18-year-old female with locked left knee. Several sequences are limited by patient motion artifact.MENISCI: We see no bucket handle tear. The anterior horn of the medial meniscus divides into two separate structures at its root, which could conceivably represent a chronic vertical tear, although we suspect this represents normal variant anatomy for this patient. ARTICULAR CARTILAGE AND BONE: We see no fluid-filled articular cartilage defects. There is moderate synovitis of the knee, particularly posteriorly with a joint effusion concentrated anteriorly in the knee. Multiple foci of rounded and bandlike low signal intensity in the suprapatellar pouch and also in the posterior knee may represent a combination of thickened synovial folds and debris, although we see no discrete articular cartilage defect. There is mild irregularity of the posterolateral surface of the lateral femoral condyle, which may represent early erosion. There also appear to be small erosions around the margin of the tibial plateau. There is mild marrow edema underlying these suspected erosions. LIGAMENTS: Cruciate and collateral ligaments are intact. EXTENSOR MECHANISM: Extensor mechanism is intact.ADDITIONAL
1.Surgical changes of prior arthroscopy.2.Synovitis of the knee with what appear to be small erosions. This may represent an inflammatory arthritis or less likely synovial chondromatosis. Conventional radiographs are recommended for further evaluation.3.No bucket handle tear is evident. Other findings as above.