What term describes an injury to a ligament at a joint?

The term that describes an injury to a ligament at a joint is a sprain. Ligaments are strong bands of tissue that connect bones at a joint, and when they are overstretched or torn, it results in a sprain. This type of injury often occurs due to sudden movements or stress on the joint, leading to symptoms such as pain, swelling, and limited mobility.

In contrast, a strain refers to an injury to a muscle or tendon, which is different from the ligament-focused definition of a sprain. A fracture is a break in a bone, and a contusion pertains to a bruise caused by a direct blow or impact to the muscle or skin. Understanding these definitions is crucial for distinguishing between different types of orthopedic injuries, particularly in the context of physical activities or sports.