Which of the following is true for a Grade 3 joint sprain?

A Grade 3 joint sprain is characterized by a complete tear of the ligament, which results in significant instability of the joint. This level of sprain typically presents with severe swelling due to the body's inflammatory response to the injury, alongside considerable pain. The loss of function is substantial, as the joint cannot maintain normal stability or movement. Patients experiencing a Grade 3 sprain often find it difficult to use the affected joint due to both the physical instability and the discomfort that arises from the injury. Therefore, the distinctive combination of severe instability, prominent swelling, and marked pain confirms that the correct choice aligns perfectly with the clinical features recognized for a Grade 3 sprain.