Bone Remodeling Around Porous Metal Cementless Acetabular Components

R. Michael Meneghini, Kerry S. Ford, Cynthia H. McCollough, Arlen D. Hanssen, David G. Lewallen

Research output: Contribution to journalArticle

84 Scopus citations

Abstract

Bone remodeling around cementless acetabular components after total hip arthroplasty has not been well characterized. A randomized, prospective study of total hip arthroplasty was performed comparing 2 cementless acetabular implants: a solid titanium and a more elastic porous tantalum design. Seventeen hips (9 porous tantalum, 8 titanium) underwent quantitative computed tomography at mean of 7.7 years, and adjacent bone mineral density (BMD) was calculated. The absolute and relative decrease in BMD from preoperative level was less in zones 9 to 15 mm adjacent to the porous tantalum compared to the titanium component (P ≤ .02) and predominated posterosuperiorly. The relative BMD increased in all regions adjacent to the porous tantalum component from 5% to 40% over the control. This data demonstrates stress-shielding likely occurs less around a highly porous metal implant of material with an elastic modulus similar to bone.

Original languageEnglish (US)
Pages (from-to)741-747
Number of pages7
JournalJournal of Arthroplasty
Volume25
Issue number5
DOIs
StatePublished - Aug 1 2010
Externally publishedYes

Keywords

  • Bone mineral density
  • Bone-remodeling
  • Cementless
  • Porous tantalum
  • Quantitative computed tomography
  • Total hip arthroplasty

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

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