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Assessing socket fit effects on pressure and shear at a transtibial residuum/socket interface

Assessing socket fit effects on pressure and shear at a transtibial residuum/socket interface
Assessing socket fit effects on pressure and shear at a transtibial residuum/socket interface
Fluctuations in residuum volume during daily activities are known to occur in lower-limb amputees. This can cause frequent changes to fit which cannot be accommodated by commonly-used prosthetic sockets. The real-time effects, if any, of these minor socket fit changes on interface biomechanics have not been studied extensively. Amputees commonly use different layers of socks to accommodate frequent volume fluctuations, enabling adjustment of socket fit. We thus altered socket fit levels via addition/removal of sock layers to a transtibial amputee who habitually-donned 2-sock layers to mimic relatively looser and tighter socket fits. Interface pressure and shear sensors were placed at known prominent load-bearing sites of the transtibial residuum/socket interface, i.e., patellar-tendon (PT), popliteal fossa (PF) and anterior-distal-end (AD), to measure real-time biomechanical interactions during standing and level walking. Although socket fit level was only slightly modified, changes in interface pressure and shear across anatomical sites were still observed. Tighter fit corresponds to notable pressure reduction at AD during early-stance and pressure increase at PT during terminal-stance due to the residuum being pushed up. Shear-to-pressure ratios were used to assess comfort while pressure and shear-time integrals were used to assess tissue health. We observed more notable changes at tissue sites (e.g., AD and PF). Combined evaluation of pressure and shear including shear-to-pressure ratio and time integrals may offer insight for residuum care.
1754-2103
Devin, Kirstie M.
17564d09-f686-4686-a39f-65ce0f4d160b
Tang, Jinghua
b4b9a22c-fd6d-427a-9ab1-51184c1d2a2c
Moser, David
09874cab-348f-47f9-b018-1c2875d16998
Jiang, Liudi
374f2414-51f0-418f-a316-e7db0d6dc4d1
Devin, Kirstie M.
17564d09-f686-4686-a39f-65ce0f4d160b
Tang, Jinghua
b4b9a22c-fd6d-427a-9ab1-51184c1d2a2c
Moser, David
09874cab-348f-47f9-b018-1c2875d16998
Jiang, Liudi
374f2414-51f0-418f-a316-e7db0d6dc4d1

Devin, Kirstie M., Tang, Jinghua, Moser, David and Jiang, Liudi (2023) Assessing socket fit effects on pressure and shear at a transtibial residuum/socket interface. Applied Bionics and Biomechanics, 2023, [3257059]. (doi:10.1155/2023/3257059).

Record type: Article

Abstract

Fluctuations in residuum volume during daily activities are known to occur in lower-limb amputees. This can cause frequent changes to fit which cannot be accommodated by commonly-used prosthetic sockets. The real-time effects, if any, of these minor socket fit changes on interface biomechanics have not been studied extensively. Amputees commonly use different layers of socks to accommodate frequent volume fluctuations, enabling adjustment of socket fit. We thus altered socket fit levels via addition/removal of sock layers to a transtibial amputee who habitually-donned 2-sock layers to mimic relatively looser and tighter socket fits. Interface pressure and shear sensors were placed at known prominent load-bearing sites of the transtibial residuum/socket interface, i.e., patellar-tendon (PT), popliteal fossa (PF) and anterior-distal-end (AD), to measure real-time biomechanical interactions during standing and level walking. Although socket fit level was only slightly modified, changes in interface pressure and shear across anatomical sites were still observed. Tighter fit corresponds to notable pressure reduction at AD during early-stance and pressure increase at PT during terminal-stance due to the residuum being pushed up. Shear-to-pressure ratios were used to assess comfort while pressure and shear-time integrals were used to assess tissue health. We observed more notable changes at tissue sites (e.g., AD and PF). Combined evaluation of pressure and shear including shear-to-pressure ratio and time integrals may offer insight for residuum care.

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More information

Accepted/In Press date: 26 July 2023
Published date: 16 August 2023
Additional Information: Publisher Copyright: © 2023 Kirstie M. Devin et al.

Identifiers

Local EPrints ID: 480479
URI: http://eprints.soton.ac.uk/id/eprint/480479
ISSN: 1754-2103
PURE UUID: 36d6e91b-8ca1-4059-afd3-528b7c999674
ORCID for Kirstie M. Devin: ORCID iD orcid.org/0000-0001-6794-2375
ORCID for Jinghua Tang: ORCID iD orcid.org/0000-0003-3359-5891
ORCID for Liudi Jiang: ORCID iD orcid.org/0000-0002-3400-825X

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Date deposited: 03 Aug 2023 16:31
Last modified: 22 Jun 2024 04:04

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Contributors

Author: Kirstie M. Devin ORCID iD
Author: Jinghua Tang ORCID iD
Author: David Moser
Author: Liudi Jiang ORCID iD

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