What Happens In an Ankle Sprain
A sprain is a stretch or tear of the ligaments that hold the ankle bones together. The most common pattern is an inversion sprain - the foot rolls inward, stressing the ligaments on the outside of the ankle (the anterior talofibular ligament most often). Eversion and high ankle sprains are less common but more serious.
Grading
- Grade 1: Mild stretch, no instability. Pain and minor swelling.
- Grade 2: Partial tear with some laxity. Significant swelling and bruising.
- Grade 3: Complete rupture. The ankle feels unstable, and weight-bearing is often difficult.
Why Diagnosis Matters
Most ankle sprains heal - but a substantial percentage are mismanaged at the start, leading to chronic ankle instability, repeat sprains, and eventually arthritis. A careful exam (and imaging when indicated) tells us exactly which ligaments are involved and whether anything else - a small fracture, a tendon injury, an osteochondral lesion - is hiding under the swelling.
Treatment
For Grade 1 and most Grade 2 sprains: protected weight-bearing, bracing, and a structured progression of mobility, strength, and balance work. For high-grade or recurrent injuries: imaging, possible immobilization, and in select cases ligament repair to restore stable, confident ankle mechanics.
When To Come In
If you cannot bear weight comfortably within a few days, if the swelling is severe, or if the ankle keeps “giving way” weeks later - see Dr. O’Carroll. Catching instability early prevents long-term joint damage.