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Dudley S. Childress
Northwestern University
81Publications
25H-index
2,098Citations
Publications 73
Newest
#1Georgios A. Bertos (NU: Northwestern University)H-Index: 1
#2Dudley S. Childress (NU: Northwestern University)H-Index: 25
Last.Steven A. Gard (NU: Northwestern University)H-Index: 23
view all 3 authors...
Objective: To design better shock absorbing prosthetic components, walking machines, or bionic legs, values and properties of the mechanical impedance of the locomotor system of able-bodied ambulators need to be determined. Methods: The representation of a simple 2nd-order shock absorption component (i.e., effective body mass, M_{e}, supported by a stiffness, {k}, and damping, {B}, in parallel) was incorporated into a previously proposed rocker-based inverted pendulum model of walking t...
Source
#1Andrew H. HansenH-Index: 22
#2Dudley S. Childress (NU: Northwestern University)H-Index: 25
1 CitationsSource
#1Andrew H. Hansen (NU: Northwestern University)H-Index: 22
#2Steve C. Miff (NU: Northwestern University)H-Index: 6
Last.Margrit R. Meier (NU: Northwestern University)H-Index: 9
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The net external energy of the biologic human ankle joint and of some lower limb prosthetic ankle-foot systems was examined during gait initiation. The purpose of the study was to better understand the ankle's behavior during the acceleration phase of walking for use in the design of improved lower limb prostheses and orthoses. Quantitative gait data were collected from 10 able-bodied subjects and 10 persons with unilateral transtibial amputations during gait initiation. The behaviors of the bio...
10 CitationsSource
#1Andrew H. HansenH-Index: 22
#2Dudley S. Childress (NU: Northwestern University)H-Index: 25
Purpose. The purpose of this article is to provide an overview of our previous work on roll-over shapes, which are the effective rocker shapes that the lower limb systems conform to during walking.Method. This article is a summary of several recently published articles from the Northwestern University Prosthetics Research Laboratory and Rehabilitation Engineering Research Program on the topic of roll-over shapes. The roll-over shape is a measurement of centre of pressure of the ground reaction f...
31 CitationsSource
1 CitationsSource
#1Yeongchi Wu (NU: Northwestern University)H-Index: 4
#2Hector R. CasanovaH-Index: 4
Last.Dudley S. Childress (NU: Northwestern University)H-Index: 25
view all 5 authors...
This paper describes a new casting system for transtibial socket fabrication. Like the earlier CIR Sand Casting System, the CIR Casting System is based on the ‘dilatancy’ principle that is similar to the packaging process for coffee beans by which loose beans become a solid mass when a vacuum is applied. The main difference from the CIR Sand Casting System is that the CIR Casting System uses light-weight, polystyrene beads in place of silica sand as the primary material for casting the negative ...
12 CitationsSource
#1Yeongchi WuH-Index: 4
#2Hector R. CasanovaH-Index: 4
Last.Dudley S. ChildressH-Index: 25
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Cet article decrit un nouveau systeme de moulage pour la fabrication des emboitures transtibiales. Comme l'ancien systeme de moulage au sable CIR, le systeme de moulage CIR est fonde sur le principe de « dilatance » similaire au processus d'emballage du cafe en grains par lequel les grains se transforment en masse solide lorsque l'on applique le vide. La principale difference par rapport au systeme de moulage au sable CIR est que le systeme de moulage CIR utilise des perles de polystyrene legere...
4 CitationsSource
#1Steve C. Miff (NU: Northwestern University)H-Index: 6
#2Andrew H. Hansen (NU: Northwestern University)H-Index: 22
Last.Margrit R. Meier (NU: Northwestern University)H-Index: 9
view all 5 authors...
A few investigators have described the movement of the center of pressure (COP) of the ground reaction force and the activation patterns of the lower limb muscles during gait initiation and termination. This study examines the effective rocker (roll-over shape) behavior of the knee-ankle-foot (KAF) system during gait initiation, steady-state walking (i.e. constant speed gait), and gait termination. The KAF roll-over shapes were characterized by transforming COP data of 10 able-bodied subjects fr...
15 CitationsSource
#1Steven A. GardH-Index: 23
#2Dudley S. ChildressH-Index: 25
Last.Andrew H. HansenH-Index: 22
view all 3 authors...
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