NDLI: Mechanical failure of a Thompson’s hemiarthoplasty stem 28 years post-implantation: an investigation with electron microscopy

Content Provider	Springer Nature Link
Author	Maris, Ioannis Darmanis, Spyros Kytopoulos, Victor Ecomakis, Angela Kazakos, Konstantis
Copyright Year	2007
Abstract	Τhe authors would like to report a mechanical failure of a Thompson’s prosthesis, 28 years post-implantation. A detailed examination of the specimen revealed no defects in the prosthesis and a dominating ‘brittle component’ fracture of the stem. In this context the detailed fractographic study by scanning electron microscopy (SEM) revealed no detrimental manufactural defects that may have produced microcracks and consequently risked initiating the fracture propagation. In contrast, the fracture was mainly a fatigue one with a mixed mode of microscopic trans- and intergranular crack propagation. To the best of our knowledge, such a mechanism of implant failure in a cementless stem has never before reached 28 years neither in a Thompson’s nor any other type of prosthesis, and in the already reported case, it exceeded 30 years [N. Wolson and J. P. Waadell, Can. J. Surg. 38(6) (1995) 542], however the stem’s ultrastructure has never been investigated under electron microscopy, which arguably can provide a useful assessment of a fatigue fracture. Τhe authors introduce the question of revising our standards when evaluating the newly designed and expensive implants and propose re-focusing on surgical technique, rather than purely on implant properties.
Starting Page	1135
Ending Page	1139
Page Count	5
File Format	PDF
ISSN	09574530
Journal	Journal of Materials Science: Materials in Medicine
Volume Number	18
Issue Number	6
e-ISSN	15734838
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2007-02-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Surfaces and Interfaces, Thin Films Ceramics, Glass, Composites, Natural Methods Metallic Materials Polymer Sciences Characterization and Evaluation of Materials Biomaterials
Content Type	Text
Resource Type	Article
Subject	Biomaterials Biophysics Bioengineering Biomedical Engineering

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