A complete rupture is debilitating, could potentially cause immense pain, and involves fast health-related/surgical intervention to stop long term tissue destruction.  Swelling and redness of the ankle, coupled having a fever, could be an indication of an an infection that needs fast treatment and intervention. Abunion is a bony bulge https://www.theorthopaedicandpainpractice.com/the-definitive-guide-to-diagnosing-and-treating-ankle-pain-in-singapore/