Analysis of loading to the hip joint in fall using whole-body FE model

Aoshima, Yuhei; Murakami, Sotaro; Mizuno, Koji; Otaka, Yohei; Yamada, Minoru; Jinzaki, Masahiro

doi:10.1016/j.jbiomech.2022.111262

Cited by 5 publications

(1 citation statement)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Importantly, current testing paradigms are limited to isolated benchtop testing 58 , 59 or generic modeling approaches that only use “average” statures. 60 , 61 Soft tissues, exhibiting viscoelastic properties, absorb a greater proportion of force (1 mm of soft tissue can absorb as much as 70 N of force) during lower-speed incidents like falls, a scenario that may not be entirely accurately modeled with tools designed for higher-speed impacts like car crashes. 62 Cadaveric specimens, which are limited to what is available and may not adequately capture the diversity of the living population, do not provide a link between fall mechanics and external loading experienced during fall related injuries making it difficult to accurately assess injury prevention methods.…”

Section: Discussionmentioning

confidence: 99%

Impact forces in backward falls: Subject-specific video-based rigid body simulation of backward falls

Khorami,

Obaid,

Bhatnagar

et al. 2023

Proc Inst Mech Eng H

View full text Add to dashboard Cite

A critical missing component in the study of real-world falls is the ability to accurately determine impact forces resulting from the fall. Subject-specific rigid body dynamic (RBD) models calibrated to video captured falls can quantify impact forces and provide additional insights into injury risk factors. RBD models were developed based on five backward falls captured on surveillance video in long-term care facilities in British Columbia, Canada. Model joint stiffness and initial velocities were calibrated to match the kinematics of the fall and contact forces were calculated. The effect of joint stiffnesses (neck, lumbar spine, hip, and knee joint) on head contact forces were determined by modifying the calibrated stiffness values ±25%. Fall duration, fall trajectories, and maximum velocities showed a close match between fall events and simulations. The maximum value of pelvic velocity difference between Kinovea (an open-source software 2D digitization software) and Madymo multibody modeling was found to be 6% ± 21.58%. Our results demonstrate that neck and hip stiffness values have a non-significant yet large effect on head contact force ( t(3) = 1, p = 0.387 and t(3) = 2, p = 0.138), while lower effects were observed for knee stiffness, and the effect of lumbar spine stiffness was negligible. The subject-specific fall simulations constructed from real world video captured falls allow for direct quantification of force outcomes of falls and may have applications in improving the assessment of fall-induced injury risks and injury prevention methods.

show abstract