Upper limb activity in myoelectric prosthesis users is biased towards the intact limb and appears unrelated to goal-directed task performance

Chadwell, AEA ORCID: https://orcid.org/0000-0002-9101-5202, Kenney, LPJ ORCID: https://orcid.org/0000-0003-2164-3892, Granat, MH ORCID: https://orcid.org/0000-0002-0722-2760, Thies, SBA ORCID: https://orcid.org/0000-0001-9889-2243, Head, JS ORCID: https://orcid.org/0000-0002-3483-3903, Galpin, AJ ORCID: https://orcid.org/0000-0002-7699-8706 and Baker, RD ORCID: https://orcid.org/0000-0003-3555-3425 2018, 'Upper limb activity in myoelectric prosthesis users is biased towards the intact limb and appears unrelated to goal-directed task performance' , Scientific Reports, 8 , #11084.

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Studies of the effectiveness of prosthetic hands involve assessing user performance on functional tasks in the lab/clinic, sometimes combined with self-report of real-world use. In this paper we compare real-world upper limb activity between a group of 20 myoelectric prosthesis users and 20 anatomically intact adults. Activity was measured from wrist-worn accelerometers over a 7-day period. The temporal patterns in upper limb activity are presented and the balance of activity between the two limbs quantified. We also evaluated the prosthesis users’ performance on a goal-directed task, characterised using measures including task success rate, completion time, gaze behaviour patterns, and kinematics (e.g. variability and patterns in hand aperture). Prosthesis users were heavily reliant on their intact limb during everyday life, in contrast to anatomically intact adults who demonstrated similar reliance on both upper limbs. There was no significant correlation between the amount of time a prosthesis was worn and reliance on the intact limb, and there was no significant correlation between either of these measures and any of the assessed kinematic and gaze-related measures of performance. We found participants who had been prescribed a prosthesis for longer to demonstrate more symmetry in their overall upper limb activity, although this was not reflected in the symmetry of unilateral limb use. With the exception of previously published case studies, this is the first report of real world upper limb activity in myoelectric prosthesis users and confirms the widely held belief that users are heavily reliant on their intact limb.

Item Type: Article
Schools: Schools > School of Health and Society > Centre for Health Sciences Research
Journal or Publication Title: Scientific Reports
Publisher: Nature Publishing Group
ISSN: 2045-2322
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Depositing User: USIR Admin
Date Deposited: 05 Jul 2018 08:41
Last Modified: 15 Feb 2022 23:27
URI: https://usir.salford.ac.uk/id/eprint/47704

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