The most common pathomechanical problem associated with pes planus is compensatory pronation. Overpronation and pes planus are key factors in preventing the subtalar joint from locking during the complex biomechanical functioning of the lower extremity. This failure of the subtalar joint to lock creates a hypermobile foot, setting the stage for structural deformities and problems throughout the lower limb.
Further reading on both pes cavus and pes planus, their associated compensations and treatment.
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