21-year-old male with pain in the right knee. MENISCI: There is a complete longitudinal tear of the posterior horn of the lateral meniscus originating at the attachment of the ligament of Wrisberg ("Wrisberg rip") which is seen on multiple consecutive sagittal images. The anterior horn of the lateral meniscus appears intact. The medial meniscus appears intact. ARTICULAR CARTILAGE AND BONE: There are bone contusions along the posterolateral aspect of the tibial plateau and lateral femoral condyle above the anterior horn of the lateral meniscus. There is slight depression of the articular surface of the lateral femoral condyle above the anterior horn of the lateral meniscus, indicating an impaction fracture. There is also bone marrow edema within the posterior aspect of the medial tibial plateau and along the medial aspect of the medial femoral condyle representing additional contusions.LIGAMENTS: There is rupture of the ACL through its proximal fibers. There is low to intermediate signal intensity along the anterior margin of the torn ligament presumably representing displaced fibers. The PCL appears intact. The superficial band of the MCL appears intact. There is amorphous immediate signal intensity between the superficial fibers and the underlying medial femoral condyle, and we cannot exclude the possibility of a tear of the deep meniscofemoral component of the MCL.EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
ACL tear, lateral meniscus tear, and other findings as described above.