During the swing phase of gait, why does tibialis anterior activation primarily cause ankle dorsiflexion, rather than foot inversion, given its anatomical position?

💡 Explanation

Tibialis anterior contraction causes ankle dorsiflexion more than foot inversion because the axis of rotation at the subtalar joint reduces the inversion moment. The joint's biomechanics limit inversion. Therefore, dorsiflexion dominates, rather than inversion, due to the joint's alignment relative to the muscle's force vector.

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