Amputee Independent Prosthesis Properties—A new model for description and measurement

Major, Matthew J.; Twiste, Martin; Kenney, Laurence; Howard, David

doi:10.1016/j.jbiomech.2011.07.016

Cited by 38 publications

(40 citation statements)

References 26 publications

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“…The vertical load of the model was 1.5 times the person's weight (900 N). The lateral load was defined as 23% of the body weight that is 207 N [7]. The auxiliary torque was calculated at 15750 Nmm for a 900 N vertical load.…”

Section: Fea Design and Fea Testingmentioning

confidence: 99%

Design and Analysis of 3D Printable Foot Prosthesis

Rochlitz

Pammer

2017

Period. Polytech. Mech. Eng.

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Section: Fea Design and Fea Testingmentioning

confidence: 99%

Design and Analysis of 3D Printable Foot Prosthesis

Rochlitz

Pammer

2017

Period. Polytech. Mech. Eng.

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“…Changing prosthetic components and alignment alters prosthesis mechanical properties in a complex and interactive manner [41]. Consequently, this study avoided the use of commercial prostheses to systematically test a range of ankle stiffness without simultaneously altering other properties.…”

Section: Custom Foot-ankle Mechanismmentioning

confidence: 99%

The effects of prosthetic ankle stiffness on stability of gait in people with transtibial amputation

et al. 2016

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Abstract-The ability to control balance during walking is a critical precondition for minimizing fall risk, but this ability is compromised in persons with lower-limb absence because of reduced sensory feedback mechanisms and inability to actively modulate prosthesis mechanical function. Consequently, these individuals are at increased fall risk compared with nondisabled individuals. A number of gait parameters, including symmetry and temporal variability in step/stride characteristics, have been used as estimates of gait stability and fall risk. This study investigated the effect of prosthetic ankle rotational stiffness on gait parameters related to walking stability of transtibial prosthesis users. Five men walked with an experimental prosthesis that allowed for independent modulation of plantar flexion and dorsiflexion stiffness. Two levels of plantar flexion and dorsiflexion stiffness were tested during level, uphill, and downhill walking. The results demonstrate that low plantar flexion stiffness reduced time to foot-flat, which was associated with increased perceived stability, while low dorsiflexion stiffness demonstrated trends in temporal-spatial parameters that are associated with improved gait stability (reduced variability and asymmetry). Prosthesis design and prescription for low rotational stiffness may enhance gait safety for transtibial prosthesis users at risk of unsteadiness and falls.

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“…In the simple case of a cantilever beam with a point load, the equation for the deflection at the point where the load is applied is (2) where δ is the deflection at that point, F is the load applied perpendicular to the beam, and L is the distance from the supported end of the beam to the application point of the load. The strain energy stored in a cantilever beam in bending is given by Eqn.…”

Section: Unconstrained Cantilever Beam Modelmentioning

confidence: 99%

“…Several studies have proposed a variety of mechanical, or "amputee-independent", metrics of prosthetic feet that can be used either to predict the performance of a foot or to draw comparisons between different feet to aid in prescribing the best foot for a particular patient [2][3][4][5]. The most widely used of these is the categories defined by the American Orthotics and Prosthetics Association (AOPA), which group feet based on a series of mechanical tests.…”

Section: Introductionmentioning

confidence: 99%