welcome to hcm
when the dependant areas remain compressed due to inability to change position ourselves. lack of circulation there results in damage to skin in that area and gradually the lesion gets depper if not controlled.
to prevent most important thing is to change position of the patient every 2-3 hours. he should not be lying with pressure on any area for more than 2-3 hours.
keep the skin there dry. if the patient passes urine in bed immedialtely clean it. do not let him lie in wet bed for long.whatever bed sores are formed do regular dressings as advised by surgeon.
keeping the diet healthy forms an important part of healing of the bed sores.
also get the blood sugars under control to allow rapid healing.
use of air mattreses also help in shifting pressure from different dependant areas. your doctor will tell you about them in detail.
hope this is helpful