A Continuous Loading Apparatus for Measuring Three-dimensional Stiffness of Ankle-Foot Orthoses
作者： Paolo Cappa , Fabrizio Patanè , Giuseppe Di Rosa
DOI: 10.1115/1.2049313
关键词: Structural engineering 、 Rotary stage 、 Rotation 、 Ankle 、 Displacement (orthopedic surgery) 、 Materials science 、 Reaction 、 Load cell 、 Stiffness 、 Orthotics 、 Physiology (medical) 、 Biomedical engineering
摘要: This paper describes a novel device to evaluate the mechanical properties of ankle foot orthoses (AFOs). The apparatus permits the application to AFOs of continuous three-dimensional (3D) movements between specified and settable endpoints. Using an x-y robot with a rotary stage and a six-component load cell, characteristic displacement versus reaction force curves can be generated and consequently the ankle moments can be determined as a function of dorsi/plantar flexion, inv/eversion and int/external rotation. Representative curves for two polypropylene lateral leaf AFOs, different in shape but produced for the same leg by a skilled orthotist, are presented to illustrate the capabilities of the novel testing system. The metrological investigation showed that the apparatus creates a highly repeatable data set (uncertainty ⩽1% FSO).
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