PMC3307214_01
Lateral radiograph of the right knee following the initial injury demonstrates a large suprapatellar joint effusion (asterisk) and undulating contour of the patellar tendon (arrow).
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F1
She sought emergency medical attention where radiographs revealed a joint effusion, and a wavy appearance to the tendon [Figure 1].
T2-weighted fast spin echo fat-suppressed images of the right knee. (a) Coronal image shows complete absence of anterior cruciate ligament fibers (broken arrow) consistent with a complete tear. There is also contusion within the posterior medial and lateral tibial plateau (arrowhead) and lateral femoral condyle (arrowhead). (b) Sagittal image with a large joint effusion (asterisk), undulation of the patellar tendon (arrow), and complete tear of the anterior cruciate ligament (dashed arrow). (c) Axial image demonstrates near complete tear of the patellar tendon (arrow) and edema within the posterior tibial plateau (arrowheads).
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F2
The MR examination of the right knee was obtained 10 days later and demonstrated abnormal increased T2 signal in the midsubstance of the ACL and abnormal orientation of the ligament consistent with a complete ACL disruption [Figure 2].