57-year-old male with pain. MENISCI: There is a complex tear of the medial meniscus consisting of a horizontal component within the posterior horn that extends to the tibial articular surface. There is also increased signal intensity within the body of the medial meniscus replacing most of its cross section as seen on coronal image 18, suggesting a radial component to the tear as well. There is also mild medial extrusion of the body of the medial meniscus. The anterior horn appears relatively intact. There is parameniscal cyst formation along the posterior half of the meniscus. There is intrasubstance degeneration of the posterior horn of the lateral meniscus. The anterior horn appears intact.ARTICULAR CARTILAGE AND BONE: There is a small near full-thickness to full-thickness cleft of the articular cartilage of the patella, centrally, with additional moderate thinning of the cartilage along the lateral facet. There is also moderate diffuse degeneration of the articular cartilage of the femoral trochlea with central osteophytes. Subjectively, the articular cartilage of the medial femoral condyle appears thinned and heterogeneous indicating degeneration, particularly along the posterior aspect of the condyle. There is also heterogeneous signal of the articular cartilage of the lateral tibial plateau beneath the posterior horn of the meniscus indicating focal full-thickness articular cartilage degeneration. There are tricompartmental osteophytes. There is a prominent osteophyte projecting from the posterior aspect of the medial tibial plateau. A separate ossicle is seen posterior to the PCL immediately lateral to this osteophyte which could represent a loose body within the joint. There is intermediate signal intensity within the adjacent soft tissues suggesting a synovitis.LIGAMENTS: The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: The patellar tendon is slightly thickened which may reflect a mild tendinosis, but the extensor mechanism appears intact. ADDITIONAL
1. Medial meniscus tear as described above.2. Osteoarthritis with tricompartmental cartilage degeneration as described above.3. Slight thickening of the patellar tendon may reflect a mild tendinosis.4. Small Baker's cyst and possible loose body within the posterior aspect of the joint.5. Lobulated focal near fluid signal intensity collection which probably represents a ganglion as described above.