72-year-old male with left knee pain. MENISCI: There is a horizontal cleavage tear through the body of the medial meniscus that extends into the posterior horn of the meniscus. The anterior horn appears intact. The lateral meniscus appears intact.ARTICULAR CARTILAGE AND BONE: There is full-thickness cartilage loss along the weightbearing portion of the medial femoral condyle and medial tibial plateau with underlying degenerative subchondral signal abnormality. There is superficial degeneration of the articular cartilage of the medial facet of the patella. There is focal full-thickness degeneration of the articular cartilage of the trochlea centrally and extending into the lateral facet. There is a small focus of degenerative subchondral signal abnormality within the patella along the lateral facet, inferiorly.LIGAMENTS: The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Osteoarthritis most severely affecting the medial tibiofemoral compartment.2. Medial meniscus tear as described above.3. Large joint effusion with extension into a Baker's cyst.4. Fluid collection along the myotendinous junction of the popliteus may represent a ganglion.5. Edema and mild fluid signal intensity within the subcutaneous fat anterior to the patellar tendon is nonspecific but may represent a mild bursitis.