Dynamic response of human foot and ankle system to vertical vibration

2011 ◽  
Author(s):  
Hwabok Wee ◽  
Arkady Voloshin
Keyword(s):  
Dynamic Response ◽  
Vertical Vibration ◽  
Foot And Ankle ◽  
Human Foot

Transmission of Vertical Vibration to the Human Foot and Ankle

2013 ◽  
Vol 41 (6) ◽  
pp. 1172-1180 ◽  
Author(s):  
Hwabok Wee ◽  
Arkady Voloshin
Keyword(s):  
Vertical Vibration ◽  
Foot And Ankle ◽  
Human Foot

Common Foot and Ankle Disorders in Adults and Children

2015 ◽  
Vol 19 (2) ◽  
pp. 54-65 ◽  
Author(s):  
Ganesan Balasankar ◽  
Luximon Ameersing
Keyword(s):  
Soft Tissues ◽  
Adult Population ◽  
Complex Structure ◽  
Whole Body ◽  
Clinical Aspects ◽  
Foot Deformities ◽  
Foot And Ankle ◽  
Human Foot ◽  
Flat Feet ◽  
Adults And Children

The human foot is a complex structure, which includes bones, joints, muscles, ligaments, soft tissues, nerves and veins. It supports the weight of the whole body and helps one to walk, run, and jump. Ankle and foot biomechanical functions that are interrupted by various pathological deformities lead to pain or other deformities, and result in difficulties during mobility. Foot problems are very common in children and adults. In this article, attempts are made to explore the clinical aspects of the most common foot and ankle deformities and their management by children and adults. Foot deformities may be congenital or acquired, and may involve arthritis conditions, such as rheumatoid arthritis and osteoarthritis. In children, congenital clubfoot, cavus, and flat feet are the most common disorders and can be treated by non-operative means or surgical management. Hallux valgus and rigidus, lesser toe deformities, and arthritis are mostly present with or without pain in the adult population.

Influence Analysis of Cell Plate Length to Slab Track Vertical Dynamic Response

2014 ◽  
Vol 505-506 ◽  
pp. 58-63
Author(s):  
Xiao Chuan Ma ◽  
Wei Luo ◽  
Ping Wang ◽  
Bao Ru Guo
Keyword(s):  
Dynamic Response ◽  
Base Plate ◽  
Shell Element ◽  
Cell Plate ◽  
Vertical Vibration ◽  
Vibration Acceleration ◽  
Vibration Displacement ◽  
Coupling Vibration ◽  
Slab Track ◽  
Plate Length

A vehicle-track-subgrade coupling vibration system model was proposed to analysis the influence of cell plate length to slab track vertical dynamic response. The model was built with finite element method, rail was modeled as space beam element, both track plate and base plate were modeled as shell element, the vertical connections between rail, slab and subgrade were modeled as spring-damper element. The results show that with the cell plate length increases, the vertical vibration displacement of rail, track plate and base plate have decreasing tendency; the vertical vibration acceleration of rail has increasing tendency; the vertical vibration acceleration of track plate and base plate have decreasing tendency.

scholarly journals Soil-Pile Interaction in the Pile Vertical Vibration Based on Fictitious Soil-Pile Model

2014 ◽  
Vol 2014 ◽  
pp. 1-11
Author(s):  
Guodong Deng ◽  
Jiasheng Zhang ◽  
Wenbing Wu ◽  
Xiong Shi ◽  
Fei Meng
Keyword(s):  
Dynamic Response ◽  
Separation Of Variables ◽  
Vertical Vibration ◽  
Dynamic Responses ◽  
Dynamic Force ◽  
Laplace Transform Technique ◽  
Velocity Response ◽  
Pile Interaction ◽  
Pile Model ◽  
Fictitious Soil

By introducing the fictitious soil-pile model, the soil-pile interaction in the pile vertical vibration is investigated. Firstly, assuming the surrounding soil of pile to be viscoelastic material and considering its vertical wave effect, the governing equations of soil-pile system subjected to arbitrary harmonic dynamic force are founded based on the Euler-Bernoulli rod theory. Secondly, the analytical solution of velocity response in frequency domain and its corresponding semianalytical solution of velocity response in time domain are derived by means of Laplace transform technique and separation of variables technique. Based on the obtained solutions, the influence of parameters of pile end soil on the dynamic response is studied in detail for different designing parameters of pile. Lastly, the fictitious soil-pile model and other pile end soil supporting models are compared. It is shown that the dynamic response obtained by the fictitious soil-pile model is among the dynamic responses obtained by other existing models if there are appropriate material parameters and thickness of pile end soil for the fictitious soil-pile model.

scholarly journals The energetic function of the human foot and its muscles during accelerations and decelerations

2021 ◽  
Author(s):  
Ross E. Smith ◽  
Glen A. Lichtwark ◽  
Luke A. Kelly
Keyword(s):  
Steady State ◽  
Nerve Block ◽  
Center Of Mass ◽  
Work Capacity ◽  
Work Demands ◽  
Foot And Ankle ◽  
Human Foot ◽  
Before And After ◽  
Ankle Function ◽  
Intrinsic Muscles

The human foot is known to aid propulsion by storing and returning elastic energy during steady-state locomotion. While its function during other tasks is less clear, recent evidence suggests the foot and its intrinsic muscles can also generate or dissipate energy based on the energetic requirements of the center of mass during non-steady state locomotion. In order to examine contributions of the foot and its muscles to non-steady state locomotion, we compared the energetics of the foot and ankle joint while jumping and landing before and after the application of a tibial nerve block. Under normal conditions, energetic contributions of the foot rose as work demands increased, while the relative contributions of the foot to center of mass work remained constant with increasing work demands. Under the nerve block, foot contributions to both jumping and landing decreased. Additionally, ankle contributions were also decreased under the influence of the block for both tasks. Our results reinforce findings that foot and ankle function mirror the energetic requirements of the center of mass and provide novel evidence that foot contributions remain relatively constant under increasing energetic demands. Also, while the intrinsic muscles can modulate the energetic capacity of the foot, their removal accounted for only a three-percent decrement in total center of mass work. Therefore, the small size of intrinsic muscles appears to limit their capacity to contribute to center of mass work. However, their role in contributing to ankle work capacity is likely important for the energetics of movement.

Radiography of Soft Tissue of the Foot and Ankle with Diffraction Enhanced Imaging

2004 ◽  
Vol 94 (3) ◽  
pp. 315-322 ◽  
Author(s):  
Jun Li ◽  
Zhong Zhong ◽  
Roy Lidtke ◽  
Klaus E. Kuettner ◽  
Charles Peterfy ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Soft Tissues ◽  
Foot And Ankle ◽  
Contrast Imaging ◽  
X Ray ◽  
Human Foot ◽  
Diffraction Enhanced Imaging ◽  
High Contrast Imaging ◽  
X Ray Imaging ◽  
Calcified Tissues

Non-calcified tissues, including tendons, ligaments, adipose tissue and cartilage, are not visible, for any practical purposes, with conventional X-ray imaging. Therefore, any pathological changes in these tissues generally necessitate detection through magnetic resonance imaging or ultrasound technology. Until recently the development of an X-ray imaging technique that could detect both bone and soft tissues seemed unrealistic. However, the introduction of diffraction enhanced X-ray imaging (DEI) which is capable of rendering images with absorption, refraction and scatter rejection qualities has allowed detection of specific soft tissues based on small differences in tissue densities. Here we show for the first time that DEI allows high contrast imaging of soft tissues, including ligaments, tendons and adipose tissue, of the human foot and ankle. (J Am Podiatr Med Assoc 94(3): 315–322, 2004)

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