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Possible Solutions to Mobility Chall...

Roembke, Rebecca,

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Possible Solutions to Mobility Challenges Through Understanding of Ankle Mechanics - Exploring Moments at the Ankle and Socket of Transtibial Amputees on Level Ground and Slope With a Two-Axis aDaptable Ankle /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Possible Solutions to Mobility Challenges Through Understanding of Ankle Mechanics - Exploring Moments at the Ankle and Socket of Transtibial Amputees on Level Ground and Slope With a Two-Axis aDaptable Ankle // Rebecca Roembke.
作者:	Roembke, Rebecca,
面頁冊數:	1 electronic resource (116 pages)
附註:	Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
Contained By:	Dissertations Abstracts International86-12B.
標題:	Mechanical engineering. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=32115606
ISBN:	9798283434568

Possible Solutions to Mobility Challenges Through Understanding of Ankle Mechanics - Exploring Moments at the Ankle and Socket of Transtibial Amputees on Level Ground and Slope With a Two-Axis aDaptable Ankle /
Roembke, Rebecca,

Possible Solutions to Mobility Challenges Through Understanding of Ankle Mechanics - Exploring Moments at the Ankle and Socket of Transtibial Amputees on Level Ground and Slope With a Two-Axis aDaptable Ankle /Rebecca Roembke. - 1 electronic resource (116 pages)

Source: Dissertations Abstracts International, Volume: 86-12, Section: B.

One of the most significant barriers to community walking for individuals with lower limb amputations is navigating slopes and uneven terrains. The existing slope-adapting feet on the market focus on the sagittal plane and do not actively modulate in the frontal plane direction. These feet can also be restrictive due to their heavy weight and high build height. We have developed a semi-active device for transtibial amputees that allows for rotation in both the sagittal and frontal planes. The goal is to use it to control the mechanical moments on the socket, to promote comfort and increased activity.First, we studied how foot alignment affects socket moments and feelings of discomfort. On level ground we found that subjects were more sensitive to sagittal rotations of the ankle than to frontal rotations. In the sagittal plane, larger ankle plantarflexion increased socket flexor moment while increasing ankle dorsiflexion led to larger socket extensor moments during the gait cycle. In contrast, the effects observed in the frontal plane were more variable between individuals, suggesting the need for further investigation. Extreme deviations from the aligned condition induced a feeling of discomfort in many subjects, highlighting the importance of correct alignment and suggesting the ankle may be used for a moment-targeting controlled ankle and can affect perceived comfort and balance.Next, we evaluated the effects of ground slope and compensatory or assistive movements of the prosthetic ankle on socket moments and perceived discomfort and imbalance. Uphill and downhill slopes led to increased socket flexor or extensor moment, respectively; raising the treadmill on the medial side of the prosthesis and the lateral side of the prosthesis led to increased ankle evertor and invertor moments, respectively. Most sagittal plane moment metrics shifted closer to their aligned level ground counterparts as the ankle angle moved in the assistive direction. Frontal plane moment metrics varied among subjects and showed counterintuitive changes in socket moment. These results may be caused by the height of the prosthetic ankle. However, in many cases, subject feedback indicated that they experienced less discomfort with foot angles in the assistive direction for all four slope directions. Future improvements to the prosthetic ankle could include lower ankle center and adding aspects of post-contact adaptation. Further study is needed to quantify ideal ankle angle targets on slopes.

English

ISBN: 9798283434568Subjects--Topical Terms:

649730
Mechanical engineering.
Subjects--Index Terms:

Prosthesis

Possible Solutions to Mobility Challenges Through Understanding of Ankle Mechanics - Exploring Moments at the Ankle and Socket of Transtibial Amputees on Level Ground and Slope With a Two-Axis aDaptable Ankle /
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520 $a One of the most significant barriers to community walking for individuals with lower limb amputations is navigating slopes and uneven terrains. The existing slope-adapting feet on the market focus on the sagittal plane and do not actively modulate in the frontal plane direction. These feet can also be restrictive due to their heavy weight and high build height. We have developed a semi-active device for transtibial amputees that allows for rotation in both the sagittal and frontal planes. The goal is to use it to control the mechanical moments on the socket, to promote comfort and increased activity.First, we studied how foot alignment affects socket moments and feelings of discomfort. On level ground we found that subjects were more sensitive to sagittal rotations of the ankle than to frontal rotations. In the sagittal plane, larger ankle plantarflexion increased socket flexor moment while increasing ankle dorsiflexion led to larger socket extensor moments during the gait cycle. In contrast, the effects observed in the frontal plane were more variable between individuals, suggesting the need for further investigation. Extreme deviations from the aligned condition induced a feeling of discomfort in many subjects, highlighting the importance of correct alignment and suggesting the ankle may be used for a moment-targeting controlled ankle and can affect perceived comfort and balance.Next, we evaluated the effects of ground slope and compensatory or assistive movements of the prosthetic ankle on socket moments and perceived discomfort and imbalance. Uphill and downhill slopes led to increased socket flexor or extensor moment, respectively; raising the treadmill on the medial side of the prosthesis and the lateral side of the prosthesis led to increased ankle evertor and invertor moments, respectively. Most sagittal plane moment metrics shifted closer to their aligned level ground counterparts as the ankle angle moved in the assistive direction. Frontal plane moment metrics varied among subjects and showed counterintuitive changes in socket moment. These results may be caused by the height of the prosthetic ankle. However, in many cases, subject feedback indicated that they experienced less discomfort with foot angles in the assistive direction for all four slope directions. Future improvements to the prosthetic ankle could include lower ankle center and adding aspects of post-contact adaptation. Further study is needed to quantify ideal ankle angle targets on slopes.
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590 $a School code: 0262
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650 4 $a Biomedical engineering. $3 535387
650 4 $a Biomechanics. $3 548685
650 4 $a Biophysics. $3 518360
653 $a Prosthesis
653 $a Sloped walking
653 $a Socket moments
653 $a Ankle dorsiflexion
653 $a Lower limb amputations
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