Female 17 years old Reason: concern for ACL tear History: effusion, instability in knee MENISCI: The menisci are intact.ARTICULAR CARTILAGE AND BONE: There is edema within the lateral tibial plateau posteriorly as well as within the lateral femoral condyle anteriorly above the anterior horn of the lateral meniscus. There is slight depression of the anterior surface of the lateral femoral condyle above the anterior horn of the lateral meniscus, likely representing impaction fracture sustained at the time of injury. There is edema in the far medial femoral condyle. The cartilage is intact.LIGAMENTS: There is rupture of the anterior cruciate ligament through its mid to proximal fibers. The PCL, MCL, and LCL complex are intact. No edema is present within the posterior lateral corner. EXTENSOR MECHANISM: Extensor mechanism is intact.ADDITIONAL
1.Anterior cruciate ligament tear.2.Edema in Hoffa's fat pad superolaterally may reflect patellofemoral tracking abnormality.