In radiology, the deep lateral femoral notch sign is a finding on a lateral radiograph that is considered an indirect sign of a torn anterior cruciate ligament (ACL). [1] [2] It is an abnormal deepening of the lateral condylopatellar sulcus from an osteochondral impaction fracture. [1] [3] A depth greater than 1.5 mm is a reliable sign of a torn ACL. [1]
In radiology, the deep lateral femoral notch sign is a finding on a lateral radiograph that is considered an indirect sign of a torn anterior cruciate ligament (ACL). [1] [2] It is an abnormal deepening of the lateral condylopatellar sulcus from an osteochondral impaction fracture. [1] [3] A depth greater than 1.5 mm is a reliable sign of a torn ACL. [1]