Effusion and pain. Evaluate meniscus. MENISCI: There is globular increased internal signal throughout the medial meniscus, with attenuation of the posterior horn compatible with tearing and/or degeneration. The body of the medial meniscus is slightly medially extruded. The lateral meniscus is intact. ARTICULAR CARTILAGE AND BONE: There is an approximately 10 mm full thickness focal defect in the articular cartilage of the weight bearing portion of the medial femoral condyle. There are mild reactive bone marrow changes in the medial femoral condyle and medial tibial plateau associated with this defect as well as the aforementioned medial meniscus degeneration/tearing. There is mild degenerative-type signal in the articular cartilage of the patellofemoral and lateral tibiofemoral compartments, without fluid-filled defects. LIGAMENTS: No significant abnormality noted. EXTENSOR MECHANISM: No significant abnormality noted.ADDITIONAL
1. Globular increased internal signal and attenuation of the posterior horn of the medial meniscus compatible with tearing and/or degeneration.2. 10 mm full-thickness focal defect in the articular cartilage of the medial femoral condyle. 3. Mild reactive bone marrow changes in the medial femoral condyle and medial tibial plateau reflecting the aforementioned abnormalities. 