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J Arthroplasty. 2012 Sep;27(8):1538-43. doi: 10.1016/j.arth.2012.01.031. Epub 2012 Mar 14.

Comparison of different distal designs of femoral components and their effects on bone remodeling in 1-stage bilateral total hip arthroplasty.

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  • 1Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Tokyo, Japan.

Abstract

To evaluate the effects of distal design of a proximally coated femoral component on periprosthetic bone remodeling, we prospectively performed 21 one-stage bilateral total hip arthroplasties using a distally tapered and a distally cylindrical stem with the same proximal design, randomized to side. All hips showed good outcomes clinically and radiographically at the final follow-up, average of 7 years postoperatively. Cancellous condensation was always found in Gruen's zones 2 and 6 around the cylindrical stem and in regions between zones 2 and 3 and between zones 6 and 5 around the tapered stem. Bone mineral density of Gruen's zones 2 and 6 was significantly lower around the tapered stem. These results suggested more distal loading in hips with the tapered stem than in those with the cylindrical stem.

Copyright © 2012 Elsevier Inc. All rights reserved.

PMID:
22425307
[PubMed - indexed for MEDLINE]
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