Foot trajectories and loading rates in a transfemoral amputee for six different commercial prosthetic knees: an indication of adaptability

Alireza Abouhossein, Mohammed I. Awad, Hafiz F. Maqbool, Carl Crisp, Todd D. Stewart, Neil Messenger, Robert C. Richardson, Abbas A. Dehghani-Sanij, David A. Bradley

Research output: Contribution to journalArticle

Abstract

Background: The relationship between the functional loading rate and heel velocities was assessed in an active unilateral transfemoral amputee (UTFA) for adaptation to six different commercial prosthetic knees. Objective: To Investigate the short-term process of adaptability for UTFA for two types of prosthetic knees were evaluated, based on the correlation between heel vertical velocity and transient loading rate. Methods: The loading rate was calculated from the slope of ground reaction forces (GRF) and the corre- sponding time. The heel velocities and GRF were obtained by a motion analysis system. Results: Biomechanical adaptation was evident following a short period of prosthetic knee use based upon the mean transient impact (loading rate) and the heel vertical velocity in slow, normal and fast walking. Trend lines of transient impact versus vertical heel velocity for a set of actively controlled vari- able damping (microprocessor) and mechanically passive prosthetic knees were all negatively correlated, except for an amputated leg during normal pace and healthy leg during fast pace. For an amputee to adapt well to a prescribed prosthesis excellent coordination between the intact and amputated limbs is required to control placement of the amputated leg to achieve a gait comparable to healthy subjects. Conclusion: There are many factors such as the hip, knee flexion/extension and the ankle plantarflex- ion/dorsiflexion contributing to the control of the transient impact of an amputee during walking. There- fore, for enhanced control of a prosthetic knee, a multifaceted approach is required. This study showed that UTFA adaption to different prosthetic knees in the short term with slower than self-selected speed is completely achievable based on the negative correlation of ground reaction forces versus linear velocity. Reduced speed may provide the prosthetists with the vision of the amputees’ progression of adaptation with a newly prescribed prosthetic knee.
Original languageEnglish
Pages (from-to)46-56
Number of pages11
JournalMedical Engineering and Physics
Volume68
Early online date9 Apr 2019
DOIs
Publication statusE-pub ahead of print - 9 Apr 2019

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Amputees
Prosthetics
Foot
Knee
Trajectories
Heel
Leg
Walking
Microcomputers
Microprocessor chips
Gait
Ankle
Prostheses and Implants
Damping
Hip
Healthy Volunteers
Extremities
Ions

Cite this

Abouhossein, Alireza ; Awad, Mohammed I. ; Maqbool, Hafiz F. ; Crisp, Carl ; Stewart, Todd D. ; Messenger, Neil ; Richardson, Robert C. ; Dehghani-Sanij, Abbas A. ; Bradley, David A. / Foot trajectories and loading rates in a transfemoral amputee for six different commercial prosthetic knees : an indication of adaptability. In: Medical Engineering and Physics. 2019 ; Vol. 68. pp. 46-56.
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title = "Foot trajectories and loading rates in a transfemoral amputee for six different commercial prosthetic knees: an indication of adaptability",
abstract = "Background: The relationship between the functional loading rate and heel velocities was assessed in an active unilateral transfemoral amputee (UTFA) for adaptation to six different commercial prosthetic knees. Objective: To Investigate the short-term process of adaptability for UTFA for two types of prosthetic knees were evaluated, based on the correlation between heel vertical velocity and transient loading rate. Methods: The loading rate was calculated from the slope of ground reaction forces (GRF) and the corre- sponding time. The heel velocities and GRF were obtained by a motion analysis system. Results: Biomechanical adaptation was evident following a short period of prosthetic knee use based upon the mean transient impact (loading rate) and the heel vertical velocity in slow, normal and fast walking. Trend lines of transient impact versus vertical heel velocity for a set of actively controlled vari- able damping (microprocessor) and mechanically passive prosthetic knees were all negatively correlated, except for an amputated leg during normal pace and healthy leg during fast pace. For an amputee to adapt well to a prescribed prosthesis excellent coordination between the intact and amputated limbs is required to control placement of the amputated leg to achieve a gait comparable to healthy subjects. Conclusion: There are many factors such as the hip, knee flexion/extension and the ankle plantarflex- ion/dorsiflexion contributing to the control of the transient impact of an amputee during walking. There- fore, for enhanced control of a prosthetic knee, a multifaceted approach is required. This study showed that UTFA adaption to different prosthetic knees in the short term with slower than self-selected speed is completely achievable based on the negative correlation of ground reaction forces versus linear velocity. Reduced speed may provide the prosthetists with the vision of the amputees’ progression of adaptation with a newly prescribed prosthetic knee.",
author = "Alireza Abouhossein and Awad, {Mohammed I.} and Maqbool, {Hafiz F.} and Carl Crisp and Stewart, {Todd D.} and Neil Messenger and Richardson, {Robert C.} and Dehghani-Sanij, {Abbas A.} and Bradley, {David A.}",
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Abouhossein, A, Awad, MI, Maqbool, HF, Crisp, C, Stewart, TD, Messenger, N, Richardson, RC, Dehghani-Sanij, AA & Bradley, DA 2019, 'Foot trajectories and loading rates in a transfemoral amputee for six different commercial prosthetic knees: an indication of adaptability' Medical Engineering and Physics, vol. 68, pp. 46-56. https://doi.org/10.1016/j.medengphy.2019.03.014

