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Cumulative volumetric exposures to effective stresses in different parts of the buttocks under combined compression and shear loading. (A) Models of the buttock under pressure and coated dressing. (B) On the skin surface near the perimeter of the pressure ulcer. (C) On the skin surface near the border of the dressing. (D) On the skin surface near the tip of the coccyx. Reproduced with permission from Schwartz and Gefen (2019).
