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Movement pattern of the Exeter femoral stem: A radiostereometric analysis of 22 primary hip arthroplasties followed for 5 years

Stefansdottir, Anna LU ; Franzén, Herbert; Johnsson, Ragnar; Ornstein, Ewald LU and Sundberg, Martin LU (2004) In Acta Orthopaedica Scandinavica 75(4). p.408-414
Abstract
Background The design of the Exeter stem may facilitate distal migration, but radiostereometric analysis (RSA) studies have been limited to 2 years of follow-up.



Patients and methods We followed migration of the Exeter femoral stems in 22 primary hip arthroplasties for 5 years with RSA.



Results All stems migrated distally and the median migration at 2 years was 1.34 mm, while at 5 years it was 1.77 mm. 7 stems migrated above accuracy between 3 and 5 years. (RSA) evaluation of the cement mantle could be performed in 14 cases, and in 5 slight migration was found. Most of the stems rotated towards retroversion and the median rotation at 2 years was 1.2°, while at 5 years it was 1.6°. We found 1 patient... (More)
Background The design of the Exeter stem may facilitate distal migration, but radiostereometric analysis (RSA) studies have been limited to 2 years of follow-up.



Patients and methods We followed migration of the Exeter femoral stems in 22 primary hip arthroplasties for 5 years with RSA.



Results All stems migrated distally and the median migration at 2 years was 1.34 mm, while at 5 years it was 1.77 mm. 7 stems migrated above accuracy between 3 and 5 years. (RSA) evaluation of the cement mantle could be performed in 14 cases, and in 5 slight migration was found. Most of the stems rotated towards retroversion and the median rotation at 2 years was 1.2°, while at 5 years it was 1.6°. We found 1 patient with impending clinical failure but no deviation in the RSA migration pattern, and 1 patient with unstable migration pattern but no clinical symptoms.



Interpretation We found a greater distal migration of the Exeter stem for longer periods of time than seen with other types of cemented implants. (Less)
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Contribution to journal
publication status
published
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in
Acta Orthopaedica Scandinavica
volume
75
issue
4
pages
408 - 414
publisher
Taylor & Francis
external identifiers
  • wos:000223745500006
  • pmid:15370583
  • scopus:4444287140
ISSN
0001-6470
DOI
10.1080/00016470410001169
language
English
LU publication?
yes
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1bbdb4c2-f746-470a-92de-084d3ef32db7 (old id 127126)
alternative location
http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=Retrieve&db=PubMed&list_uids=15370583&dopt=Abstract
date added to LUP
2007-07-04 09:31:53
date last changed
2017-11-27 12:52:53
@article{1bbdb4c2-f746-470a-92de-084d3ef32db7,
  abstract     = {Background The design of the Exeter stem may facilitate distal migration, but radiostereometric analysis (RSA) studies have been limited to 2 years of follow-up.<br/><br>
<br/><br>
Patients and methods We followed migration of the Exeter femoral stems in 22 primary hip arthroplasties for 5 years with RSA.<br/><br>
<br/><br>
Results All stems migrated distally and the median migration at 2 years was 1.34 mm, while at 5 years it was 1.77 mm. 7 stems migrated above accuracy between 3 and 5 years. (RSA) evaluation of the cement mantle could be performed in 14 cases, and in 5 slight migration was found. Most of the stems rotated towards retroversion and the median rotation at 2 years was 1.2°, while at 5 years it was 1.6°. We found 1 patient with impending clinical failure but no deviation in the RSA migration pattern, and 1 patient with unstable migration pattern but no clinical symptoms.<br/><br>
<br/><br>
Interpretation We found a greater distal migration of the Exeter stem for longer periods of time than seen with other types of cemented implants.},
  author       = {Stefansdottir, Anna and Franzén, Herbert and Johnsson, Ragnar and Ornstein, Ewald and Sundberg, Martin},
  issn         = {0001-6470},
  language     = {eng},
  number       = {4},
  pages        = {408--414},
  publisher    = {Taylor & Francis},
  series       = {Acta Orthopaedica Scandinavica},
  title        = {Movement pattern of the Exeter femoral stem: A radiostereometric analysis of 22 primary hip arthroplasties followed for 5 years},
  url          = {http://dx.doi.org/10.1080/00016470410001169},
  volume       = {75},
  year         = {2004},
}