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Mechanical simulation study of postoperative displacement of trochanteric fractures using the finite element method
BACKGROUND: Femoral trochanteric fractures are common among older adults. In the reduction of trochanteric fractures, acquiring the support of the anterior cortex at the fracture site on lateral view immediately after surgery is important. However, even if the cortical support is acquired, postopera...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6258410/ https://www.ncbi.nlm.nih.gov/pubmed/30482230 http://dx.doi.org/10.1186/s13018-018-1011-y |
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author | Furui, Atsuo Terada, Nobuki Mito, Kazuaki |
author_facet | Furui, Atsuo Terada, Nobuki Mito, Kazuaki |
author_sort | Furui, Atsuo |
collection | PubMed |
description | BACKGROUND: Femoral trochanteric fractures are common among older adults. In the reduction of trochanteric fractures, acquiring the support of the anterior cortex at the fracture site on lateral view immediately after surgery is important. However, even if the cortical support is acquired, postoperative displacement due to the loss of this support often occurs. This study aimed to investigate local stress distribution in several trochanteric fracture models and to evaluate risk factors for postoperative displacement using the finite element (FE) method. METHODS: Displaced two-fragment fracture models with an angulation deformity at the fracture site and a non-displaced two-fragment fracture model were constructed. The models with an angulation deformity were of two types, one with the proximal fragment directed backward (type A) and the other with the proximal fragment rotated forward from the femoral neck axis (type B). Thereafter, FE models of the femur and a sliding hip screw mounted on a 135° three-hole side-plate were constructed. A 2010-N load was applied to the femoral head, and a 1086-N load was applied to the greater trochanter. Under this condition, the maximum value of the von Mises stress distribution and the amount of displacement of the femoral head vertex in the distal direction were investigated. RESULTS: A larger maximum stress value at the medial femoral neck cortex and a higher amount of displacement in the distal direction were particularly recognized in type A models. These results indicate that microstructural damage was larger in type A models and that type A fracture alignment may be particularly related to fracture collapse and subsequent postoperative displacement. CONCLUSION: Even if support of the anterior cortex at the fracture site on lateral view is acquired immediately after surgery, caution is necessary for cases in which the proximal fragment is directed backward in the postoperative displacement from the viewpoint of the biomechanics of the FE method. |
format | Online Article Text |
id | pubmed-6258410 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-62584102018-11-29 Mechanical simulation study of postoperative displacement of trochanteric fractures using the finite element method Furui, Atsuo Terada, Nobuki Mito, Kazuaki J Orthop Surg Res Research Article BACKGROUND: Femoral trochanteric fractures are common among older adults. In the reduction of trochanteric fractures, acquiring the support of the anterior cortex at the fracture site on lateral view immediately after surgery is important. However, even if the cortical support is acquired, postoperative displacement due to the loss of this support often occurs. This study aimed to investigate local stress distribution in several trochanteric fracture models and to evaluate risk factors for postoperative displacement using the finite element (FE) method. METHODS: Displaced two-fragment fracture models with an angulation deformity at the fracture site and a non-displaced two-fragment fracture model were constructed. The models with an angulation deformity were of two types, one with the proximal fragment directed backward (type A) and the other with the proximal fragment rotated forward from the femoral neck axis (type B). Thereafter, FE models of the femur and a sliding hip screw mounted on a 135° three-hole side-plate were constructed. A 2010-N load was applied to the femoral head, and a 1086-N load was applied to the greater trochanter. Under this condition, the maximum value of the von Mises stress distribution and the amount of displacement of the femoral head vertex in the distal direction were investigated. RESULTS: A larger maximum stress value at the medial femoral neck cortex and a higher amount of displacement in the distal direction were particularly recognized in type A models. These results indicate that microstructural damage was larger in type A models and that type A fracture alignment may be particularly related to fracture collapse and subsequent postoperative displacement. CONCLUSION: Even if support of the anterior cortex at the fracture site on lateral view is acquired immediately after surgery, caution is necessary for cases in which the proximal fragment is directed backward in the postoperative displacement from the viewpoint of the biomechanics of the FE method. BioMed Central 2018-11-27 /pmc/articles/PMC6258410/ /pubmed/30482230 http://dx.doi.org/10.1186/s13018-018-1011-y Text en © The Author(s). 2018 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. |
spellingShingle | Research Article Furui, Atsuo Terada, Nobuki Mito, Kazuaki Mechanical simulation study of postoperative displacement of trochanteric fractures using the finite element method |
title | Mechanical simulation study of postoperative displacement of trochanteric fractures using the finite element method |
title_full | Mechanical simulation study of postoperative displacement of trochanteric fractures using the finite element method |
title_fullStr | Mechanical simulation study of postoperative displacement of trochanteric fractures using the finite element method |
title_full_unstemmed | Mechanical simulation study of postoperative displacement of trochanteric fractures using the finite element method |
title_short | Mechanical simulation study of postoperative displacement of trochanteric fractures using the finite element method |
title_sort | mechanical simulation study of postoperative displacement of trochanteric fractures using the finite element method |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6258410/ https://www.ncbi.nlm.nih.gov/pubmed/30482230 http://dx.doi.org/10.1186/s13018-018-1011-y |
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