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Introduction
0% · Heel strike
Tibialis posterior (deep, dashed)Dorsiflexors (sagittal)
Tibialis posterior and fibularis group; schematic activation
+ Increasing activity− Not plotted
Schematic relative amplitude; not measured values.
Gait cycle: 0%
Heel strike
Graph explanations and references
— Tibialis posterior — Fibularis longus & brevis
Overall muscle activity timing, not separately measured transverse-plane activity; heights are not EMG.
Net joint torque — small net abduction across stance. Combined effect at the joint; it does not identify one muscle. No published torque curve is available for this lesson, so none is drawn.
Pronation and supination combine three planes; the top view isolates their transverse components.
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Chapters
Learning objectives
Relate tibialis posterior and fibularis activity to the transverse components of pronation and supination, and lower-leg rotation over a supported foot.