The University of Southampton
University of Southampton Institutional Repository

Biomechanical interaction at a transtibial residuum/socket interface during ambulation

Biomechanical interaction at a transtibial residuum/socket interface during ambulation
Biomechanical interaction at a transtibial residuum/socket interface during ambulation
1. Introduction
The socket interface for lower limb amputees is critical for comfort,
safety and overall rehabilitation outcomes. There are limited studies
focused on dynamic socket interface biomechanical interactions during
ambulation, especially for transtibial (TT) amputees [1]. Combined
measurement of pressure and shear at load bearing regions of the
interface is important to provide biomechanical understanding of the
complex loading profile during ambulation. Thin flexible tri-axial
pressure and shear (TRIPS) sensors [2] capable of measuring these
multidirectional forces were reported for transfemoral amputees [3,4]
though TT residuum/socket interface study has not been reported.

2. Research question
We aim to study the TT residuum/socket interface biomechanical
interaction as a function of gait cycle and terrain.

3. Methods
Three TRIPS sensors were placed at kick-point (KP), patella-tendon
(PT), and superior popliteal fossa (SPF) of inner socket wall (Fig. 1a)
of a male TT participant (body mass 81kg, height 183cm, total surface
bearing socket). The participant walked at a self-selected pace over a
level surface, then up and down an 8◦ ramp.

4. Results
Fig. 1b-d showed mean±1SD of pressure (P), circumferential shear
(SC) and longitudinal shear (SL) as a function of gait cycles. For level
walking, pressures at weight acceptance (WA) are 335±9kPa (KP), 76
±2kPa (PT) and 94±2kPa (SPF). Fig. 1 b-dii shows SC at KP reaches -137±4kPa in WA while negligible at PT and SPF. Fig. 1biii and diii
show SL at KP (124±5kPa) and SPF (19±2kPa) act in proximal direction
in WA, whereas SL in Fig. 1ciii acts distally at PT (-6±0.5kPa).

5. Discussion
P, SC and SL dominate at KP compared with those from PT and SPF.
At KP, pressure in WA (335±9kPa) is higher than that in terminal stance
(TS) (201±8kPa). In contrast, pressure at PT in WA (76±2kPa) is lower
than that for TS (103±3kPa). This indicates higher PT pressure is
required during TS to propel limb forward. High peak values of SC at KP
(bii) of -137±4kPa (WA) and -91±4kPa (TS) suggests significant
transverse rotation while SL at KP (124±5kPa) (biii) also suggests
simultaneous pistoning effect during WA.

When walking down a ramp, enhanced pistoning resulted in
increased S L at KP and SPF compared with level walking (biii and diii).
Also, greater braking force caused slightly higher SC at KP and SPF,
indicating increased effort to maintain balance. When walking up a
ramp, P, SC and SL increased at PT compared with level walking as the knee propels forward onto higher ground.
0966-6362
S358-S359
Devin, Kirstie Marie
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 Marie
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 Marie, Tang, Jinghua, Moser, David and Jiang, Liudi (2022) Biomechanical interaction at a transtibial residuum/socket interface during ambulation. Gait & Posture, 97 (1), S358-S359. (doi:10.1016/j.gaitpost.2022.07.213).

Record type: Article

Abstract

1. Introduction
The socket interface for lower limb amputees is critical for comfort,
safety and overall rehabilitation outcomes. There are limited studies
focused on dynamic socket interface biomechanical interactions during
ambulation, especially for transtibial (TT) amputees [1]. Combined
measurement of pressure and shear at load bearing regions of the
interface is important to provide biomechanical understanding of the
complex loading profile during ambulation. Thin flexible tri-axial
pressure and shear (TRIPS) sensors [2] capable of measuring these
multidirectional forces were reported for transfemoral amputees [3,4]
though TT residuum/socket interface study has not been reported.

2. Research question
We aim to study the TT residuum/socket interface biomechanical
interaction as a function of gait cycle and terrain.

3. Methods
Three TRIPS sensors were placed at kick-point (KP), patella-tendon
(PT), and superior popliteal fossa (SPF) of inner socket wall (Fig. 1a)
of a male TT participant (body mass 81kg, height 183cm, total surface
bearing socket). The participant walked at a self-selected pace over a
level surface, then up and down an 8◦ ramp.

4. Results
Fig. 1b-d showed mean±1SD of pressure (P), circumferential shear
(SC) and longitudinal shear (SL) as a function of gait cycles. For level
walking, pressures at weight acceptance (WA) are 335±9kPa (KP), 76
±2kPa (PT) and 94±2kPa (SPF). Fig. 1 b-dii shows SC at KP reaches -137±4kPa in WA while negligible at PT and SPF. Fig. 1biii and diii
show SL at KP (124±5kPa) and SPF (19±2kPa) act in proximal direction
in WA, whereas SL in Fig. 1ciii acts distally at PT (-6±0.5kPa).

5. Discussion
P, SC and SL dominate at KP compared with those from PT and SPF.
At KP, pressure in WA (335±9kPa) is higher than that in terminal stance
(TS) (201±8kPa). In contrast, pressure at PT in WA (76±2kPa) is lower
than that for TS (103±3kPa). This indicates higher PT pressure is
required during TS to propel limb forward. High peak values of SC at KP
(bii) of -137±4kPa (WA) and -91±4kPa (TS) suggests significant
transverse rotation while SL at KP (124±5kPa) (biii) also suggests
simultaneous pistoning effect during WA.

When walking down a ramp, enhanced pistoning resulted in
increased S L at KP and SPF compared with level walking (biii and diii).
Also, greater braking force caused slightly higher SC at KP and SPF,
indicating increased effort to maintain balance. When walking up a
ramp, P, SC and SL increased at PT compared with level walking as the knee propels forward onto higher ground.

Text
1-s2.0-S0966636222004155-main - Version of Record
Restricted to Repository staff only
Request a copy

More information

e-pub ahead of print date: 17 September 2022
Published date: 17 September 2022

Identifiers

Local EPrints ID: 471313
URI: http://eprints.soton.ac.uk/id/eprint/471313
ISSN: 0966-6362
PURE UUID: 6ac5768b-ff53-4a15-a818-e459ae8b5dfe
ORCID for Jinghua Tang: ORCID iD orcid.org/0000-0003-3359-5891
ORCID for Liudi Jiang: ORCID iD orcid.org/0000-0002-3400-825X

Catalogue record

Date deposited: 02 Nov 2022 17:47
Last modified: 09 Nov 2022 02:52

Export record

Altmetrics

Contributors

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

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×