JaLCDOI 10.18926/AMO/53523
FullText URL 69_3_165.pdf
Author Sarai, Takaaki| Tokumoto, Akihiro|
Abstract Fall accidents are a common cause of femoral fracture in the elderly. The greater trochanter of the femur is often subjected to impact loading by a sideways fall, and thus it is worth studying the impulsive stress waves propagating in the femur. In this study, the impulsive stress was analyzed by the dynamic finite element method using a 3-dimensional model of the femur, and the influence of the fall configuration on the stress was discussed. The stress was concentrated around the femoral neck during the propagation of the stress wave, and the tensile maximum principal stress changed into compressive minimum principle stress on the anterior and medial sides of the neck. On the other hand, the compressive minimum principal stress changed into tensile maximum principle stress on the lateral side of the neck. The largest maximum principal stress during the impact loading was always larger in the neck than in the impact region. The largest absolute value of the minimum principal stress was found in the neck or the impact region depending on the fall configuration. The largest absolute values of the maximum and minimum principal stress were nearly equal, indicating that the bone fracture due to the tensile stress may occur around the femoral neck.
Keywords biomechanics sideways fall femoral neck greater trochanter impulsive stress wave
Amo Type Original Article
Published Date 2015-06
Publication Title Acta Medica Okayama
Volume volume69
Issue issue3
Publisher Okayama University Medical School
Start Page 165
End Page 171
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language 英語
Copyright Holders CopyrightⒸ 2015 by Okayama University Medical School
File Version publisher
Refereed True
PubMed ID 26101192
Web of Science KeyUT 000356903000005
Author Tanaka, Yutaka| Tsukaoka, Hideki| Takeda, Hidetoshi| Honda, Kazuo| Sarai, Takaaki|
Published Date 1991-11
Publication Title Intelligent Robots and Systems '91. 'Intelligence for Mechanical Systems
Volume volume1
Content Type Journal Article
JaLCDOI 10.18926/15681
FullText URL Mem_Sch_Eng_OU_10_2_1.pdf
Author Honda Kazuo| Hosokawa Norio| Sarai Takaaki|
Abstract The diffracted intensity of X-ray depends upon several physical and geometrical factors such as structure, multiplicity, absorption and Lorentzpolarization and measuring conditions such as time constant and scanning speed of detector on counter method[l]. For analyzing on the X-ray stress measurement, especially, profile shape of X-ray diffraction which is affected by geometrical factors such as absorption and Lorentz-polarization is very important. In order to eliminate these factors affecting the stress measured by using X-ray, the correcting factors were introduced and those theoretical values were calculated. After this theoretical calculation, it is found that as the half value breadth increases the difference between the stress measured by using X-ray and the corrected one becomes larger and larger under same measuring condition. When the ideal diffracted intensity of X-ray is assumed Cauchy distribution the measured stress depends upon measuring condition for same specimen, but it is independent of measuring condition in Gauss, distribution. Consequently, it is found that the stress measured by using X-ray must be corrected under each measuring condition and the method of correction is made clear and proved experimentally in this paper.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1976-01-27
Volume volume10
Issue issue2
Start Page 1
End Page 13
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307339