summary
This summary is machine-generated.

Micro-computed tomography (micro-CT) offers a new, nondestructive way to find and measure subsurface cracks in polyethylene joint replacements. This advanced imaging technique aids in understanding implant wear and damage.

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Area of Science:

  • Biomaterials Science
  • Medical Imaging
  • Orthopedic Engineering

Background:

  • Current methods for assessing polyethylene joint component damage lack accuracy, non-destructiveness, and quantitative measurement capabilities.
  • Studying subsurface damage, such as delamination and cracking, is crucial for understanding implant longevity and failure modes.

Purpose of the Study:

  • To develop and validate a micro-computed tomography (micro-CT) technique for the nondestructive examination and quantification of subsurface cracking in retrieved polyethylene tibial inserts.
  • To assess the feasibility of micro-CT in visualizing and measuring crack dimensions and locations within polyethylene components.

Main Methods:

  • Retrieval of five delaminated and two never-implanted polyethylene tibial inserts from an implant retrieval library.
  • Scanning of retrieved inserts using micro-computed tomography (micro-CT).
  • Analysis of micro-CT images to identify, locate, and measure the widths of subsurface cracks using a digital line tool.

Main Results:

  • Subsurface cracks were clearly visualized exclusively in the delaminated polyethylene inserts.
  • Identified cracks exhibited horizontal orientations beneath the articular and back-side surfaces, and vertical orientations at the center, lateral edges, and tibial post.
  • Measured crack depths ranged from 0.12 to 6.01 mm, with widths varying from 0.06 to 0.97 mm.

Conclusions:

  • Micro-computed tomography (micro-CT) provides a reliable, nondestructive method for visualizing and quantifying subsurface cracks in polyethylene joint replacement components.
  • This technique enhances previous applications of micro-CT for wear analysis, offering a comprehensive approach to implant damage assessment.
  • Micro-CT is suitable for both analyzing retrieved components and for longitudinal studies using wear simulator trials.