Presentation
Recurrent ankle twist and pain. Referred for an ultrasound of lateral ankle ligaments.
Patient Data
Age: 40 years
Gender: Female
From the case:
Vacuum phenomenon in ankle joint
{"current_user":null,"step_through_annotations":true,"access":{"can_edit":false,"can_download":true,"can_toggle_annotations":true,"can_feature":false,"can_examine_pipeline_reports":false,"can_pin":false},"extraPropsURL":"/studies/82843/annotated_viewer_json?lang=us"}
There is normal thickness, fibrillary echopattern of the anterior talofibular ligament. There are echogenic line / tiny echogenic foci under the anterior talofibular ligament. These foci change position with ankle movements.
Case Discussion
The case shows a normal anterior talofibular ligament between lateral malleolus and talus. There is air in the ankle joint under the ligament which a normal finding.