The SHIFT Project 14 - Pronated = Flexible, Supinated = Rigid . Think again!
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The SHIFT Project 14 - Pronated = Flexible, Supinated = Rigid . Think again!
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This podcast presents a conceptual synthesis and narrative review that challenges the deeply ingrained principle in podiatric biomechanics equating foot pronation with flexibility and supination with rigidity. It argues that functional stiffness should be redefined as a load-dependent kinetic state that emerges dynamically during gait, rather than a fixed mechanical property inferred from kinematic posture. Drawing on advanced multi-segment foot models and engineering principles, the presenters assert that a foot's resistance to deformation is task- and phase-dependent, meaning a foot can be visibly pronated yet mechanically stiff, or supinated yet compliant. Ultimately, the review advocates for a shift in clinical reasoning from geometry-based interpretations toward load-based interpretations of foot function, which better explains clinical observations and the variable success of orthotic interventions.