But when we’re confined to bed because of
illness or an injury, or under anesthesia for
an operation, we may move very little, if at
all. As a result, pressure builds up on specific
areas of the body, particularly those where
the bones are prominent—for example, the
lower part of your back near the buttocks
and your heels if you’re lying on your back
or, if you’re on your side, your hip and ankle.
When we do move, or are moved incorrectly,
friction may add to the problem of pressure.