Foot trajectories and loading rates in a transfemoral amputee for six different commercial prosthetic knees : an indication of adaptability. / Abouhossein, Alireza; Awad, Mohammed I.; Maqbool, Hafiz F.; Crisp, Carl; Stewart, Todd D.; Messenger, Neil; Richardson, Robert C.; Dehghani-Sanij, Abbas A.; Bradley, David A.

In: Medical Engineering and Physics, Vol. 68, 06.2019, p. 46-56.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Foot trajectories and loading rates in a transfemoral amputee for six different commercial prosthetic knees

T2 - an indication of adaptability

AU - Abouhossein, Alireza

AU - Awad, Mohammed I.

AU - Maqbool, Hafiz F.

AU - Crisp, Carl

AU - Stewart, Todd D.

AU - Messenger, Neil

AU - Richardson, Robert C.

AU - Dehghani-Sanij, Abbas A.

AU - Bradley, David A.

PY - 2019/4/9

Y1 - 2019/4/9

N2 - Background: The relationship between the functional loading rate and heel velocities was assessed in an active unilateral transfemoral amputee (UTFA) for adaptation to six different commercial prosthetic knees. Objective: To Investigate the short-term process of adaptability for UTFA for two types of prosthetic knees were evaluated, based on the correlation between heel vertical velocity and transient loading rate. Methods: The loading rate was calculated from the slope of ground reaction forces (GRF) and the corre- sponding time. The heel velocities and GRF were obtained by a motion analysis system. Results: Biomechanical adaptation was evident following a short period of prosthetic knee use based upon the mean transient impact (loading rate) and the heel vertical velocity in slow, normal and fast walking. Trend lines of transient impact versus vertical heel velocity for a set of actively controlled vari- able damping (microprocessor) and mechanically passive prosthetic knees were all negatively correlated, except for an amputated leg during normal pace and healthy leg during fast pace. For an amputee to adapt well to a prescribed prosthesis excellent coordination between the intact and amputated limbs is required to control placement of the amputated leg to achieve a gait comparable to healthy subjects. Conclusion: There are many factors such as the hip, knee flexion/extension and the ankle plantarflex- ion/dorsiflexion contributing to the control of the transient impact of an amputee during walking. There- fore, for enhanced control of a prosthetic knee, a multifaceted approach is required. This study showed that UTFA adaption to different prosthetic knees in the short term with slower than self-selected speed is completely achievable based on the negative correlation of ground reaction forces versus linear velocity. Reduced speed may provide the prosthetists with the vision of the amputees’ progression of adaptation with a newly prescribed prosthetic knee.

AB - Background: The relationship between the functional loading rate and heel velocities was assessed in an active unilateral transfemoral amputee (UTFA) for adaptation to six different commercial prosthetic knees. Objective: To Investigate the short-term process of adaptability for UTFA for two types of prosthetic knees were evaluated, based on the correlation between heel vertical velocity and transient loading rate. Methods: The loading rate was calculated from the slope of ground reaction forces (GRF) and the corre- sponding time. The heel velocities and GRF were obtained by a motion analysis system. Results: Biomechanical adaptation was evident following a short period of prosthetic knee use based upon the mean transient impact (loading rate) and the heel vertical velocity in slow, normal and fast walking. Trend lines of transient impact versus vertical heel velocity for a set of actively controlled vari- able damping (microprocessor) and mechanically passive prosthetic knees were all negatively correlated, except for an amputated leg during normal pace and healthy leg during fast pace. For an amputee to adapt well to a prescribed prosthesis excellent coordination between the intact and amputated limbs is required to control placement of the amputated leg to achieve a gait comparable to healthy subjects. Conclusion: There are many factors such as the hip, knee flexion/extension and the ankle plantarflex- ion/dorsiflexion contributing to the control of the transient impact of an amputee during walking. There- fore, for enhanced control of a prosthetic knee, a multifaceted approach is required. This study showed that UTFA adaption to different prosthetic knees in the short term with slower than self-selected speed is completely achievable based on the negative correlation of ground reaction forces versus linear velocity. Reduced speed may provide the prosthetists with the vision of the amputees’ progression of adaptation with a newly prescribed prosthetic knee.

U2 - 10.1016/j.medengphy.2019.03.014

DO - 10.1016/j.medengphy.2019.03.014

M3 - Article

VL - 68

SP - 46

EP - 56

JO - Medical Engineering and Physics

JF - Medical Engineering and Physics

SN - 1350-4533

ER -