There are strong ligaments that attach from the shin bone to the heel bone, and these lateral ligaments are frequently injured during sporting activity. When the ligaments are partially torn is termed as an ankle sprain.
Ankle instability is most common in patients that have had a previous ankle sprain. The ankle can give way when walking, especially on uneven surfaces, doing activities and even when standing still.
Individuals with ankle instability may experience repeated turning of the ankle, discomfort and swelling, pain or tenderness and the feeling of instability. If the ankle is unstable there is a risk that arthritis can ensue.