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

*Corresponding author for this work

    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 statusPublished - Jun 2019

    Fingerprint

    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 - 2019/6

    Y1 - 2019/6

    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

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    EP - 56

    JO - Medical Engineering and Physics

    JF - Medical Engineering and Physics

    SN - 1350-4533

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