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Related Experiment Videos

Spastic paretic stiff-legged gait: joint kinetics.

D C Kerrigan1, M E Karvosky, P O Riley

  • 1Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, Massachusetts 02114, USA.

American Journal of Physical Medicine & Rehabilitation
|March 30, 2001
PubMed
Summary

Individuals with spastic paretic stiff-legged gait exhibit altered hip and ankle joint kinetics, not just knee impairments. This suggests multiple underlying mechanisms contribute to this gait pattern.

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Area of Science:

  • Biomechanics
  • Neurology
  • Gait Analysis

Background:

  • Spastic paretic stiff-legged gait, characterized by reduced knee flexion during swing, is often linked to upper-motor neuron injury.
  • Previous research suggested multiple factors beyond spastic quadriceps activity contribute to this gait abnormality.

Purpose of the Study:

  • To investigate whether subjects with spastic paretic stiff-legged gait demonstrate altered joint kinetics at the hip and ankle, in addition to the knee.
  • To explore the underlying biomechanical mechanisms contributing to reduced knee flexion in swing.

Main Methods:

  • A comparative study involving 20 subjects diagnosed with stroke-induced spastic paretic stiff-legged gait.
  • Kinetic data from the hip, knee, and ankle joints were collected and compared against 20 able-bodied control subjects.

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Main Results:

  • Significant reductions in peak knee-joint power absorption and peak ankle-joint power generation were observed in the patient group.
  • Increased peak external hip flexion torque, hip-power generation during loading response, knee-extension torque in midstance, ankle-dorsiflexion torque, and ankle-power absorption in stance were noted.
  • Substantial inter-subject variability in torque and power values was found, exceeding that of the control group.

Conclusions:

  • The findings support the hypothesis of multiple mechanisms contributing to reduced knee flexion in swing, beyond isolated knee impairments.
  • Observed joint kinetic differences may represent compensations for or be associated with the reduced knee flexion.
  • Significant individual variability suggests unique biomechanical strategies underlie the spastic paretic stiff-legged gait pattern in different individuals.