A Quasi-linear Viscoelastic Model of Foot-ankle Ligaments
نویسندگان
چکیده
Experimental Procedure. Five fresh-frozen lower-limb cadaver specimens were obtained, and the following bone-ligamentbone specimens were prepared: inferior calcaneonavicular (ICN), long plantar (LP), plantar first-cuneiform first-metatarsal (PFCFM), and posterior tibiotalar (PTT). The LP ligament was not harvested beyond its initial insertion into the cuboid. Ligaments were potted in polymethylmethacrylate and tested on an MTS Materials Testing System (MTS Systems Corporation, Eden Prairie, MN). Specimens were preconditioned to maximum passive physiologic strain, defined by measuring ligament displacement from neutral position of cadaver limb to maximum passive eversion, inversion, planterflexion, dorsiflexion, internal rotation and external rotation.
منابع مشابه
Quasi-linear Viscoelasticity of Ankle Ligaments
Prior mechanical testing of ankle ligaments has focused on quantifying ligament ultimate strength (Attarian et al., 1985; Siegler et al., 1988). Few studies have attempted to model the constitutive behavior of ankle ligaments at sub-failure levels. Although the viscoelastic nature of ankle ligaments has been noted (Attarian et al., 1985), no studies have attempted to create a viscoelastic const...
متن کاملEvaluation of a Viscoelastic Ankle-Foot Prosthesis at Slow and Normal Walking Speeds on an Able-Bodied Subject
Objectives: This paper describes further improvement and preliminarily evaluation of a novel viscoelastic ankle-foot prosthesis prototype. The objective was to control the ankle hysteresis at slow and normal walking speeds. Methods: Inspired by the ankle biomechanics, in which the hysteresis differs based on the gait speeds, a manually damping control mechanism imbedded in the prosthesis for...
متن کاملMaterial properties of the heel fat pad across strain rates
The complex structural and material behaviour of the human heel fat pad determines the transmission of plantar loading to the lower limb across a wide range of loading scenarios; from locomotion to injurious incidents. The aim of this study was to quantify the hyper-viscoelastic material properties of the human heel fat pad across strains and strain rates. An inverse finite element (FE) optimis...
متن کاملNonlinear Viscoelastic Behavior of Human Cervical Spine Ligaments
Introduction—Spinal ligaments play an important role in spine biomechanics. Accordingly, a precise understanding of ligament mechanical properties is requisite for accurate modeling of the local and global behavior of the spine. Spinal ligaments exhibit nonlinear stressstrain relationships and viscoelastic material behavior. Current literature on the viscoelastic response of cervical spine liga...
متن کاملA two-part, viscoelastic foot model for use in gait simulations.
A three-dimensional, two-part model of the foot, for use in a simulation of human gait, is presented. Previous simulations of gait have not included the foot segment (e.g. Siegler et al., 1982, J. Biomechanics 15, 415-425) or have fastened it to the ground (e.g. Onyshko and Winter, 1980, J. Biomechanics 13, 361-368). A foot model based on viscoelastic elements (e.g. Meglan, 1991, Ph.D. thesis, ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2001