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Microprocessor knees with ‘standing support’ and articulating, hydraulic ankles improve balance control and inter-limb loading during quiet standing
INTRODUCTION: Trans-femoral amputees are at risk of musculoskeletal problems that are in part caused by loading asymmetry during activities, such as prolonged standing, particularly on uneven or sloped ground. METHODS: Four prosthetic conditions were tested; microprocessor knee ‘standing support’ mo...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
SAGE Publications
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6453061/ https://www.ncbi.nlm.nih.gov/pubmed/31191952 http://dx.doi.org/10.1177/2055668318795396 |
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author | McGrath, Michael Laszczak, Piotr Zahedi, Saeed Moser, David |
author_facet | McGrath, Michael Laszczak, Piotr Zahedi, Saeed Moser, David |
author_sort | McGrath, Michael |
collection | PubMed |
description | INTRODUCTION: Trans-femoral amputees are at risk of musculoskeletal problems that are in part caused by loading asymmetry during activities, such as prolonged standing, particularly on uneven or sloped ground. METHODS: Four prosthetic conditions were tested; microprocessor knee ‘standing support’ mode activated (ON) and deactivated (OFF), combined with a rigidly attached foot (RA) and with an articulating, hydraulic ankle-foot (HA). Five trans-femoral amputees and five able-bodied controls were measured using a motion capture system and a force plate while standing, facing down a 5° slope. Ground reaction force distributions and centre-of-pressure root-mean-square (COP RMS) were calculated as outcome measures. RESULTS: Compensatory kinematic adjustments were observed for RA conditions but not for HA conditions. HA-OFF reduced ground reaction force degree-of-asymmetry for all five amputees, compared to RA-OFF. RA-ON reduced ground reaction force degree-of-asymmetry for four amputees, compared to RA-OFF. In terms of balance, the HA conditions reduced the mean inter-limb COP RMS by 24–25% compared to equivalent RA conditions, while ON conditions reduced it by 9–11%, compared to equivalent OFF conditions. CONCLUSIONS: It is important to consider both prosthetic knee and ankle technologies when prescribing devices to trans-femoral amputees. The combination of hydraulic ankle and knee standing support technologies produced outcomes closest to normal biomechanics. |
format | Online Article Text |
id | pubmed-6453061 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | SAGE Publications |
record_format | MEDLINE/PubMed |
spelling | pubmed-64530612019-06-12 Microprocessor knees with ‘standing support’ and articulating, hydraulic ankles improve balance control and inter-limb loading during quiet standing McGrath, Michael Laszczak, Piotr Zahedi, Saeed Moser, David J Rehabil Assist Technol Eng Special Collection: Smart Limb Technology: Original Research Article INTRODUCTION: Trans-femoral amputees are at risk of musculoskeletal problems that are in part caused by loading asymmetry during activities, such as prolonged standing, particularly on uneven or sloped ground. METHODS: Four prosthetic conditions were tested; microprocessor knee ‘standing support’ mode activated (ON) and deactivated (OFF), combined with a rigidly attached foot (RA) and with an articulating, hydraulic ankle-foot (HA). Five trans-femoral amputees and five able-bodied controls were measured using a motion capture system and a force plate while standing, facing down a 5° slope. Ground reaction force distributions and centre-of-pressure root-mean-square (COP RMS) were calculated as outcome measures. RESULTS: Compensatory kinematic adjustments were observed for RA conditions but not for HA conditions. HA-OFF reduced ground reaction force degree-of-asymmetry for all five amputees, compared to RA-OFF. RA-ON reduced ground reaction force degree-of-asymmetry for four amputees, compared to RA-OFF. In terms of balance, the HA conditions reduced the mean inter-limb COP RMS by 24–25% compared to equivalent RA conditions, while ON conditions reduced it by 9–11%, compared to equivalent OFF conditions. CONCLUSIONS: It is important to consider both prosthetic knee and ankle technologies when prescribing devices to trans-femoral amputees. The combination of hydraulic ankle and knee standing support technologies produced outcomes closest to normal biomechanics. SAGE Publications 2018-10-03 /pmc/articles/PMC6453061/ /pubmed/31191952 http://dx.doi.org/10.1177/2055668318795396 Text en © The Author(s) 2018 http://creativecommons.org/licenses/by-nc/4.0/ Creative Commons Non Commercial CC BY-NC: This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage). |
spellingShingle | Special Collection: Smart Limb Technology: Original Research Article McGrath, Michael Laszczak, Piotr Zahedi, Saeed Moser, David Microprocessor knees with ‘standing support’ and articulating, hydraulic ankles improve balance control and inter-limb loading during quiet standing |
title | Microprocessor knees with ‘standing support’ and articulating,
hydraulic ankles improve balance control and inter-limb loading during quiet
standing |
title_full | Microprocessor knees with ‘standing support’ and articulating,
hydraulic ankles improve balance control and inter-limb loading during quiet
standing |
title_fullStr | Microprocessor knees with ‘standing support’ and articulating,
hydraulic ankles improve balance control and inter-limb loading during quiet
standing |
title_full_unstemmed | Microprocessor knees with ‘standing support’ and articulating,
hydraulic ankles improve balance control and inter-limb loading during quiet
standing |
title_short | Microprocessor knees with ‘standing support’ and articulating,
hydraulic ankles improve balance control and inter-limb loading during quiet
standing |
title_sort | microprocessor knees with ‘standing support’ and articulating,
hydraulic ankles improve balance control and inter-limb loading during quiet
standing |
topic | Special Collection: Smart Limb Technology: Original Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6453061/ https://www.ncbi.nlm.nih.gov/pubmed/31191952 http://dx.doi.org/10.1177/2055668318795396 |
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