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Development of a residuum/socket interface simulator for lower limb prosthetics

Development of a residuum/socket interface simulator for lower limb prosthetics
Development of a residuum/socket interface simulator for lower limb prosthetics
Mechanical coupling at the interface between lower limb residua and prosthetic sockets plays an important role in assessing socket fitting and tissue health. However, most research lab–based lower limb prosthetic simulators to-date have implemented a rigid socket coupling. This study describes the fabrication and implementation of a lower limb residuum/socket interface simulator, designed to reproduce the forces and moments present during the key loading phases of amputee walking. An artificial residuum made with model bones encased in silicone was used, mimicking the compliant mechanical loading of a real residuum/socket interface. A 6-degree-of-freedom load cell measured the overall kinetics, having previously been incorporated into an amputee’s prosthesis to collect reference data. The developed simulator was compared to a setup where a rigid pylon replaced the artificial residuum. A maximum uniaxial load of 850 N was applied, comparable to the peak vertical ground reaction force component during amputee walking. Load cell outputs from both pylon and residuum setups were compared. During weight acceptance, when including the artificial residuum, compression decreased by 10%, while during push off, sagittal bending and anterior–posterior shear showed a 25% increase and 34% decrease, respectively. Such notable difference by including a compliant residuum further highlighted the need for such an interface simulator. Subsequently, the simulator was adjusted to produce key load cell outputs briefly aligning with those from amputee walking. Force sensing resistors were deployed at load bearing anatomic locations on the residuum/socket interface to measure pressures and were compared to those cited in the literature for similar locations. The development of such a novel simulator provides an objective adjunct, using commonly available mechanical test machines. It could potentially be used to provide further insight into socket design, fit and the complex load transfer mechanics at the residuum/socket interface, as well as to evaluate the structural performance of prostheses.
0954-4119
235-242
Mcgrath, Michael
32b5ce9d-eada-4edb-9c2e-ebc4d05142e9
Gao, Jianliang
84cfd2ed-c48c-4d9f-9e7c-49afc7cc6e4d
Tang, Jing
b4b9a22c-fd6d-427a-9ab1-51184c1d2a2c
Laszczak, Piotr
ea4976f2-006b-4be6-b49a-9d4a88c1a4bf
Jiang, Liudi
374f2414-51f0-418f-a316-e7db0d6dc4d1
Bader, Dan
9884d4f6-2607-4d48-bf0c-62bdcc0d1dbf
Moser, David
09874cab-348f-47f9-b018-1c2875d16998
Zahedi, Saeed
4a233dc6-995d-486d-becc-38e1a7d7e499
Mcgrath, Michael
32b5ce9d-eada-4edb-9c2e-ebc4d05142e9
Gao, Jianliang
84cfd2ed-c48c-4d9f-9e7c-49afc7cc6e4d
Tang, Jing
b4b9a22c-fd6d-427a-9ab1-51184c1d2a2c
Laszczak, Piotr
ea4976f2-006b-4be6-b49a-9d4a88c1a4bf
Jiang, Liudi
374f2414-51f0-418f-a316-e7db0d6dc4d1
Bader, Dan
9884d4f6-2607-4d48-bf0c-62bdcc0d1dbf
Moser, David
09874cab-348f-47f9-b018-1c2875d16998
Zahedi, Saeed
4a233dc6-995d-486d-becc-38e1a7d7e499

Mcgrath, Michael, Gao, Jianliang, Tang, Jing, Laszczak, Piotr, Jiang, Liudi, Bader, Dan, Moser, David and Zahedi, Saeed (2017) Development of a residuum/socket interface simulator for lower limb prosthetics. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 231 (3), 235-242. (doi:10.1177/0954411917690764).

Record type: Article

Abstract

Mechanical coupling at the interface between lower limb residua and prosthetic sockets plays an important role in assessing socket fitting and tissue health. However, most research lab–based lower limb prosthetic simulators to-date have implemented a rigid socket coupling. This study describes the fabrication and implementation of a lower limb residuum/socket interface simulator, designed to reproduce the forces and moments present during the key loading phases of amputee walking. An artificial residuum made with model bones encased in silicone was used, mimicking the compliant mechanical loading of a real residuum/socket interface. A 6-degree-of-freedom load cell measured the overall kinetics, having previously been incorporated into an amputee’s prosthesis to collect reference data. The developed simulator was compared to a setup where a rigid pylon replaced the artificial residuum. A maximum uniaxial load of 850 N was applied, comparable to the peak vertical ground reaction force component during amputee walking. Load cell outputs from both pylon and residuum setups were compared. During weight acceptance, when including the artificial residuum, compression decreased by 10%, while during push off, sagittal bending and anterior–posterior shear showed a 25% increase and 34% decrease, respectively. Such notable difference by including a compliant residuum further highlighted the need for such an interface simulator. Subsequently, the simulator was adjusted to produce key load cell outputs briefly aligning with those from amputee walking. Force sensing resistors were deployed at load bearing anatomic locations on the residuum/socket interface to measure pressures and were compared to those cited in the literature for similar locations. The development of such a novel simulator provides an objective adjunct, using commonly available mechanical test machines. It could potentially be used to provide further insight into socket design, fit and the complex load transfer mechanics at the residuum/socket interface, as well as to evaluate the structural performance of prostheses.

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Accepted/In Press date: 5 January 2017
e-pub ahead of print date: 6 February 2017
Published date: 1 March 2017
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 403881
URI: http://eprints.soton.ac.uk/id/eprint/403881
ISSN: 0954-4119
PURE UUID: 1f1193f0-5b97-49ce-937f-c6f5512c9d7b
ORCID for Jing Tang: ORCID iD orcid.org/0000-0003-3359-5891
ORCID for Liudi Jiang: ORCID iD orcid.org/0000-0002-3400-825X
ORCID for Dan Bader: ORCID iD orcid.org/0000-0002-1208-3507

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Date deposited: 15 Dec 2016 11:53
Last modified: 07 Oct 2020 05:28

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