Journal of Rehabilitation Research & Development (JRRD)

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Volume 48 Number 1, 2011
   Pages 31 — 42

Abstract —  Dimensional accuracy of ankle-foot orthoses constructed by rapid customization and manufacturing framework

Elisa S. Schrank, BS;1 Steven J. Stanhope, PhD1-2*

1Department of Mechanical Engineering, 2Department of Health, Nutrition and Exercise Sciences, and Biomechanics and Movement Science Interdisciplinary Program, University of Delaware, Newark, DE

Abstract — Passive-dynamic ankle-foot orthoses (PD-AFOs) constitute a class of ankle braces that rely on material properties and physical features to establish functional characteristics such as bending or rotational stiffness. We have developed a novel framework that combines a fully parameterized PD-AFO computer-aided design (CAD) model and free-form fabrication to rapidly manufacture customized PD-AFOs. The three-dimensional locations of select anatomic landmarks serve to fit customize the PD-AFO CAD model. A virtual orthopedic alignment process and selection of discrete design parameter values further customize the orthosis, which is fabricated via selective laser sintering. CAD models were customized and full-scale orthoses were manufactured for two nondisabled subjects. The surface of one half-scale CAD model was marked with 3 mm hemispherical dimples, and four orthoses were manufactured in different build orientations and positions. Dimensional accuracy was determined by calculating discrepancies between corresponding CAD and fabricated orthoses interdimple distances. Subjective evaluations of the full-scale PD-AFOs following use in gait were positive. Dimension discrepancies were well under a 2 mm tolerance for the four half-scale orthoses. Mean foot plate, strut, and cuff component discrepancies were 0.31 +/- 0.28, 0.34 +/- 0.08, 0.52 +/- 0.39 mm, respectively, and 0.29 +/- 0.23 mm for the overall orthosis. Dimensional accuracy of the rapid customization and manufacturing framework was well within tolerances suggested in the literature.

Key words: ankle, computer-aided design, customization, gait, orthosis, orthotics, parameterization, rehabilitation, selective laser sintering, three-dimensional printing.


View HTML  ¦  View PDF  ¦  Contents Vol. 48, No. 1
This article and any supplementary material should be cited as follows:
Schrank ES, Stanhope SJ. Dimensional accuracy of ankle-foot orthoses constructed by rapid customization and manufacturing framework. J Rehabil Res Dev. 2011; 48(1):31-42.
DOI:10.1682/JRRD.2009.12.0195
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Last Reviewed or Updated  Thursday, January 13, 2011 2:54 PM

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