1. Indirect and direct signs of anterior cruciate ligament tears
Indirect and direct signs of anterior cruciate ligament tears. (A) Lateral view of the knee shows a joint effusion (white arrow). (B) Frontal radiograph of the knee shows a small bone fragment lateral to the lateral tibial condyle (white arrow) consistent with an avulsion fracture (Segond fracture). (C) Sagittal fluid-sensitive MR image of the knee in a different patient reveals patchy areas of increased signal (*) throughout the lateral femoral condyle and lateral tibial plateau. These represent the “kissing contusions” frequently encountered with ACL tears and the anterior translation of the tibia in relation to the femur. (D) Another sagittal fluid-sensitive MR image of the same knee shows heterogeneously increased signal within and lack of continuity of the ACL fibers (black arrow) consistent with complete disruption. Note the associated joint effusion (white arrows in C and D).
Source: Musculoskeletal, Introduction to Diagnostic Radiology
Citation: Elsayes KM, Oldham SA. Introduction to Diagnostic Radiology; 2015 Available at: Accessed: November 04, 2017
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