Answer and explanation:
When we talk about pressury injures, we're referring to a certain body area in which there's damaged tissue due to soft tissue being pressed against a bony surface.
There are various ways in which these kind of injuries can be prevented. For example, checking the damaged every certain period of time so there's no infection risks and also changing positions (as it's stated in the question) so any sort of excess friction can be avoided. Also, keeping the skin moisturized and hydrated could be helpful.