17-year-old male patient with medial knee pain and instability. Note that evaluation on several sequences is limited due to patient motion artifact.MENISCI: The lateral meniscus appears intact. There is linear obliquely oriented increased signal intensity within the peripheral fibers of the posterior horn of the medial meniscus extending to the tibial articular surface, suggesting a longitudinal undersurface tear. The body and anterior horn of the medial meniscus appear intact.ARTICULAR CARTILAGE AND BONE: There is edema type signal within the posterior aspect of the lateral tibial plateau as well as the anterior aspect of the lateral femoral condyle. There is slight flattening of the lateral femoral condyle overlying the contusion, indicating a mild impaction fracture. A small contusion is also noted in the far medial aspect of the medial tibial plateau. We see no fluid-filled articular cartilage defects.LIGAMENTS: There is a full-thickness midsubstance tear of the anterior cruciate ligament. The superficial band of the medial collateral ligament is intact. There is a curvilinear low signal intensity structure extending superiorly from the body of the medial meniscus between the medial femoral condyle in the superficial band of the MCL that is of uncertain clinical significance. While this could conceivably represent a meniscofemoral coronary ligament tear, this seems unusual in light of the intact superficial band of the medial collateral ligament. The posterior cruciate ligament, lateral collateral ligament complex, and patellar retinacula are intact.EXTENSOR MECHANISM: The extensor mechanism is intact.ADDITIONAL
Midsubstance rupture of the anterior cruciate ligament with bone contusions, medial meniscus tear, and other findings as described above.