Analysis of lower limb prosthetic socket interface based on stress and motion measurements
Analysis of lower limb prosthetic socket interface based on stress and motion measurements
The study was designed to establish a biomechanical assessment platform for the lower limb residuum/socket interface as a function of duration and speed of movement. The approach exploits an interface sensor which measures multi-directional stresses at the interface. The corresponding interface coupling motion was assessed using a 3D motion capture system. A longitudinal study, involving a trans-femoral amputee, was conducted with nine repeated level walking sessions over a 12-month period. The effect of walking speed on interface biomechanics was also assessed. Interface peak pressures and shear stresses in the range of 55–59 kPa and 12–19 kPa were measured, respectively, over all sessions in the 12 months study period at the posterior-proximal location of the residuum. The peak pressure and longitudinal shear values were found to fluctuate approximately 11% and 40% as against its maximum value, respectively, over 12 months. In addition, up to 12° of angular coupling and up to 28 mm of pistoning were recorded over a gait cycle, which was found to change by 29% and 45% respectively over the study period. The variation in walking speed, by altering self-selected cadence, resulted in changes of pressure and shear stresses at mid-stance of the gait cycle. In particular, as compared with self-selected cadence, for fast speed, peak pressure and peak longitudinal shear stress decreased by 5% and 33%, respectively. For slow speed, peak pressure and peak longitudinal shear stress increased by 7% and 17%, respectively. The corresponding angular and pistoning revealed a variation of up to 29% and 45%, respectively. This biomechanical assessment approach shows promise in the quantitative assessment of interface kinematics and kinetics for lower limb prosthetics, the usage of which could assist the clinical assessment of prosthetic socket fit.
Lower limb amputee, interface coupling, interface stresses, longitudinal, walking speed
1349-1356
Tang, Jinghua
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Jiang, Liudi
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Mcgrath, Michael
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Bader, Dan
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Laszczak, Piotr
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Moser, David
09874cab-348f-47f9-b018-1c2875d16998
Zahedi, Saeed
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September 2022
Tang, Jinghua
b4b9a22c-fd6d-427a-9ab1-51184c1d2a2c
Jiang, Liudi
374f2414-51f0-418f-a316-e7db0d6dc4d1
Mcgrath, Michael
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Bader, Dan
06079726-5aa3-49cd-ad71-402ab4cd3255
Laszczak, Piotr
83f0c73b-a2d3-4bc6-967f-579497af0754
Moser, David
09874cab-348f-47f9-b018-1c2875d16998
Zahedi, Saeed
fec0d8af-5088-4b23-b94e-2ba1d019850a
Tang, Jinghua, Jiang, Liudi, Mcgrath, Michael, Bader, Dan, Laszczak, Piotr, Moser, David and Zahedi, Saeed
(2022)
Analysis of lower limb prosthetic socket interface based on stress and motion measurements.
Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 236 (9), .
(doi:10.1177/09544119221110712).
Abstract
The study was designed to establish a biomechanical assessment platform for the lower limb residuum/socket interface as a function of duration and speed of movement. The approach exploits an interface sensor which measures multi-directional stresses at the interface. The corresponding interface coupling motion was assessed using a 3D motion capture system. A longitudinal study, involving a trans-femoral amputee, was conducted with nine repeated level walking sessions over a 12-month period. The effect of walking speed on interface biomechanics was also assessed. Interface peak pressures and shear stresses in the range of 55–59 kPa and 12–19 kPa were measured, respectively, over all sessions in the 12 months study period at the posterior-proximal location of the residuum. The peak pressure and longitudinal shear values were found to fluctuate approximately 11% and 40% as against its maximum value, respectively, over 12 months. In addition, up to 12° of angular coupling and up to 28 mm of pistoning were recorded over a gait cycle, which was found to change by 29% and 45% respectively over the study period. The variation in walking speed, by altering self-selected cadence, resulted in changes of pressure and shear stresses at mid-stance of the gait cycle. In particular, as compared with self-selected cadence, for fast speed, peak pressure and peak longitudinal shear stress decreased by 5% and 33%, respectively. For slow speed, peak pressure and peak longitudinal shear stress increased by 7% and 17%, respectively. The corresponding angular and pistoning revealed a variation of up to 29% and 45%, respectively. This biomechanical assessment approach shows promise in the quantitative assessment of interface kinematics and kinetics for lower limb prosthetics, the usage of which could assist the clinical assessment of prosthetic socket fit.
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accepted_manuscript
- Accepted Manuscript
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09544119221110712
- Version of Record
More information
Accepted/In Press date: 8 June 2022
e-pub ahead of print date: 12 July 2022
Published date: September 2022
Additional Information:
Funding Information:
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The authors would like to thank the UK Engineering and Physical Sciences Research Council (EPSRC) and Medical Research Council (MRC) for support.
Publisher Copyright:
© IMechE 2022.
Keywords:
Lower limb amputee, interface coupling, interface stresses, longitudinal, walking speed
Identifiers
Local EPrints ID: 468419
URI: http://eprints.soton.ac.uk/id/eprint/468419
ISSN: 0954-4119
PURE UUID: b892f7ea-706e-4c32-8c10-df0f8c922203
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Date deposited: 15 Aug 2022 16:35
Last modified: 17 Mar 2024 03:47
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Author:
Michael Mcgrath
Author:
Dan Bader
Author:
Piotr Laszczak
Author:
David Moser
Author:
Saeed Zahedi
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