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Migration pattern of a short uncemented stem with or without collar : a randomised RSA-study with 2 years follow-up

Weber, Erik LU ; Flivik, Carl ; Sundberg, Martin LU and Flivik, Gunnar LU (2019) In HIP International
Abstract

Background: There is an increasing interest in shorter, proximally loading, uncemented femoral stems. The aim of this study was to evaluate a new short stem type, its design based on a well-proven precursor, but with several new design features to facilitate easier insertion and possible preservation of proximal bone stock. It is available with or without a collar. Methods: The study includes 50 patients with primary osteoarthritis, mean age 59 (range 36–75) years, randomised to receive either the collar-fitted or the collarless stem. The patients underwent repeated radiostereometry (RSA) examinations (0, 0.5, 3, 12, 24 months), conventional radiography and filled out both hip-specific (HOOS) and general health (EQ-5D) questionnaires.... (More)

Background: There is an increasing interest in shorter, proximally loading, uncemented femoral stems. The aim of this study was to evaluate a new short stem type, its design based on a well-proven precursor, but with several new design features to facilitate easier insertion and possible preservation of proximal bone stock. It is available with or without a collar. Methods: The study includes 50 patients with primary osteoarthritis, mean age 59 (range 36–75) years, randomised to receive either the collar-fitted or the collarless stem. The patients underwent repeated radiostereometry (RSA) examinations (0, 0.5, 3, 12, 24 months), conventional radiography and filled out both hip-specific (HOOS) and general health (EQ-5D) questionnaires. Results: There was no statistically significant difference between the collared and collarless stems regarding migration and clinical outcome. Both stem types exhibit a similar pattern of initial subsidence (collared 0.63 mm vs. collarless 0.75 mm [p = 0.50]) and retroversion (collared 0.71° vs. collarless 0.97° [p = 0.36]) up to 3 months followed by stabilisation, in similarity with its precursors, suggesting good osseointegration. No stem has been revised or considered loose. Conclusions: The new design features, including shortening the stem, do not compromise migration pattern or osseointegration, regardless collar or not.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Furlong, hip stem, postoperative migration, RSA, THA, uncemented
in
HIP International
publisher
Wichtig Editore
external identifiers
  • scopus:85077152145
  • pmid:31793347
ISSN
1120-7000
DOI
10.1177/1120700019888471
language
English
LU publication?
yes
id
7ea9dcf4-00c1-48ad-985d-1bb4757d5838
date added to LUP
2020-01-14 14:35:19
date last changed
2020-01-16 04:09:31
@article{7ea9dcf4-00c1-48ad-985d-1bb4757d5838,
  abstract     = {<p>Background: There is an increasing interest in shorter, proximally loading, uncemented femoral stems. The aim of this study was to evaluate a new short stem type, its design based on a well-proven precursor, but with several new design features to facilitate easier insertion and possible preservation of proximal bone stock. It is available with or without a collar. Methods: The study includes 50 patients with primary osteoarthritis, mean age 59 (range 36–75) years, randomised to receive either the collar-fitted or the collarless stem. The patients underwent repeated radiostereometry (RSA) examinations (0, 0.5, 3, 12, 24 months), conventional radiography and filled out both hip-specific (HOOS) and general health (EQ-5D) questionnaires. Results: There was no statistically significant difference between the collared and collarless stems regarding migration and clinical outcome. Both stem types exhibit a similar pattern of initial subsidence (collared 0.63 mm vs. collarless 0.75 mm [p = 0.50]) and retroversion (collared 0.71° vs. collarless 0.97° [p = 0.36]) up to 3 months followed by stabilisation, in similarity with its precursors, suggesting good osseointegration. No stem has been revised or considered loose. Conclusions: The new design features, including shortening the stem, do not compromise migration pattern or osseointegration, regardless collar or not.</p>},
  author       = {Weber, Erik and Flivik, Carl and Sundberg, Martin and Flivik, Gunnar},
  issn         = {1120-7000},
  language     = {eng},
  month        = {12},
  publisher    = {Wichtig Editore},
  series       = {HIP International},
  title        = {Migration pattern of a short uncemented stem with or without collar : a randomised RSA-study with 2 years follow-up},
  url          = {http://dx.doi.org/10.1177/1120700019888471},
  doi          = {10.1177/1120700019888471},
  year         = {2019},
}