Female, 19 years old. Knee pain. Evaluate for meniscus and ACL tear. MENISCI: The medial meniscus is intact. The body of the lateral meniscus is mildly extruded. The anterior horn of the lateral meniscus is small in size and displaced superiorly by underlying fluid, although a clear displaced fragment is not definitely identified.ARTICULAR CARTILAGE AND BONE: There is and approximately 1 cm full-thickness focal cartilage defect in the lateral femoral condyle with associated underlying bone marrow edema. There is also bone marrow edema in the posterior aspect of the lateral tibial plateau with mild overlying cartilage irregularity. There is slight thinning of the articular cartilage in the medial femoral condyle without focal defect. Patellofemoral cartilage is intact.LIGAMENTS: Abnormal intermediate and high signal in the region of the ACL indicates a complete tear. The PCL is intact. The collateral ligaments are intact. EXTENSOR MECHANISM: No significant abnormality noted.ADDITIONAL
1.Complete tear of the ACL with associated bone marrow edema and focal cartilage loss involving the lateral compartment.2.Abnormal position and morphology of the anterior horn of the lateral meniscus suggests a tear, although the displaced fragment is not clearly identified.