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How toe-out foot positioning influences body-dynamics during a sit-to-stand task
Katia Turcot1, Bianca Lachance2
1Faculty of Medicine, Department of kinesiology, Laval University, Quebec, Canada; Centre for Interdisciplinary Research in Rehabilitation and Social Integration (CIRRIS), Quebec, Canada.
Gait & Posture
|March 18, 2019
Summary
Toe-out foot positioning alters body mechanics during sit-to-stand (STS) movements. Increased toe-out angles significantly affect movement time, force distribution, and knee moments, suggesting altered biomechanical strategies.
Area of Science:
- Biomechanics
- Human Movement Science
- Orthopedics
Background:
- Toe-out foot positioning is a compensatory strategy for pain and joint constraints in degenerative joint disease during gait.
- Its effects on functional tasks like sit-to-stand (STS) remain uninvestigated.
Purpose of the Study:
- To investigate how unilateral and bilateral toe-out foot positioning influence body dynamics during STS tasks.
- To analyze changes in execution time, trunk kinematics, ground reaction force, and joint moments.
Main Methods:
- Fifteen healthy participants performed STS under seven foot positioning conditions (neutral, unilateral toe-out 10-30°, bilateral toe-out 10-30°).
- Key parameters analyzed included execution time, trunk kinematics, vertical ground reaction force ratio, and maximal hip and knee joint moments.
Main Results:
- Significant differences were observed across conditions for STS execution time, vertical force ratio, and maximal knee flexion moment.
- Pronounced unilateral toe-out positioning significantly impacted force ratio and knee flexion moment.
Conclusions:
- Toe-out foot positioning influences body dynamics during STS, supporting its role in altering biomechanical strategies.
- Findings may inform patient management strategies aimed at reducing secondary joint diseases like osteoarthritis.
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