52-year-old male with history of the effusion and pain. MENISCI: There is branching signal abnormality within the posterior horn of the medial meniscus extending into the body which contacts both articular surfaces compatible with a complex tear. There is an additional vertical component within the posterior horn extending to the femoral articular surface which fills with fluid suggesting an unstable defect. There is additional globular signal abnormality within the remaining meniscus which is likely degenerative in etiology. There is attenuation and mild deformity of the body and anterior horn of the medial meniscus which may reflect prior partial meniscectomy. If there is no surgical history, then this likely represents chronic attritional tearing. The lateral meniscus is intact.ARTICULAR CARTILAGE AND BONE: Mild focal increased signal abnormality within the articular cartilage along the inferior aspect of the patella indicating mild degeneration. We see no discrete fluid filled defects of the articular cartilage. There are small tricompartmental osteophytes.LIGAMENTS: The PCL is abnormally thickened which may represent prior injury or mild mucoid degeneration. There is mild thickening and increased signal abnormality within the lateral collateral ligament which may reflect mild degeneration, however we see no discrete ligamentous tear. The ACL and MCL are intact.EXTENSOR MECHANISM: The extensor mechanism is intact.ADDITIONAL
1.Moderate-sized joint effusion.2.Complex tear of the posterior horn of the medial meniscus.3.Mild degenerative changes and other findings as above.