Where do pressure ulcers commonly occur?

Pressure ulcers, also known as bedsores or decubitus ulcers, most commonly occur at bony prominences due to the sustained pressure that leads to tissue ischemia and necrosis. Areas such as the heels, sacrum, elbows, and joints are particularly vulnerable, as the overlying skin is thin and there is less cushioning from adipose tissue. Prolonged pressure can obstruct blood flow, leading to breakdown of the skin and underlying tissues.

This type of ulceration is primarily associated with immobility, where individuals are unable to frequently change positions, resulting in increased pressure on these specific areas. Therefore, the statement about bony prominences accurately reflects the anatomical locations that are most affected by pressure ulcers, which are surrounded by soft tissue that can be compromised under prolonged pressure.

The other options either reference incorrect anatomical locations, such as muscular areas, or suggest inaccuracies regarding the circumstances leading to pressure ulcers. For instance, pressure ulcers are not exclusive to the coccyx and heels nor can they develop from short-term pressure, which is less likely to cause prolonged damage.