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Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
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Post-stroke Stiff-Knee gait: are there different types or different severity levels?

Jeonghwan Lee1, Bryant A Seamon2, Robert K Lee3

  • 1Walker Department of Mechanical Engineering, University of Texas at Austin, 204 E Dean Keeton St, Austin, TX, 78712, USA.

Journal of Neuroengineering and Rehabilitation
|February 26, 2025
PubMed
Summary

Stiff-Knee gait (SKG) in stroke survivors may not have distinct subtypes based on motor control. Differences observed in gait patterns are likely due to varying severity of impairment rather than different SKG types.

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Area of Science:

  • Biomechanics
  • Neurorehabilitation
  • Gait Analysis

Background:

  • Stiff-Knee gait (SKG), characterized by reduced knee flexion during swing, is common after stroke.
  • The underlying causes and potential subtypes of SKG remain debated, impacting intervention effectiveness.

Purpose of the Study:

  • To investigate potential subtypes of Stiff-Knee gait (SKG) in stroke survivors based on motor control complexity.
  • To differentiate SKG based on kinematic and kinetic compensatory strategies during walking.

Main Methods:

  • Retrospective analysis of kinematic, kinetic, and muscle activity data from 50 stroke survivors and 15 controls.
  • Time-series kernel k-means cluster analysis applied to frontal plane kinematics to identify gait patterns.
  • Non-negative matrix factorization used to assess underlying motor control differences.

Main Results:

  • Three clusters (A, B, C) were identified based on compensatory frontal plane kinematics, gait speed, and propulsion asymmetry.
  • Clusters A and B, characterized by hip hiking and varying degrees of knee flexion and gait speed, represented the majority of clinician-diagnosed SKG.
  • No fundamental differences in underlying motor control were found between clusters despite kinematic and kinetic variations.

Conclusions:

  • The identified clusters likely represent different severities of gait impairment in stroke survivors rather than distinct subtypes of Stiff-Knee gait.
  • Gait speed and propulsion asymmetry appear to be key indicators differentiating these gait patterns.
  • Further research is needed to refine understanding and optimize clinical interventions for SKG post-stroke.