45-year-old female with right knee pain. Evaluate for meniscus tear. MENISCI: The medial meniscus appears intact. The lateral meniscus appears intact.ARTICULAR CARTILAGE AND BONE: Heterogeneous bone marrow signal abnormality most consistent with residual islands of red marrow. There is subjective thinning of the articular cartilage of the medial tibiofemoral compartment. There is relative sparing of the lateral tibiofemoral compartment. There is a focal partial thickness articular cartilage cleft along the lateral facet of the patella. There is underlying subchondral signal abnormality.LIGAMENTS: The ACL and PCL appear intact. There is thickening and increased signal intensity on fluid sensitive sequences within the proximal fibers of the superficial band of the MCL which may reflect a sprain. The MCL appears intact. The LCL appears intact.EXTENSOR MECHANISM: The extensor mechanism appears intact. There is a small amount of fluid within the deep infrapatellar bursa, which is likely of no current clinical significance.ADDITIONAL
1. Findings suggestive of patellofemoral instability with a partial-thickness articular cartilage cleft along the lateral facet of the patella.2. Findings suggestive of an MCL sprain.