In which situation would immobilization be important?

Immobilization is crucial in situations where serious injuries have occurred because it helps to stabilize the injured area, preventing further damage and facilitating the healing process. When a part of the body is immobilized, it allows the healing tissues—such as ligaments, muscles, and bones—to recover without movement that might exacerbate the injury. This is particularly important with fractures, sprains, or significant soft tissue injuries, where movement can lead to complications, prolonged recovery time, and potential chronic issues.

In contrast, enhancing mobility, as suggested in one of the other options, would be counterproductive in the context of serious injuries. Minor bruising does not typically require immobilization, as it generally heals well with minimal intervention. Additionally, when an athlete is not in pain, this does not imply the absence of an injury that requires immobilization; significant injuries can still exist without immediate pain. Therefore, in cases involving serious injuries, immobilization serves as a protective mechanism to promote healing and restore function effectively.