Muscular coordination of knee motion during the terminal-swing phase of normal gait.

@article{Arnold2007MuscularCO,
  title={Muscular coordination of knee motion during the terminal-swing phase of normal gait.},
  author={Allison S. Arnold and Darryl G. Thelen and Michael H. Schwartz and F. Clayton Anderson and Scott L. Delp},
  journal={Journal of biomechanics},
  year={2007},
  volume={40 15},
  pages={
          3314-24
        }
}
Children with cerebral palsy often walk with diminished knee extension during the terminal-swing phase, resulting in a troublesome "crouched" posture at initial contact and a shortened stride. Treatment of this gait abnormality is challenging because the factors that extend the knee during normal walking are not well understood, and because the potential of individual muscles to limit terminal-swing knee extension is unknown. This study analyzed a series of three-dimensional, muscle-driven… Expand
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Electrical Stimulation of the Rectus Femoris During Pre-swing Diminishes Hip and Knee Flexion During the Swing Phase of Normal Gait
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It is concluded that excess RF activity during pre-swing has the potential to contribute to stiff-knee gait, and that clinical treatment should consider the “counter-intuitive” function that the RF has in extending the hip. Expand
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References

SHOWING 1-10 OF 46 REFERENCES
The influence of muscles on knee flexion during the swing phase of gait.
TLDR
It is confirmed that reduced knee flexion during the swing phase (stiff-knee gait) may be caused by overactivity of the rectus femoris, and suggested that weakened hip flexors and stance phase factors that determine the angular velocities of the knee and hip at toe-off may be responsible for decreased kneeflexion during swing phase. Expand
Contributions of muscle forces and toe-off kinematics to peak knee flexion during the swing phase of normal gait: an induced position analysis.
TLDR
This study provides a basis for analyzing stiff-knee gait, a movement abnormality in which kneeflexion in swing is diminished, and makes clear the importance of knee flexion velocity at toe-off relative to the effects of muscle forces exerted after toe-offs in generating peak knee flexions. Expand
The modelling of adult spastic paretic stiff-legged gait swing period based on actual kinematic data.
TLDR
The feasibility of forward dynamic modelling based on actual clinical data is demonstrated and provides a further means to analyze potential mechanisms of this gait disability. Expand
Muscles that support the body also modulate forward progression during walking.
TLDR
It is suggested that a relatively small group of muscles provides most of the forward progression and support needed for normal walking, and that walking dynamics are influenced by non-sagittal muscles, such as the gluteus medius, even though walking is primarily a sagittal-plane task. Expand
Biomechanics and muscle coordination of human walking. Part I: introduction to concepts, power transfer, dynamics and simulations.
TLDR
This work elucidate how energy produced by muscles is delivered to the crank through the synergistic action of other non-energy producing muscles; specifically, that a major function performed by a muscle arises from the instantaneous segmental accelerations and redistribution of segmental energy throughout the body caused by its force generation. Expand
Dynamic optimization of human walking.
TLDR
The simulation results suggest that minimum metabolic energy per unit distance traveled is a valid measure of walking performance. Expand
Common gait abnormalities of the knee in cerebral palsy.
TLDR
Based on the experience gained from performing gait analysis on more than 588 patients with cerebral palsy, four primary gait abnormalities of the knee have been identified: jump knee, crouch knee, stiff knee, and recurvatum knee. Expand
Analysis and synthesis of human swing leg motion during gait and its clinical applications.
TLDR
A mathematical representation of the human leg during the swing phase of gait was developed that employed variables which were known to be clinically significant physical, anatomical and physiological features influencing the gait pattern. Expand
Individual muscle contributions to support in normal walking.
TLDR
The results showed that, in early stance, before the foot was placed flat on the ground, support was provided mainly by the ankle dorsiflexors, and that resistance of the skeleton to the force of gravity is no larger than 1/2 body weight throughout the gait cycle. Expand
Spasticity and `Spastic' Gait in Children with Cerebral palsy
  • P. Crenna
  • Medicine
  • Neuroscience & Biobehavioral Reviews
  • 1998
TLDR
Application to the analysis of overground walking in children with spastic cerebral palsy (CP) revealed that, for representative lower limb muscles, the relationship between EMG levels and estimated muscle lengthening rate displays either increased gain or reduced velocity threshold. Expand
...
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4
5
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