Presentation
Trauma history.
Patient Data
Age: 20 years
Gender: Female
{"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/41773/annotated_viewer_json?lang=us"}
Os trigonum is present. Signs of posterior joint effusion are also noted.
From the case:
Os trigonum
{"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/41774/annotated_viewer_json?lang=us"}
Os trigonum is delineated.
Case Discussion
Os trigonum is one of the bony ossicles of the foot and can be mistaken for a fracture. It sits posterior to the talus on the lateral foot radiograph and represents failure of fusion of the lateral tubercle of the posterior talar process.