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...

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Main Authors: Kirstie M. Devin, Jinghua Tang, David Moser, Liudi Jiang
Format: Article
Language:English
Published: Wiley 2023-01-01
Series:Applied Bionics and Biomechanics
Online Access:http://dx.doi.org/10.1155/2023/3257059
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author Kirstie M. Devin
Jinghua Tang
David Moser
Liudi Jiang
author_facet Kirstie M. Devin
Jinghua Tang
David Moser
Liudi Jiang
author_sort Kirstie M. Devin
collection DOAJ
description 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 two-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 (AD) end, 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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issn 1754-2103
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series Applied Bionics and Biomechanics
spelling doaj-art-1730553af7d5413eb443fc29c957e2572025-02-03T05:48:42ZengWileyApplied Bionics and Biomechanics1754-21032023-01-01202310.1155/2023/3257059Assessing Socket Fit Effects on Pressure and Shear at a Transtibial Residuum/Socket InterfaceKirstie M. Devin0Jinghua Tang1David Moser2Liudi Jiang3School of EngineeringSchool of EngineeringSchool of EngineeringSchool of EngineeringFluctuations 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 two-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 (AD) end, 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.http://dx.doi.org/10.1155/2023/3257059
spellingShingle Kirstie M. Devin
Jinghua Tang
David Moser
Liudi Jiang
Assessing Socket Fit Effects on Pressure and Shear at a Transtibial Residuum/Socket Interface
Applied Bionics and Biomechanics
title Assessing Socket Fit Effects on Pressure and Shear at a Transtibial Residuum/Socket Interface
title_full Assessing Socket Fit Effects on Pressure and Shear at a Transtibial Residuum/Socket Interface
title_fullStr Assessing Socket Fit Effects on Pressure and Shear at a Transtibial Residuum/Socket Interface
title_full_unstemmed Assessing Socket Fit Effects on Pressure and Shear at a Transtibial Residuum/Socket Interface
title_short Assessing Socket Fit Effects on Pressure and Shear at a Transtibial Residuum/Socket Interface
title_sort assessing socket fit effects on pressure and shear at a transtibial residuum socket interface
url http://dx.doi.org/10.1155/2023/3257059
work_keys_str_mv AT kirstiemdevin assessingsocketfiteffectsonpressureandshearatatranstibialresiduumsocketinterface
AT jinghuatang assessingsocketfiteffectsonpressureandshearatatranstibialresiduumsocketinterface
AT davidmoser assessingsocketfiteffectsonpressureandshearatatranstibialresiduumsocketinterface
AT liudijiang assessingsocketfiteffectsonpressureandshearatatranstibialresiduumsocketinterface