University of Oulu

Shahab Khakpour, Petri Tanska, Simo Saarakkala, Rami K. Korhonen, Timo Jämsä, The effect of body configuration on the strain magnitude and distribution within the acetabulum during sideways falls: A finite element approach, Journal of Biomechanics, Volume 114, 2021, 110156, ISSN 0021-9290,

The effect of body configuration on the strain magnitude and distribution within the acetabulum during sideways falls : a finite element approach

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Author: Khakpour, Shahab1; Tanska, Petri2; Saarakkala, Simo1,3,4;
Organizations: 1Research Unit of Medical Imaging, Physics, and Technology, University of Oulu, Oulu, Finland
2Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
3Medical Research Center, University of Oulu and Oulu University Hospital, Oulu, Finland
4Diagnostic Radiology, Oulu University Hospital, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.1 MB)
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Language: English
Published: Elsevier, 2021
Publish Date: 2021-04-21


While the incidence of hip fractures has declined during the last decades, the incidence of acetabular fractures resulting from low-energy sideways falls has increased, and the mechanisms responsible for this trend remain unknown. Previous studies have suggested that body configuration during the impact plays an important role in a hip fracture. Thus, the aim of this study was to investigate the effect of body configuration angles (trunk tilt angle, trunk flexion angle, femur horizontal rotation angle, and femur diaphysis angle) on low-energy acetabular fractures via a parametric analysis. A computed tomography–based (CT) finite element model of the ground–proximal femur–pelvis complex was created, and strain magnitude, time-history response, and distribution within the acetabulum were evaluated. Results showed that while the trunk tilt angle and femur diaphysis angle have the greatest effect on strain magnitude, the direction of the fall (lateral vs. posterolateral) contributes to strain distribution within the acetabulum. The results also suggest that strain level and distribution within the proximal femur and acetabulum resulting from a sideways fall are not similar and, in some cases, even opposite. Taken together, our simulations suggest that a more horizontal trunk and femoral shaft at the impact phase can increase the risk of low-energy acetabular fractures.

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Series: Journal of biomechanics
ISSN: 0021-9290
ISSN-E: 1873-2380
ISSN-L: 0021-9290
Volume: 114
Article number: 110156
DOI: 10.1016/j.jbiomech.2020.110156
Type of Publication: A1 Journal article – refereed
Field of Science: 3126 Surgery, anesthesiology, intensive care, radiology
Funding: This project was supported by the I4Future doctoral program under the Marie Skłodowska-Curie grant agreement No 713606. CSC – IT Center for Science LTD, Finland, is acknowledged for providing FE software and computational resources.
EU Grant Number: (713606) I4FUTURE - Novel Imaging and Characterisation Methods in Bio, Medical, and Environmental Research and Technology Innovations
Copyright information: © 2020 The Author(s). Published by Elsevier Ltd.This is an open access article under the CC BY-NC-ND license (