What causes chronic ankle instability?

An ankle sprain can stretch or tear the ligaments on the outside of the joint. If the tissue remains loose or the ankle does not regain its full movement, strength, and balance responses, the foot may roll again during uneven walking, turning, or sport.

Repeated sprains can further irritate the joint and reinforce an unstable movement pattern. Less common contributors include a fracture that did not heal as expected, tendon problems, poor foot control, or an underlying alignment issue. A giving-way history helps the clinician decide what needs checking.

Assessment may include ankle movement, ligament tenderness, calf and foot strength, single-leg balance, walking, and sport-specific tasks. Rehabilitation commonly rebuilds range of motion, calf and foot control, balance reactions, and confidence before demanding activity is resumed. A brace or tape may provide short-term support during higher-risk activities.

Arrange an assessment if the ankle repeatedly gives way, remains swollen, or cannot tolerate normal walking after a sprain. Seek urgent care after a new injury if you cannot bear weight, the ankle looks deformed, pain is severe, or the foot becomes numb, pale, or unusually cold.

Ask which ligament or structure appears affected, whether a fracture or tendon problem needs excluding, and which balance and strengthening exercises fit your stage of recovery. Ask when a brace is useful and how return to sport will be tested.