Addendum to Episode 14 in the SHIFT project - The FPI
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Addendum to Episode 14 in the SHIFT project - The FPI
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This Voodoo Biomechanics vignette touches on the limitations of the Foot Posture Index (FPI) when used to infer mechanical function, arguing that it is widely misinterpreted in clinical practice. The FPI is a static, descriptive tool that measures foot shape during relaxed standing, classifying feet as pronated, neutral, or supinated. However, functional stiffness, which is the foot's resistance to deformation, is a dynamic mechanical property that only emerges under load and during gait. Consequently, the FPI cannot define functional stiffness or predict dynamic mechanical behavior because static posture is a poor predictor of kinetics. The FPI remains useful for communication and documentation but should not be used as a functional classifier, particularly as biomechanics shifts toward kinetic explanations of foot behavior.