Comparison of transtibial amputee and non-amputee biomechanics during a common turning task

Segal, Ava D.; Orendurff, Michael S.; Czerniecki, Joseph M.; Schoen, Jason A.; Klute, Glenn K.

doi:10.1016/j.gaitpost.2010.09.021

Cited by 48 publications

(38 citation statements)

References 20 publications

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“…A rotating reference frame was defined with the origin at the center-of-mass, the x-axis through the center of the 1 m radius circular path and the y-axis (forward progression) perpendicular to the x-axis and tangent to the circle which the subjects were following [14]. Positive radial GRFs (x-axis) were defined in the direction of the circle center.…”

Section: Discussionmentioning

confidence: 99%

“…Segal et al [14] compared the transverse plane joint moments and radial GRIs between amputees and non-amputees while walking along a 1 m radius circular path at the same speed. They found that amputees had decreased internal rotation moments at the residual leg hip Turning plays a prominent role in daily living activities and requires the modulation of the ground reaction forces to accelerate the body's center-of-mass along the path of the turn.…”

Section: Introductionmentioning

confidence: 99%

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Compensatory mechanisms of transtibial amputees during circular turning

et al. 2011

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compensatory mechanisms of transtibial amputees during circular turning

et al. 2011

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“…Turning is a common yet complex manoeuvre that occurs whilst in transit and from standing and there is a growing body of research in this area for healthy and pathological gait [1,2]. Current research on the standing turn has adopted differing approaches to quantifying and describing the turning motion [3,4].…”

Section: Introductionmentioning

confidence: 99%

Defining instances and limbs during performance of the standing turn

Smith

Strike

2017

Gait & Posture

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Conventions have been reported to describe walking and turning gait. No such descriptions appear for the 180° standing turn and as such there are inconsistencies in the literature reporting on this movement. The complexity of explaining the standing turning motion, variation in number of steps when turning, and differing strategies used means conventions will make research reporting easier to comprehend and less likely for errors in interpretation. We propose definitions of the 180° standing turning motion and steps used to complete a turn for able-bodied and pathological populations to encourage consistency in reporting. It is recommended that the definitions be applied in future research on standing turns.

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“…However, studies of four representative daily activities show that turning steps may account for an average of 25 percent of steps, ranging from 8 to 50 percent of all steps depending on the activity [12], which people with amputation accomplish using different control strategies than nondisabled people. While a nondisabled person relies on hip movement in the coronal plane and moments generated at the ankle, a person with amputation using a passive prosthesis relies on hip extension in the sagittal plane [13][14][15][16]. During a turn, modulation of ankle impedance in the sagittal and frontal planes plays a major role in controlling lateral and propulsive ground reaction forces in order to accelerate the body's center of mass along the gait path; thus, during a turning step, lateral and propulsive impulses are larger than during a straight step [17].…”

Section: Introductionmentioning

confidence: 99%

Ankle mechanics during sidestep cutting implicates need for 2-degrees of freedom powered ankle-foot prostheses

2015

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Abstract-The ankle joint of currently available powered prostheses is capable of controlling one degree of freedom (DOF), focusing on improved mobility in the sagittal plane. To increase agility, the requirements of turning in prosthesis design need to be considered. Ankle kinematics and kinetics were studied during sidestep cutting and straight walking. There were no significant differences between the ankle sagittal plane mechanics when comparing sidestep cutting and straight walking; however, significant differences were observed in ankle frontal plane mechanics. During straight walking, the inversion-eversion (IE) angles were smaller than with sidestep cutting. The ankle that initiated the sidestep cutting showed progressively increasing inversion from 2 to 13 degrees while the following contralateral step showed progressively decreasing inversion from 8 to 4 degrees during normal walking speed. The changes in IE kinematics were the most significant during sidestep cutting compared with straight walking. The IE moments of the step that initiated the sidestep cutting were always in eversion, acting as a braking moment opposing the inverting motion. This suggests that an ankle-foot prosthesis with active DOFs in the sagittal and frontal planes will increase the agility of gait for patients with limb loss.

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Comparison of transtibial amputee and non-amputee biomechanics during a common turning task

Cited by 48 publications

References 20 publications

Compensatory mechanisms of transtibial amputees during circular turning

Compensatory mechanisms of transtibial amputees during circular turning

Defining instances and limbs during performance of the standing turn

Ankle mechanics during sidestep cutting implicates need for 2-degrees of freedom powered ankle-foot prostheses

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