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Fatigue Fracture in Dual Modular Revision Total Hip Arthroplasty Stems: Failure Analysis and Computed Tomography Diagnostics in Two Cases.

Norman, Pontus; Iyengar, Srinivasan; Svensson, Ingrid and Flivik, Gunnar LU (2014) In Journal of Arthroplasty 29(4). p.850-855
Abstract
We report on two patients with fracture of a modular, tapered and distally fixed, uncemented titanium revision hip stem, not previously described. A failure analysis revealed that the cause of the fractures was the development of fatigue cracks in the mid-stem cobalt-chromium modular junction ending in corrosion-fatigue failure. No material defects or stress risers were found in any of the implants. The diameter of the mid-stem modular junction might be undersized for use in heavy and active patients. We also report a new way of detecting an undisplaced fracture at the modular junction, using the scout image from a computed tomography (CT) scan; a technique that can be used when plain radiographs are inconclusive.
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Arthroplasty
volume
29
issue
4
pages
850 - 855
publisher
Elsevier
external identifiers
  • pmid:24120507
  • wos:000334094000044
  • scopus:84896542111
ISSN
0883-5403
DOI
10.1016/j.arth.2013.09.008
language
English
LU publication?
yes
id
eec166ac-2336-4371-b6f6-38bf6fb4e0f3 (old id 4143331)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/24120507?dopt=Abstract
date added to LUP
2013-11-05 17:23:01
date last changed
2017-10-22 03:25:44
@article{eec166ac-2336-4371-b6f6-38bf6fb4e0f3,
  abstract     = {We report on two patients with fracture of a modular, tapered and distally fixed, uncemented titanium revision hip stem, not previously described. A failure analysis revealed that the cause of the fractures was the development of fatigue cracks in the mid-stem cobalt-chromium modular junction ending in corrosion-fatigue failure. No material defects or stress risers were found in any of the implants. The diameter of the mid-stem modular junction might be undersized for use in heavy and active patients. We also report a new way of detecting an undisplaced fracture at the modular junction, using the scout image from a computed tomography (CT) scan; a technique that can be used when plain radiographs are inconclusive.},
  author       = {Norman, Pontus and Iyengar, Srinivasan and Svensson, Ingrid and Flivik, Gunnar},
  issn         = {0883-5403},
  language     = {eng},
  number       = {4},
  pages        = {850--855},
  publisher    = {Elsevier},
  series       = {Journal of Arthroplasty},
  title        = {Fatigue Fracture in Dual Modular Revision Total Hip Arthroplasty Stems: Failure Analysis and Computed Tomography Diagnostics in Two Cases.},
  url          = {http://dx.doi.org/10.1016/j.arth.2013.09.008},
  volume       = {29},
  year         = {2014},
}