Ankle sprains refer to an overstretching or tear of the surrounding ligaments. Symptoms include localized swelling, pain, difficulty weight bearing, and tenderness.
Ankle sprains usually occur as a result of sudden inversion of the foot which overstretches the ligaments on the outside of the ankle. This commonly occurs due to walking on an uneven surface such as the pavement where the slabs may be poorly aligned.
The ankle can also become sprained due to an eversion injury in which causes an overstretch of the ligaments on the inside of the ankle, however, this is uncommon.