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Does Increased Coefficient of Friction of Highly Porous Metal Increase Initial Stability at the Acetabular Interface?

Publication ,  Journal Article
Goldman, AH; Armstrong, LC; Owen, JR; Wayne, JS; Jiranek, WA
Published in: J Arthroplasty
March 2016

BACKGROUND: Highly porous metal acetabular components illustrate a decreased rate of aseptic loosening in short-term follow-up compared with previous registry data. This study compared the effect of component surface roughness at the bone-implant interface and the quality of the bone on initial pressfit stability. The null hypothesis is that a standard porous coated acetabular cup would show no difference in initial stability as compared with a highly porous acetabular cup when subjected to a bending moment. Second, would bone mineral density (BMD) be a significant variable under these test conditions. METHODS: In a cadaveric model, acetabular cup micromotion was measured during a 1-time cantilever bending moment applied to 2 generations of pressfit acetabular components. BMD data were also obtained from the femoral necks available for associated specimen. RESULTS: The mean bending moment at 150 μm was not found to be significantly different for Gription (24.6 ± 14.0 N m) cups vs Porocoat (25 ± 10.2 N m; P > .84). The peak bending moment tolerated by Gription cups (33.9 ± 20.3 N m) was not found to be significantly different from Porocoat (33.5 ± 12.2 N m; P > .92). No correlation between BMD and bending moment at 150 μm of displacement could be identified. CONCLUSION: The coefficient of friction provided by highly porous metal acetabular shells used in this study did not provide better resistance to migration under bending load when compared with a standard porous coated component.

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Published In

J Arthroplasty

DOI

EISSN

1532-8406

Publication Date

March 2016

Volume

31

Issue

3

Start / End Page

721 / 726

Location

United States

Related Subject Headings

  • Prosthesis Failure
  • Prosthesis Design
  • Porosity
  • Orthopedics
  • Metals
  • Male
  • Humans
  • Hip Prosthesis
  • Friction
  • Female
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Goldman, A. H., Armstrong, L. C., Owen, J. R., Wayne, J. S., & Jiranek, W. A. (2016). Does Increased Coefficient of Friction of Highly Porous Metal Increase Initial Stability at the Acetabular Interface? J Arthroplasty, 31(3), 721–726. https://doi.org/10.1016/j.arth.2015.10.012
Goldman, Ashton H., Lucas C. Armstrong, John R. Owen, Jennifer S. Wayne, and William A. Jiranek. “Does Increased Coefficient of Friction of Highly Porous Metal Increase Initial Stability at the Acetabular Interface?J Arthroplasty 31, no. 3 (March 2016): 721–26. https://doi.org/10.1016/j.arth.2015.10.012.
Goldman AH, Armstrong LC, Owen JR, Wayne JS, Jiranek WA. Does Increased Coefficient of Friction of Highly Porous Metal Increase Initial Stability at the Acetabular Interface? J Arthroplasty. 2016 Mar;31(3):721–6.
Goldman, Ashton H., et al. “Does Increased Coefficient of Friction of Highly Porous Metal Increase Initial Stability at the Acetabular Interface?J Arthroplasty, vol. 31, no. 3, Mar. 2016, pp. 721–26. Pubmed, doi:10.1016/j.arth.2015.10.012.
Goldman AH, Armstrong LC, Owen JR, Wayne JS, Jiranek WA. Does Increased Coefficient of Friction of Highly Porous Metal Increase Initial Stability at the Acetabular Interface? J Arthroplasty. 2016 Mar;31(3):721–726.
Journal cover image

Published In

J Arthroplasty

DOI

EISSN

1532-8406

Publication Date

March 2016

Volume

31

Issue

3

Start / End Page

721 / 726

Location

United States

Related Subject Headings

  • Prosthesis Failure
  • Prosthesis Design
  • Porosity
  • Orthopedics
  • Metals
  • Male
  • Humans
  • Hip Prosthesis
  • Friction
  • Female