Using a three-dimensional model of the Ankle–Foot Orthosis/leg to explore the effects of combinations of axis misalignments

Fatone, Stefania; Johnson, W. Brett; Kwak, Samuel T.

doi:10.1177/0309364614556839

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…This finding has also been observed in articulated external fixations of the ankle (Bottlang et al, 1999). In addition, research has shown that misalignment of articulated AFOs with the ankle joint can lead to increases in cuff movement (Fatone and Hansen, 2007;Fatone et al, 2014), which may cause patient discomfort by generating skin and underlying tissue irritation on the shank.…”

Section: Introductionmentioning

confidence: 55%

The influence of passive-dynamic ankle-foot orthosis bending axis location on gait performance in individuals with lower-limb impairments

Ranz

Esposito

Wilken

et al. 2016

Clinical Biomechanics

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Section: Introductionmentioning

confidence: 55%

The influence of passive-dynamic ankle-foot orthosis bending axis location on gait performance in individuals with lower-limb impairments

Ranz

Esposito

Wilken

et al. 2016

Clinical Biomechanics

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“…The stiffness of the footplate with each of the spacers was evaluated with BRUCE [26]. The height of ADJUST's mechanical hinges could be changed to enable alignment to the anatomical axis of the ankle [37] (Fig. 6i).…”

Section: Appendix Parts Of Adjustmentioning

confidence: 99%

Development of an Ankle-Foot Orthosis That Provides Support for Flaccid Paretic Plantarflexor and Dorsiflexor Muscles

Wilk¹,

Reints

Postema

et al. 2018

IEEE Trans. Neural Syst. Rehabil. Eng.

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ADJUST, a novel ankle-foot orthosis (AFO) that we have developed, allows the ankle a normal range of motion (ROM) while providing support for flaccid ankle-muscle paresis. It consists of two leaf-spring hinges that independently control plantarflexion and dorsiflexion stiffness. To evaluate whether ADJUST meets the minimum mechanical requirements, we quantified its ankle ROM and stiffness. To evaluate whether it meets the minimum ankle kinematic and kinetic goals for normal gait, a patient with both plantarflexor and dorsiflexor paralysis used it, and his own AFO, to walk. When fitted with stiff springs, ADJUST met all requirements and goals. During the stance and the swing phases, ankle ROM was within the normal range when ADJUST was fitted with stiff springs. Ankle ROM during stance was outside the normal range both with the patient's own AFO and with ADJUST when it was fitted with flexible springs. Power at the ankle met the minimum goal but was lower with ADJUST than with the patient's own AFO. The optimal stiffness configuration that would result in a higher power at the ankle with a normal ankle ROM was not reached for this patient. Walking with ADJUST seems feasible and could be profitable in patients with flaccid ankle muscle paresis.

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“…12 In this sense, an ideal AFO should be equipped with multiple degrees of freedom (DOFs), and adjustable axial orientations of mechanical joints for the misalignment between axes of the mechanical and anatomical joints may lead to tissue damage and reduced gait efficiency. 13 There are design works on AFOs with multiple DOFs. 6,14,15 However, few of them are equipped with mechanical joints whose axial orientations can be adjusted to align with those of anatomical joints.…”

Section: Introductionmentioning

confidence: 99%

Design of a portable ankle robot with reductive-burden layout and self-adjustable posture

Zhou

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this paper, a portable ankle robot with the design consideration of reducing the burden exerted on wearers and self-adjustable posture is presented. Firstly, by deriving the burden, namely the extra energy consumption of the wearer caused by the inertia of an ankle foot orthosis (AFO), the ideal position of the AFO’s gravity centre that reduces the burden is investigated. Secondly, according to the ideal location, the structural layout of the ankle robot is determined, and its detailed configuration is introduced. Following that, based on a 2-degree-of-freedom (DOF) foot model, the robot-human system is set up and analysed. On one aspect, the mechanism of self-adjustment of the device’s posture is illustrated. On the other aspect, the torque assistance of the device is verified by the kinetic analysis of the system. Finally, a portable robotic control system is set up and tested on a healthy subject. Results indicated the effectiveness of the system in generating adaptive reference joint trajectories and making the subject well track them.

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Using a three-dimensional model of the Ankle–Foot Orthosis/leg to explore the effects of combinations of axis misalignments

Abstract: Misalignments in the transverse plane had a dominating effect on relative motion between the Ankle-Foot Orthosis and leg emphasizing the importance of including the third dimension in the model and prioritizing accuracy of alignment in the transverse plane.

Cited by 7 publications

References 6 publications

The influence of passive-dynamic ankle-foot orthosis bending axis location on gait performance in individuals with lower-limb impairments

The influence of passive-dynamic ankle-foot orthosis bending axis location on gait performance in individuals with lower-limb impairments

Development of an Ankle-Foot Orthosis That Provides Support for Flaccid Paretic Plantarflexor and Dorsiflexor Muscles

Design of a portable ankle robot with reductive-burden layout and self-adjustable posture

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