Male 59 years old Reason: eval for internal derangement History: knee effusion. MENISCI: The body of the medial meniscus appears attenuated compared to that of the lateral meniscus. This may reflect chronic attritional fraying or possibly prior meniscectomy, but we see no discrete meniscal tear.There is a tiny focus of increased signal intensity along the free edge of the body of the lateral meniscus, best seen on the sagittal images, suggestive of a small radial tear of questionable clinical significance. There is globular intrasubstance signal within the anterior and posterior horn suggestive of intrasubstance degeneration.ARTICULAR CARTILAGE AND BONE: There is near-full-thickness to full-thickness degeneration of the articular cartilage of the anterior aspect of the medial tibial plateau. There is signal abnormality in the underlying subchondral marrow that may be degenerative in etiology or reflect prior orthopedic intervention, such as microfracture. There is also near-full-thickness to full-thickness degeneration of the articular cartilage of the medial femoral condyle, just above the posterior horn of the medial meniscus.There is a near-full-thickness to full-thickness degeneration of the articular cartilage of the femoral trochlea, particularly centrally and along the medial facet, with underlying intra-articular osteophytes and subchondral cysts. There is also near-full-thickness degeneration of the articular cartilage of the patella along the medial facet.The articular cartilage of the lateral compartment is relatively intact. There is edema type signal along the posterior aspect of the lateral femoral condyle that is nonspecific and may represent a bone contusion or be degenerative in etiology. There are small tricompartmental osteophytes.LIGAMENTS: Anterior cruciate ligament is intact. There is a prominent meniscofemoral ligament extending from the posterior horn of the medial meniscus to the medial aspect of the lateral femoral condyle, but we see no discrete posterior cruciate ligament; we are uncertain if this reflects prior trauma or a peculiar anatomic variant. The medial collateral ligament appears intact. There is a small ossicle between the medial collateral ligament and underlying medial femoral condyle that is surrounded by low signal intensity that may represent scarring from prior injury. The lateral collateral ligament complex is intact.EXTENSOR MECHANISM: The extensor mechanism is intact.ADDITIONAL
1.Degenerative arthritic changes as described above, predominantly affecting the medial and patellofemoral compartments.2.Findings suggestive of a tiny radial tear of the body of the lateral meniscus. Attenuation of the body of the medial meniscus may reflect chronic attritional fraying or prior partial meniscectomy, but we see no findings to suggest an unstable meniscal tear.3.Nonvisualization of the PCL may reflect prior injury or, perhaps, a peculiar anatomic variant.4.Other findings as described above.