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عمومی::
برجستگی استخوان نشیمن گاهی (ایسکیوم)
Body weight resting on bony prominences, such as the scapula, sacrum, greater trochant- ers, ischial tuberosities, and heels, can cause significant concentrations of pressure at the skin's surface and in the underlying soft tissue.
For example, when a per- son is sitting on a relatively hard cushion, a disproportionately large portion of his or her body weight is born by the tissue beneath the ischial tuberosities.
On a softer surface, the ischial tuberosities and buttocks may immerse more deeply, even to the level of the greater trochanters.
If the seat cush- ion is 1.5" (3.8 cm) in depth and the vertical distance between the ischial tuberosities and greater trochanters is 2" (5 cm), the potential for immersion isn't enough to significantly unload the ischial tuberosities.
A forward lean can unweight the ischial tuberosities.
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