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Updated: Jun 16, 2026
Clinical-oriented Three-dimensional Gait Analysis Method for Evaluating Gait Disorder
Published on: March 4, 2018
How crouch gait can dynamically induce stiff-knee gait
Marjolein M van der Krogt1, Daan J J Bregman, Martijn Wisse
1Department of Rehabilitation Medicine, Research Institute MOVE, VU University Medical Center, PO Box 7057, 1007 MB Amsterdam, The Netherlands. mmvanderkrogt@gmail.com
Insights
Children with cerebral palsy often exhibit stiff-knee gait due to crouch posture. Our model shows reduced swing knee flexion results from passive dynamics, not just muscle control.
Area of Science:
- Biomechanics
- Gait Analysis
- Pediatric Rehabilitation
Background:
- Children with cerebral palsy (CP) often have stiff-knee gait, characterized by insufficient knee flexion during the swing phase of walking.
- This gait abnormality can lead to foot dragging and tripping, impacting mobility and increasing fall risk.
- While muscle overactivity is often implicated, the role of passive limb dynamics in stiff-knee gait is less understood.
Purpose of the Study:
- To investigate the influence of stance knee flexion (crouch posture) on swing knee flexion using a forward-dynamic simulation model.
- To determine if passive dynamics alone can explain the reduced swing knee flexion observed in stiff-knee gait.
Main Methods:
- Development of a forward-dynamic computational model of human walking.
- Inclusion of a passive swing knee mechanism capable of stable cyclic locomotion.
- Systematic variation of the stance knee crouch angle to observe its effect on swing knee flexion.
Main Results:
- Increased stance knee crouch angle led to significantly reduced swing knee flexion, mimicking stiff-knee gait.
- Reduced swing knee flexion was primarily attributed to altered gravitational moments acting on the knee joint during the swing phase.
- While increased push-off strength and hip flexion torque improved swing knee flexion, the effect of stance crouch angle was more dominant.
Conclusions:
- Decreased swing knee flexion in children with CP can arise dynamically from a crouched stance posture.
- Passive joint mechanics play a crucial role in the manifestation of stiff-knee gait.
- These findings suggest that interventions targeting stance posture may be beneficial for improving swing knee motion in CP.
Abstract:
Children with cerebral palsy frequently experience foot dragging and tripping during walking due to a lack of adequate knee flexion in swing (stiff-knee gait). Stiff-knee gait is often accompanied by an overly flexed knee during stance (crouch gait). Studies on stiff-knee gait have mostly focused on excessive knee muscle activity during (pre)swing, but the passive dynamics of the limbs may also have an important effect. To examine the effects of a crouched posture on swing knee flexion, we developed a forward-dynamic model of human walking with a passive swing knee, capable of stable cyclic walking for a range of stance knee crouch angles. As crouch angle during stance was increased, the knee naturally flexed much less during swing, resulting in a 'stiff-knee' gait pattern and reduced foot clearance. Reduced swing knee flexion was primarily due to altered gravitational moments around the joints during initial swing. We also considered the effects of increased push-off strength and swing hip flexion torque, which both increased swing knee flexion, but the effect of crouch angle was dominant. These findings demonstrate that decreased knee flexion during swing can occur purely as the dynamical result of crouch, rather than from altered muscle function or pathoneurological control alone.
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