Abstract: Chronic lateral ankle instability (CAI) is defined as the occurrence of recurrent bouts of lateral ankle instability. Clinical examination should be supplemented by a complete, directed imaging assessment. Imaging occurred by simple comparative AP and lateral weight-bearing ankle X-ray, stress X-rays, ultrasound, CT arthrography and MRI. Arthroscopic classification of chronic lateral ankle instability is the stable ankle, moderate lateral ankle instability, severe lateral ankle instability and severe global ankle instability. Management of chronic lateral ankle instability focuses on a combination of peroneal muscle strengthening, balance reflex training, and external bracing as needed to prevent recurrent injury. Patients who fail these measures are candidates for lateral ankle ligament reconstruction.
