What are the predisposing factors to developing pressure sores?

Protein, immobile: Pressure sores or "bedsores" are most commonly the result of three different conditions. Most common is immobility for extended periods of time. The pressure on the skin cuts its blood supply and this results in skin breakdown. Second, low blood protein may additionally cause the skin to break down prematurely. Last, urine and feces on the unclean skin, yields skin breakdown.

#1=immobility: But there are many other factors such as nutrition, contractures, fractures, spasm, paraplegia, sensory disturbances, obesity, incontinence, inability to care for oneself and many, many more.