Pain and swelling of the knee MENISCI: Lateral meniscus: There is complex tearing and maceration of the posterior horn at the junction of the posterior horn and body. There is horizontal tearing of the anterior horn as well.Medial meniscus: The medial meniscus is normal.ARTICULAR CARTILAGE AND BONE: Lateral compartment: There is full-thickness loss of the articular cartilage of the lateral compartment posteriorly with underlying cystic degenerative change. Thinning of the articular cartilage is noted anteriorly. Medial compartment: The articular cartilage of the medial compartment is relatively intact.Patellofemoral compartment: There is full-thickness articular cartilage loss of both the lateral patellar facet and femoral trochlea with associated degenerative marrow signal. Full-thickness articular loss of the medial facet of the femoral trochlea is also noted inferiorly.LIGAMENTS: No significant abnormality noted. Specifically, the ACL is intact.EXTENSOR MECHANISM: No significant abnormality noted.ADDITIONAL
1. Complex tear of the lateral meniscus.2. Intact ACL.3. Osteoarthritis and cartilage loss particularly of the lateral and patellofemoral compartments, further detailed above.4. Moderate size joint effusion with large Baker's cyst with additional findings described above.