How can you identify a sprained ankle?

Identifying a sprained ankle is primarily based on observing specific signs and symptoms, with swelling and bruising being key indicators. When an ankle is sprained, the ligaments that support the joint are stretched or torn, which typically leads to localized swelling due to inflammation. Bruising occurs as a result of bleeding under the skin from the damage to the ligaments and surrounding tissues.

While the presence of swelling and bruising provides visible evidence of a joint injury, other options may either not be directly related to a sprained ankle or could indicate different types of injuries. For example, fractures may present their own set of symptoms and may not always accompany a sprain. Similarly, while lack of weight-bearing ability can occur with a sprained ankle, it does not specifically indicate a sprain as weight-bearing difficulties can arise from various injuries including fractures or more severe soft tissue injuries. Hearing a pop sound during the injury often suggests a more severe ligament tear or possibly a fracture, not exclusively a sprained ankle. Thus, observing swelling and bruising is the most direct and relevant way to identify a sprained ankle.