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Joint stabilising response to lateral and medial tilts
Gaspar Morey-Klapsing1, Adamantios Arampatzis, Gert Peter Brüggemann
1Institute for Biomechanics and Orthopaedics, German Sport University Cologne, Carl-Diem-Weg, 6, D-50933 Cologne, Germany. morey@dshs-koeln.de
Clinical Biomechanics (Bristol, Avon)
|April 20, 2005
Summary
Passive joint structures effectively stabilize the ankle during medial tilts, reducing the need for muscle activation. This study analyzed kinematic, kinetic, and electromyographic (EMG) data during sudden foot tilts.
Area of Science:
- Biomechanics
- Human Movement Science
- Orthopedics
Background:
- Traditional joint stabilization studies often compare groups or focus on single parameters, limiting comprehensive understanding.
- This research addresses limitations by examining multiple parameters during dynamic joint stabilization tasks.
Purpose of the Study:
- To investigate the dynamic response of the human foot and ankle during sudden inversion and eversion (medial and lateral tilts).
- To compare kinematic, kinetic, and electromyographic (EMG) parameters between medial and lateral foot tilts during single-leg stance.
Main Methods:
- 24 healthy subjects performed sudden lateral and medial foot tilts on one leg.
- A 3D foot model analyzed ankle and foot motion.
- Electromyography (EMG) of six lower limb muscles and ground reaction forces were recorded.
Main Results:
- Forefoot-rearfoot motion exceeded ankle motion in speed and magnitude.
- Medial tilts exhibited lower motion and angular velocity but higher ground reaction force integrals compared to lateral tilts.
- EMG patterns were similar, but specific muscle activation differences were observed.
Conclusions:
- Passive structures appear to counteract destabilizing forces during medial tilts, reducing muscular effort.
- This suggests a significant role for passive tissues in ankle joint stabilization, minimizing reliance on active muscle responses.