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Design modifications of the uncemented Furlong hip stem result in minor early subsidence but do not affect further stability.

Weber, Erik LU ; Sundberg, Martin LU and Flivik, Gunnar LU (2014) In Acta Orthopaedica 85(6). p.556-561
Abstract
Background and purpose - Even small design modifications of uncemented hip stems may alter the postoperative 3-D migration pattern. The Furlong Active is an uncemented femoral stem which, in terms of design, is based on its precursor-the well-proven Furlong HAC-but has undergone several design changes. The collar has been removed on the Active stem along with the lateral fin; it is shorter and has more rounded edges in the proximal part. We compared the migration patterns of the uncemented Furlong HAC stem and the modified Furlong Active stem in a randomized, controlled trial over 5 years using radiostereometry (RSA). Patients and methods - 50 patients with primary osteoarthritis were randomized to receive either the HAC stem or the Active... (More)
Background and purpose - Even small design modifications of uncemented hip stems may alter the postoperative 3-D migration pattern. The Furlong Active is an uncemented femoral stem which, in terms of design, is based on its precursor-the well-proven Furlong HAC-but has undergone several design changes. The collar has been removed on the Active stem along with the lateral fin; it is shorter and has more rounded edges in the proximal part. We compared the migration patterns of the uncemented Furlong HAC stem and the modified Furlong Active stem in a randomized, controlled trial over 5 years using radiostereometry (RSA). Patients and methods - 50 patients with primary osteoarthritis were randomized to receive either the HAC stem or the Active stem. The patients underwent repeated RSA examinations (postoperatively, at 3 months, and after 1, 2, and 5 years) and conventional radiography, and they also filled out hip-specific questionnaires. Results - During the first 3 months, the collarless Active stem subsided to a greater extent than the collar-fitted HAC stem (0.99 mm vs. 0.31 mm, p = 0.05). There were, however, no other differences in movement measured by RSA or in clinical outcome between the 2 stems. After 3 months, both stem types had stabilized and almost no further migration was seen. Interpretation - The Active stem showed no signs of unfavorable migration. Our results suggest that the osseointegration is not compromised by the new design features. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Acta Orthopaedica
volume
85
issue
6
pages
556 - 561
publisher
Taylor & Francis
external identifiers
  • pmid:25175668
  • wos:000345347600003
  • scopus:84911113356
ISSN
1745-3682
DOI
10.3109/17453674.2014.958810
language
English
LU publication?
yes
id
c2c9ff6b-7a92-48a1-988f-322e2faa5473 (old id 4692797)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/25175668?dopt=Abstract
date added to LUP
2014-10-01 11:18:34
date last changed
2017-11-19 03:02:05
@article{c2c9ff6b-7a92-48a1-988f-322e2faa5473,
  abstract     = {Background and purpose - Even small design modifications of uncemented hip stems may alter the postoperative 3-D migration pattern. The Furlong Active is an uncemented femoral stem which, in terms of design, is based on its precursor-the well-proven Furlong HAC-but has undergone several design changes. The collar has been removed on the Active stem along with the lateral fin; it is shorter and has more rounded edges in the proximal part. We compared the migration patterns of the uncemented Furlong HAC stem and the modified Furlong Active stem in a randomized, controlled trial over 5 years using radiostereometry (RSA). Patients and methods - 50 patients with primary osteoarthritis were randomized to receive either the HAC stem or the Active stem. The patients underwent repeated RSA examinations (postoperatively, at 3 months, and after 1, 2, and 5 years) and conventional radiography, and they also filled out hip-specific questionnaires. Results - During the first 3 months, the collarless Active stem subsided to a greater extent than the collar-fitted HAC stem (0.99 mm vs. 0.31 mm, p = 0.05). There were, however, no other differences in movement measured by RSA or in clinical outcome between the 2 stems. After 3 months, both stem types had stabilized and almost no further migration was seen. Interpretation - The Active stem showed no signs of unfavorable migration. Our results suggest that the osseointegration is not compromised by the new design features.},
  author       = {Weber, Erik and Sundberg, Martin and Flivik, Gunnar},
  issn         = {1745-3682},
  language     = {eng},
  number       = {6},
  pages        = {556--561},
  publisher    = {Taylor & Francis},
  series       = {Acta Orthopaedica},
  title        = {Design modifications of the uncemented Furlong hip stem result in minor early subsidence but do not affect further stability.},
  url          = {http://dx.doi.org/10.3109/17453674.2014.958810},
  volume       = {85},
  year         = {2014},
}