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Related Experiment Videos

Surface roughness quantification of CoCrMo implant alloys.

L Que1, L D Topoleski

  • 1Department of Mechanical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland 21250, USA.

Journal of Biomedical Materials Research
|September 22, 1999
PubMed
Summary

A new method using a white light interference surface profilometer helps measure uneven wear on artificial knee joints. Determining the representative measurement number (RMN) ensures accurate surface roughness analysis for CoCrMo alloy components.

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Area of Science:

  • Biomaterials Science
  • Orthopedic Engineering
  • Surface Metrology

Background:

  • CoCrMo alloy components in artificial knee joints experience uneven surface wear.
  • Reliable methods are needed to quantify this surface damage for improved implant longevity.

Purpose of the Study:

  • To develop and validate a measurement protocol for assessing surface roughness of CoCrMo alloy in artificial knee joints.
  • To determine the representative measurement number (RMN) for accurate surface roughness evaluation.

Main Methods:

  • Utilized white light interference surface profilometry to measure surface roughness (Ra, RMS) on in vitro wear specimens and retrieved femoral components.
  • Defined true surface roughness mean (TSRM) and representative measurement number (RMN) based on grid and random point measurements.

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Main Results:

  • Cumulative average surface roughness showed significant deviations from TSRM with few measurements but converged as the number increased.
  • The RMN was determined to be 40 points for third-body wear specimens and 20 points for retrieved femoral components.

Conclusions:

  • The TSRM provides a consistent measure of surface damage.
  • Defining the RMN is crucial for developing accurate measurement protocols to quantify wear and damage on artificial knee joint components.