17 years old, Female, History: knee injury MENISCI: The medial meniscus is intact. Increased signal intensity within the anterior horn of the lateral meniscus indicates undersurface tearing.ARTICULAR CARTILAGE AND BONE: There is significant bone marrow edema of the anterior lateral femoral condyle as well as the posterior lateral tibial condyle. This pattern of injury suggests a pivot shift mechanism of injury. The articular cartilage is intact.LIGAMENTS: Increased signal intensity and irregularity of the anterior cruciate ligament indicates a tear. Retraction of ligamentous fibers indicates a complete tear. No bone fragment is identified to suggest an avulsion of the ACL. The PCL, LCL complex, and MCL are intact.EXTENSOR MECHANISM: The extensor mechanism is intact.ADDITIONAL
1.Complete ACL tear.2.Undersurface tearing of the anterior horn of the lateral meniscus.3.Moderate joint effusion.