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J Arthroplasty. 2012 Aug;27(7):1358-1363.e1. doi: 10.1016/j.arth.2011.09.031. Epub 2012 Jan 5.

Periacetabular cortical and cancellous bone mineral density loss after press-fit cup fixation: a prospective 7-year follow-up.

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  • 1Department of Orthopaedic Surgery, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany.

Abstract

The impact of total hip arthroplasty on strain adaptive bone remodeling has been extensively analyzed by dual-energy x-ray absorptiometry. In this study, we present a prospective computed tomography-assisted study of periacetabular cortical and cancellous bone mineral density (in milligrams of calcium hydroxyapatite [CaHA] per milliliter, or mgCaHA/mL) changes 10 days and 1, 3, and 7 years after press-fit cup implantation for 38 hips in vivo. Cancellous bone mineral density decreased by Ø -63% ventral and Ø -85% dorsal to the cup; cortical bone mineral density, by Ø -22% ventral and Ø -18% dorsal to the cup. The presented periacetabular strain adaptive bone mineral density data are the most extensive of the current literature. Even the measured extensive cancellous bone mineral density loss was thus far of no clinical relevance because all cups showed radiographic signs of stable ingrowth.

Copyright © 2012 Elsevier Inc. All rights reserved.

PMID:
22226614
[PubMed - indexed for MEDLINE]
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