Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Furui, Atsuo, Terada, Nobuki, Mito, Kazuaki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2018
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
_version_ 1783374485414477824
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
work_keys_str_mv AT furuiatsuo mechanicalsimulationstudyofpostoperativedisplacementoftrochantericfracturesusingthefiniteelementmethod
AT teradanobuki mechanicalsimulationstudyofpostoperativedisplacementoftrochantericfracturesusingthefiniteelementmethod
AT mitokazuaki mechanicalsimulationstudyofpostoperativedisplacementoftrochantericfracturesusingthefiniteelementmethod