Bore Disruption: An Unusual Mechanical Failure of Two Hip Hemiarthroplasties

We report a case of two hemiarthroplasties (HAs) that underwent an unexpected mechanical failure. Two patients affected by femoral fractures were treated with an HA. At 5 and 7 years after surgery, they showed a breakage of the HA at the head–stem junction. We analyzed macroscopically and microscopi...

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Autores principales: Dettoni, Federico, Cottino, Umberto, Spriano, Silvia, Bonasia, Davide Edoardo, Rossi, Roberto
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Georg Thieme Verlag KG 2017
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5672855/
https://www.ncbi.nlm.nih.gov/pubmed/29114631
http://dx.doi.org/10.1055/s-0037-1601407
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author Dettoni, Federico
Cottino, Umberto
Spriano, Silvia
Bonasia, Davide Edoardo
Rossi, Roberto
author_facet Dettoni, Federico
Cottino, Umberto
Spriano, Silvia
Bonasia, Davide Edoardo
Rossi, Roberto
author_sort Dettoni, Federico
collection PubMed
description We report a case of two hemiarthroplasties (HAs) that underwent an unexpected mechanical failure. Two patients affected by femoral fractures were treated with an HA. At 5 and 7 years after surgery, they showed a breakage of the HA at the head–stem junction. We analyzed macroscopically and microscopically (by a scanning electron microscopy) the surfaces of the broken prostheses. In both cases, a fracture was detected starting at the joining point between the femoral head and the slot that receives the taper cone of the stem (the so-called bore), with the typical macroscopic and microscopic pattern of a fatigue fracture. The fatigue fracture resulted from repeated cycles of torsional stresses throughout the years. In literature, we did not find any other report of such HA failure.
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spelling pubmed-56728552017-11-07 Bore Disruption: An Unusual Mechanical Failure of Two Hip Hemiarthroplasties Dettoni, Federico Cottino, Umberto Spriano, Silvia Bonasia, Davide Edoardo Rossi, Roberto Joints We report a case of two hemiarthroplasties (HAs) that underwent an unexpected mechanical failure. Two patients affected by femoral fractures were treated with an HA. At 5 and 7 years after surgery, they showed a breakage of the HA at the head–stem junction. We analyzed macroscopically and microscopically (by a scanning electron microscopy) the surfaces of the broken prostheses. In both cases, a fracture was detected starting at the joining point between the femoral head and the slot that receives the taper cone of the stem (the so-called bore), with the typical macroscopic and microscopic pattern of a fatigue fracture. The fatigue fracture resulted from repeated cycles of torsional stresses throughout the years. In literature, we did not find any other report of such HA failure. Georg Thieme Verlag KG 2017-06-05 /pmc/articles/PMC5672855/ /pubmed/29114631 http://dx.doi.org/10.1055/s-0037-1601407 Text en https://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License, which permits unrestricted reproduction and distribution, for non-commercial purposes only; and use and reproduction, but not distribution, of adapted material for non-commercial purposes only, provided the original work is properly cited.
spellingShingle Dettoni, Federico
Cottino, Umberto
Spriano, Silvia
Bonasia, Davide Edoardo
Rossi, Roberto
Bore Disruption: An Unusual Mechanical Failure of Two Hip Hemiarthroplasties
title Bore Disruption: An Unusual Mechanical Failure of Two Hip Hemiarthroplasties
title_full Bore Disruption: An Unusual Mechanical Failure of Two Hip Hemiarthroplasties
title_fullStr Bore Disruption: An Unusual Mechanical Failure of Two Hip Hemiarthroplasties
title_full_unstemmed Bore Disruption: An Unusual Mechanical Failure of Two Hip Hemiarthroplasties
title_short Bore Disruption: An Unusual Mechanical Failure of Two Hip Hemiarthroplasties
title_sort bore disruption: an unusual mechanical failure of two hip hemiarthroplasties
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5672855/
https://www.ncbi.nlm.nih.gov/pubmed/29114631
http://dx.doi.org/10.1055/s-0037-1601407
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