Human: What is the difference between a sprained ankle and a broken ankle? Assistant: 
The main difference between a sprained ankle and a broken ankle is that a sprained ankle is typically caused by an external force, such as a fall or twist, while a broken ankle is usually due to internal forces like bone fractures. A sprained ankle will typically cause pain and swelling in the joint area, while a broken ankle may result in severe pain, difficulty walking, and bruising around the affected area.