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

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Bibtex

@article{c2c9ff6b7a9248a1988f322e2faa5473,
title = "Design modifications of the uncemented Furlong hip stem result in minor early subsidence but do not affect further stability.",
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 = "Erik Weber and Martin Sundberg and Gunnar Flivik",
year = "2014",
doi = "10.3109/17453674.2014.958810",
language = "English",
volume = "85",
pages = "556--561",
journal = "Acta Orthopaedica",
issn = "1745-3682",
publisher = "Taylor & Francis",
number = "6",

}