Bone Remodeling Around Porous Metal Cementless Acetabular Components
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.
Keywords: bone mineral density, total hip arthroplasty, cementless, quantitative computed tomography, porous tantalum, bone-remodeling
To access this article, please choose from the options below
While the authors did not receive any benefits for this part of the study, benefits were received by Implex for the original study from which this cohort was taken. Therefore, it should be noted that benefits were received in support of this study from Implex. Also it should be noted that one or more of the authors have received royalties and payments from Implex/Zimmer.
PII: S0883-5403(09)00127-2
doi:10.1016/j.arth.2009.04.025
© 2010 Elsevier Inc. All rights reserved.
