What does a clunk indicate during the Ankle Anterior Drawer Test?

A clunk during the Ankle Anterior Drawer Test specifically suggests instability of the anterior talofibular ligament (ATFL). This test is designed to assess the integrity of the ligaments that stabilize the ankle joint, primarily focusing on the ATFL, which is susceptible to injury, especially during activities that involve rapid changes in direction or high-impact landings.

When performing the test, a noticeable clunk indicates that the talus is translating excessively forward in relation to the tibia due to the compromised integrity of the ATFL. This forward movement is abnormal and signals that the ligament is unable to provide adequate support, thus confirming ATFL instability. This response helps clinicians diagnose potential sprains or tears in this critical ligament, guiding appropriate intervention and rehabilitation measures for the patient.