What type of injury results from a specific event or accident?

Acute injuries are defined as injuries that occur suddenly due to a specific event or accident, such as a fall, collision, or an unexpected movement. This type of injury often results in immediate pain, swelling, and, in some cases, loss of function in the affected area. Examples include fractures, sprains, or contusions that happen as a direct reaction to a particular incident.

Chronic injuries, on the other hand, develop gradually over time, often due to repetitive stress or overuse, rather than a single event. Environmental injuries are those caused by external factors like weather conditions and are not linked to an immediate physical incident. Muscle strains can be either acute or chronic depending on how they occur, but in this context, they do not refer specifically to injuries resulting from a single event. Thus, acute injuries most accurately describe the situation outlined in the question.