Flat foot (pes planus) is a condition where the medial longitudinal arch of the foot is reduced or absent, causing the sole to make full or near-full contact with the ground. It can be flexible (arch appears when non-weight-bearing) or rigid, and may be congenital or acquired.

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Now let me read the Campbell's section for a more detailed clinical picture and the flat foot flexibility section:

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Excellent content. Let me get more on diagnosis, staging, and treatment from Miller's and Bailey's:

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