Which of the following is an example of a chronic injury?

Chronic injuries are characterized by long-term conditions that develop over time, often as a result of repetitive stress or overuse. In this context, tendinitis from repetitive motion is a prime example of a chronic injury because it results from repeated strains on a tendon, leading to inflammation and pain that persist over a prolonged period. This type of injury typically does not have a specific acute onset but instead builds up gradually through continuous activity or poor mechanics.

In contrast, a sprained ankle and a torn ACL are examples of acute injuries, which occur suddenly due to a specific incident or trauma. A fractured bone from a fall also exemplifies an acute injury, occurring immediately as a result of an accident or impact. Therefore, the nature of tendinitis as a consequence of repetitive actions distinguishes it as a chronic injury, fitting the definition most accurately among the provided choices.