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Towards Effective Fall Prevention Me...

Shirota, Camila.

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Towards Effective Fall Prevention Mechanisms in Lower-Limb Prostheses: Trip Recovery in Transfemoral Amputees.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Towards Effective Fall Prevention Mechanisms in Lower-Limb Prostheses: Trip Recovery in Transfemoral Amputees./
作者:	Shirota, Camila.
面頁冊數:	151 p.
附註:	Source: Dissertation Abstracts International, Volume: 76-08(E), Section: B.
Contained By:	Dissertation Abstracts International76-08B(E).
標題:	Biomedical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3686626
ISBN:	9781321634334

Towards Effective Fall Prevention Mechanisms in Lower-Limb Prostheses: Trip Recovery in Transfemoral Amputees.
Shirota, Camila.

Towards Effective Fall Prevention Mechanisms in Lower-Limb Prostheses: Trip Recovery in Transfemoral Amputees. - 151 p.

Source: Dissertation Abstracts International, Volume: 76-08(E), Section: B.

Thesis (Ph.D.)--Northwestern University, 2015.

Transfemoral (above-knee) amputees are prone to falling, indicating that current prevention methods are lacking. Microprocessor-controlled and powered prostheses could improve responses to perturbations, but prosthetic responses that facilitate balance recovery are unclear. Trips in able-bodied subjects elicit stereotypical movement patterns (recovery strategies) related to perturbation timing throughout swing phase; however, which strategy to use in response to a specific perturbation is poorly understood. Further, knowledge of the effects of amputation on trip recovery is limited. Identification of the user's intention, to coordinate the prostheses' response, has yet to be studied throughout swing phase. This dissertation aims at understanding how amputees attempt recovering from trips, and proposes a method to automatically identify their intended strategy during recovery.

ISBN: 9781321634334Subjects--Topical Terms:

535387
Biomedical engineering.

Towards Effective Fall Prevention Mechanisms in Lower-Limb Prostheses: Trip Recovery in Transfemoral Amputees.
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245 1 0 $a Towards Effective Fall Prevention Mechanisms in Lower-Limb Prostheses: Trip Recovery in Transfemoral Amputees.
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500 $a Source: Dissertation Abstracts International, Volume: 76-08(E), Section: B.
500 $a Adviser: Todd A. Kuiken.
502 $a Thesis (Ph.D.)--Northwestern University, 2015.
520 $a Transfemoral (above-knee) amputees are prone to falling, indicating that current prevention methods are lacking. Microprocessor-controlled and powered prostheses could improve responses to perturbations, but prosthetic responses that facilitate balance recovery are unclear. Trips in able-bodied subjects elicit stereotypical movement patterns (recovery strategies) related to perturbation timing throughout swing phase; however, which strategy to use in response to a specific perturbation is poorly understood. Further, knowledge of the effects of amputation on trip recovery is limited. Identification of the user's intention, to coordinate the prostheses' response, has yet to be studied throughout swing phase. This dissertation aims at understanding how amputees attempt recovering from trips, and proposes a method to automatically identify their intended strategy during recovery.
520 $a A custom-made device tripped able-bodied and transfemoral amputee subjects multiple times throughout swing phase during treadmill walking. Data collected included motion of the pelvis and lower-limbs, and muscle activity (EMG) from both legs. Kinematic patterns of the tripped foot from trip to foot-strike were used to sort recovery strategies. Linear discriminant analysis classifiers were used to detect trips and identify recovery strategies in able-bodied subjects and the prosthesis side of transfemoral amputees using tripped limb kinematic data, tripped thigh EMG, or fusion (combined) data.
520 $a In able-bodied subjects, perturbation duration did not affect initial strategy selection, but could force a switch between strategies. Transfemoral amputees used typical able-bodied and amputee-specific (hopping and skipping) strategies. Patterns of recovery in able-bodied subjects were less similar to responses on the sound side than on the prosthesis side. Using fusion data to classify strategies resulted in low and least variable errors across subjects.
520 $a This dissertation sets the foundation for real-time trip recovery mechanisms in transfemoral prostheses. It supports that typical able-bodied strategies could potentially avoid falls from prosthesis side trips, as they align with amputees' intent. The 50ms classification delay is similar to latencies of able-bodied responses and should allow effective prosthesis responses. Further, recovery from sound side trips should be addressed, as it was restricted by the prosthesis' limited ability to count-act the perturbation. This dissertation's framework could be used to investigate recovery from other types of perturbations.
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