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Related Concept Videos

Ankle Joint01:10

Ankle Joint

2.4K
The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...
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Multi-Directional Ankle Impedance During Standing Postures.

Guilherme A Ribeiro, Lauren N Knop, Mo Rastgaar

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    |August 22, 2020
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    Summary
    This summary is machine-generated.

    Ankle mechanical impedance, including stiffness and damping, changes with posture and torque during standing. These findings aid in designing less strenuous biomechanics tests for individuals with mobility impairments.

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    Area of Science:

    • Biomechanics
    • Human Motor Control

    Background:

    • Ankle mechanical impedance is crucial for balance and locomotion.
    • Understanding impedance variations during static postures informs dynamic movement analysis.

    Purpose of the Study:

    • To quantify multi-directional ankle mechanical impedance (stiffness, damping, inertia) in two degrees-of-freedom (DOF) during standing.
    • To investigate how these properties vary with ankle angle, torque, and body posture.

    Main Methods:

    • Fifteen subjects stood in four postures simulating gait phases on a vibrating platform.
    • Pulse train perturbations were applied in sagittal and frontal planes to measure ankle impedance.

    Main Results:

    • Ankle stiffness and damping generally increased with forward center of pressure (COP) movement and plantarflexion torque.
    • Multi-directional ankle impedance during standing shared similarities in shape and tilt axes with unloaded conditions, but differed in amplitude.
    • Standing ankle stiffness amplitude was comparable to values during dynamic walking.

    Conclusions:

    • Ankle impedance characteristics during standing are influenced by posture and torque.
    • Results suggest that static standing tests can provide valuable insights into dynamic ankle behavior.
    • Findings support the development of adapted biomechanics experiments for individuals with physical limitations.