Biomechanical evaluations of hip fracture mechanism in pedestrian fall accident

Sota Yamamoto, Eiichi Tanaka, Yasuharu Kubouchi, Takeshi Ikeda, Koji Mizuno, Atsushi Harada, Hiroyasu Okuizumi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Hip fracture is one of the most important topics in geriatric medicine because the number of this injury is increasing rapidly with the population of the elderly people. To clarify the mechanism of hip fracture and investigate the method of fracture prevention, we developed a fall simulation system which considers the boundary conditions at real fall accidents. Firstly, we constructed a pedestrian multibody model and compared the results of the fall simulations by the model with those of the volunteer fall experiment in a literature. The simulation results showed a distribution of fall direction similar to that of the experimental data. Next we developed a hybrid type simulation model which consists of a detailed finite element model of thigh and hip joint, and multibody model of the other parts of a whole human body. Using the hybrid model we conducted stress analyses of femur neck. The results showed that knee grounding fall caused hip fracture risk higher than the risk by a lateral impact on the greater trochanter. By comparing the regions of stress concentration, we estimated that a knee grounding causes a cervical fracture while a trochanter grounding may cause a trochanteric fracture.

Original languageEnglish
Pages (from-to)1799-1807
Number of pages9
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume72
Issue number11
Publication statusPublished - 2006 Nov
Externally publishedYes

Fingerprint

Accidents
Electric grounding
Geriatrics
Medicine
Stress concentration
Boundary conditions
Experiments

Keywords

  • Biomechanics
  • Fall
  • Finite element analysis
  • Hip fracture
  • Multibody analysis

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Biomechanical evaluations of hip fracture mechanism in pedestrian fall accident. / Yamamoto, Sota; Tanaka, Eiichi; Kubouchi, Yasuharu; Ikeda, Takeshi; Mizuno, Koji; Harada, Atsushi; Okuizumi, Hiroyasu.

In: Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A, Vol. 72, No. 11, 11.2006, p. 1799-1807.

Research output: Contribution to journalArticle

Yamamoto, Sota ; Tanaka, Eiichi ; Kubouchi, Yasuharu ; Ikeda, Takeshi ; Mizuno, Koji ; Harada, Atsushi ; Okuizumi, Hiroyasu. / Biomechanical evaluations of hip fracture mechanism in pedestrian fall accident. In: Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A. 2006 ; Vol. 72, No. 11. pp. 1799-1807.
@article{2b90df88895643b88ab3fd02e95ff200,
title = "Biomechanical evaluations of hip fracture mechanism in pedestrian fall accident",
abstract = "Hip fracture is one of the most important topics in geriatric medicine because the number of this injury is increasing rapidly with the population of the elderly people. To clarify the mechanism of hip fracture and investigate the method of fracture prevention, we developed a fall simulation system which considers the boundary conditions at real fall accidents. Firstly, we constructed a pedestrian multibody model and compared the results of the fall simulations by the model with those of the volunteer fall experiment in a literature. The simulation results showed a distribution of fall direction similar to that of the experimental data. Next we developed a hybrid type simulation model which consists of a detailed finite element model of thigh and hip joint, and multibody model of the other parts of a whole human body. Using the hybrid model we conducted stress analyses of femur neck. The results showed that knee grounding fall caused hip fracture risk higher than the risk by a lateral impact on the greater trochanter. By comparing the regions of stress concentration, we estimated that a knee grounding causes a cervical fracture while a trochanter grounding may cause a trochanteric fracture.",
keywords = "Biomechanics, Fall, Finite element analysis, Hip fracture, Multibody analysis",
author = "Sota Yamamoto and Eiichi Tanaka and Yasuharu Kubouchi and Takeshi Ikeda and Koji Mizuno and Atsushi Harada and Hiroyasu Okuizumi",
year = "2006",
month = "11",
language = "English",
volume = "72",
pages = "1799--1807",
journal = "Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A",
issn = "0387-5008",
publisher = "Japan Society of Mechanical Engineers",
number = "11",

}

TY - JOUR

T1 - Biomechanical evaluations of hip fracture mechanism in pedestrian fall accident

AU - Yamamoto, Sota

AU - Tanaka, Eiichi

AU - Kubouchi, Yasuharu

AU - Ikeda, Takeshi

AU - Mizuno, Koji

AU - Harada, Atsushi

AU - Okuizumi, Hiroyasu

PY - 2006/11

Y1 - 2006/11

N2 - Hip fracture is one of the most important topics in geriatric medicine because the number of this injury is increasing rapidly with the population of the elderly people. To clarify the mechanism of hip fracture and investigate the method of fracture prevention, we developed a fall simulation system which considers the boundary conditions at real fall accidents. Firstly, we constructed a pedestrian multibody model and compared the results of the fall simulations by the model with those of the volunteer fall experiment in a literature. The simulation results showed a distribution of fall direction similar to that of the experimental data. Next we developed a hybrid type simulation model which consists of a detailed finite element model of thigh and hip joint, and multibody model of the other parts of a whole human body. Using the hybrid model we conducted stress analyses of femur neck. The results showed that knee grounding fall caused hip fracture risk higher than the risk by a lateral impact on the greater trochanter. By comparing the regions of stress concentration, we estimated that a knee grounding causes a cervical fracture while a trochanter grounding may cause a trochanteric fracture.

AB - Hip fracture is one of the most important topics in geriatric medicine because the number of this injury is increasing rapidly with the population of the elderly people. To clarify the mechanism of hip fracture and investigate the method of fracture prevention, we developed a fall simulation system which considers the boundary conditions at real fall accidents. Firstly, we constructed a pedestrian multibody model and compared the results of the fall simulations by the model with those of the volunteer fall experiment in a literature. The simulation results showed a distribution of fall direction similar to that of the experimental data. Next we developed a hybrid type simulation model which consists of a detailed finite element model of thigh and hip joint, and multibody model of the other parts of a whole human body. Using the hybrid model we conducted stress analyses of femur neck. The results showed that knee grounding fall caused hip fracture risk higher than the risk by a lateral impact on the greater trochanter. By comparing the regions of stress concentration, we estimated that a knee grounding causes a cervical fracture while a trochanter grounding may cause a trochanteric fracture.

KW - Biomechanics

KW - Fall

KW - Finite element analysis

KW - Hip fracture

KW - Multibody analysis

UR - http://www.scopus.com/inward/record.url?scp=33847142733&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33847142733&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:33847142733

VL - 72

SP - 1799

EP - 1807

JO - Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A

JF - Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A

SN - 0387-5008

IS - 11

ER -