Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
Clinical Trial
. 2011 Apr;35(4):483-8.
doi: 10.1007/s00264-009-0913-z. Epub 2009 Dec 13.

Early migration characteristics of a hydroxyapatite-coated femoral stem: an RSA study

David Campbell  1 , Graham Mercer, Kjell G Nilsson, Vanessa Wells, John R Field, Stuart A Callary
Affiliations
Clinical Trial

Early migration characteristics of a hydroxyapatite-coated femoral stem: an RSA study

David Campbell et al. Int Orthop. 2011 Apr.

Abstract

Measurement of early stem subsidence can be used to predict the likelihood of long-term femoral component loosening and clinical failure. Data that examines the early migration pattern of clinically proven stems will provide clinicians with useful baseline data with which to compare new stem designs. This study was performed to evaluate the early migration pattern of a hydroxyapatite-coated press-fit femoral component that has been in use for over ten years. We enrolled 30 patients who underwent THA for osteoarthritis. The median age was 70 years (range, 55-80 years). Patients were clinically assessed using the Harris hip score. Radiostereometric analysis was used to evaluate stem migration at three to four days, six months, one year and two years. We observed a mean subsidence of 0.73 mm at six months, 0.62 mm at one year and 0.58 mm at two years and a mean retroversion of 1.82° at six months, 1.90° at one year and 1.59° at two years. This data suggests that subsidence is confined to the first six months after which there was no further subsidence. The results from this study can be compared with those from novel cementless stem designs to help predict the long-term outcome one may expect from new cementless stem designs.

PubMed Disclaimer

Figures

Fig. 1
Fig. 1
A postoperative radiograph showing the markers inserted into the femur (a) and attached to the stem (b)
Fig. 2
Fig. 2
Mean stem subsidence (mm) after 6, 12 and 24 months. The ranges show the standard error of the mean
Fig. 3
Fig. 3
Graph showing stem subsidence (mm) for individual patients after 6, 12 and 24 months
Fig. 4
Fig. 4
Mean stem rotation (degrees) after 6, 12 and 24 months. The ranges show the standard error of the mean
Fig. 5
Fig. 5
Graph showing stem rotation (degrees) for individual patients after 6, 12 and 24 months
See this image and copyright information in PMC

References

    1. Annual Report. Adelaide: AOA; 2008.
    1. Kurtz S, Ong K, Lau E, Mowat F, Halpern M. Projections of primary and revision hip and knee arthroplasty in the United States from 2005 to 2030. J Bone Joint Surg Am. 2007;89:780–785. doi: 10.2106/JBJS.F.00222. - DOI - PubMed
    1. Mazoochian F, Schrimpf FM, Kircher J, Mayer W, Hauptmann S, Fottner A, Muller PE, Pellengahr C, Jansson V. Proximal loading of the femur leads to low subsidence rates: first clinical results of the CR-stem. Arch Orthop Trauma Surg. 2007;127:397–401. doi: 10.1007/s00402-007-0384-x. - DOI - PubMed
    1. Parvizi J, Keisu KS, Hozack WJ, Sharkey PF, Rothman RH. Primary total hip arthroplasty with an uncemented femoral component: a long-term study of the Taperloc stem. J Arthroplasty. 2004;19:151–156. doi: 10.1016/j.arth.2003.10.003. - DOI - PubMed
    1. Makela KT, Eskelinen A, Pulkkinen P, Paavolainen P, Remes V. Total hip arthroplasty for primary osteoarthritis in patients fifty-five years of age or older. An analysis of the Finnish arthroplasty registry. J Bone Joint Surg Am. 2008;90:2160–2170. doi: 10.2106/JBJS.G.00870. - DOI - PubMed

Publication types

MeSH terms