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Bioactive materials driven primary stability on titanium biocomposites.

T A Dantas1, C S Abreu2, M M Costa1

  • 1CMEMS-UMinho - Center for Microelectromechanical Systems, University of Minho, Azurém, 4800-058 Guimarães, Portugal.

Materials Science & Engineering. C, Materials for Biological Applications
|May 24, 2017
PubMed
Summary
This summary is machine-generated.

Polished titanium alloy biocomposites with hydroxyapatite (HAp) or tricalcium phosphate (TCP) show improved implant stability. This study challenges traditional rough surfaces, suggesting polished surfaces enhance primary fixation in total hip arthroplasty (THA).

Keywords:
BiocompositesBiotribologyFrictionImplantsPrimary stabilityTitanium

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Area of Science:

  • Biomaterials Science
  • Orthopedic Engineering
  • Tribology

Background:

  • Titanium alloy (Ti6Al4V) is a common choice for total hip arthroplasty (THA) due to its mechanical properties.
  • Ti6Al4V lacks inherent bioactivity, necessitating coatings like hydroxyapatite (HAp) and tricalcium phosphate (TCP) for bone integration.
  • Surface metal matrix composites offer a promising route to enhance the bioactivity and bonding of titanium implants.

Purpose of the Study:

  • To investigate the tribological performance of Ti6Al4V-HAp and Ti6Al4V-TCP biocomposites.
  • To evaluate the frictional response and surface damage of these composites against bone tissue.
  • To determine the impact of surface roughness on implant stability for total hip arthroplasty applications.

Main Methods:

  • Biocomposites (10vol% β-TCP or 10vol% HAp in Ti6Al4V) were fabricated using hot pressing (HP).
  • Two surface finishing conditions were prepared: polished (Ra=0.3-0.5μm) and sandblasted (Ra=2.1-2.5μm).
  • Tribological testing was conducted using bovine cortical bone as the counter-surface.

Main Results:

  • Static friction increased with surface roughness for the biocomposites.
  • Kinetic friction showed an inverse trend with surface roughness.
  • Polished surfaces demonstrated improved primary implant stability compared to rough surfaces.

Conclusions:

  • Contrary to conventional approaches, polished Ti6Al4V-HAp or Ti6Al4V-TCP biocomposite surfaces enhance primary implant stability.
  • The bioadhesive properties of HAp/β-TCP are expected to improve secondary implant stability.
  • These findings suggest a novel design strategy for more stable total hip arthroplasty implants.