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Validity and reliability of a novel 3D scanner for assessment of the shape and volume of amputees’ residual limb models


Reference:

Seminati, E., Canepa Talamas, D., Young, M., Twiste, M., Dhokia, V. and Bilzon, J., 2017. Validity and reliability of a novel 3D scanner for assessment of the shape and volume of amputees’ residual limb models. PLoS ONE

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    Official URL:

    https://doi.org/10.1371/journal.pone.0184498

    Abstract

    Background: Objective assessment methods to monitor residual limb volume following lower-limb amputation are required to enhance practitioner-led prosthetic fitting. Computer aided systems, including 3D scanners, present numerous advantages and the recent Artec Eva scanner, based on laser free technology, could potentially be an effective solution for monitoring residual limb volumes. Purpose: The aim of this study was to assess the validity and reliability of the Artec Eva scanner (practical measurement) against a high precision laser 3D scanner (criterion measurement) for the determination of residual limb model shape and volume. Methods: Three observers completed three repeat assessments of ten residual limb models, using both the scanners. Validity of the Artec Eva scanner was assessed (mean percentage error <2%) and Bland-Altman statistics were adopted to assess the agreement between the two scanners. Intra and inter-rater reliability (repeatability coefficient <5%) of the Artec Eva scanner was calculated for measuring indices of residual limb model volume and shape (i.e. residual limb cross sectional areas and perimeters). Results: Residual limb model volumes ranged from 885 to 4399 ml. Mean percentage error of the Artec Eva scanner (validity) was 1.4% of the criterion volumes. Correlation coefficients between the Artec Eva and the Romer determined variables were higher than 0.9. Volume intra-rater and inter-rater reliability coefficients were 0.5% and 0.7%, respectively. Shape percentage maximal error was 2% at the distal end of the residual limb, with intra-rater reliability coefficients presenting the lowest errors (0.2%), both for cross sectional areas and perimeters of the residual limb models. Conclusion: The Artec Eva scanner is a valid and reliable method for assessing residual limb model shapes and volumes. While the method needs to be tested on human residual limbs and the results compared with the current system used in clinical practice, it has the potential to quantify shape and volume fluctuations with greater resolution.

    Details

    Item Type Non-academic press
    CreatorsSeminati, E., Canepa Talamas, D., Young, M., Twiste, M., Dhokia, V. and Bilzon, J.
    DOI10.1371/journal.pone.0184498
    Uncontrolled Keywordslower limb amputees,residuum volume,socket design,reliability and validity
    DepartmentsFaculty of Humanities & Social Sciences > Health
    Faculty of Engineering & Design > Mechanical Engineering
    Research Centres & Institutes > Institute for Policy Research
    Faculty of Science > Computer Science
    Research CentresCentre for Regenerative Medicine
    Publisher StatementPONE_D_17_24279R1_FTC_PURE.docx: The final publication is available at PLOS One via https://doi.org/10.1371/journal.pone.0184498
    StatusPublished
    ID Code56965

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