57-year-old male with left knee pain, medial sided. MENISCI: There is fragmentation and maceration of the posterior horn, body and anterior horn of the lateral meniscus. There are associated subcentimeter foci of fluid signal abnormality along the posterior aspect of the meniscus consistent with parameniscal cyst formation.There is globular increased signal abnormality within the posterior horn of the medial meniscus consistent with intrasubstance degeneration. Some of the signal extends to the tibial and femoral articular surface consistent with degenerative tearing/fraying which extends to the body of the meniscus. There is a linear focus of signal abnormality within the posterior horn of the medial meniscus which extends to the femoral articular surface consistent with a complex tear with a horizontal component.ARTICULAR CARTILAGE AND BONE: There is full-thickness articular cartilage degeneration along the lateral facet of the patella with large areas completely devoid of articular cartilage. There is degenerative underlying subchondral signal abnormality. There is near full-thickness to full-thickness articular cartilage degeneration of the articular cartilage along the lateral facet of the femoral trochlea with underlying degenerative subchondral signal abnormality. There is near full-thickness articular cartilage degeneration along the lateral tibiofemoral compartment particularly affecting the posterior aspect of the lateral tibial plateau. The medial tibiofemoral compartment appears relatively spared.LIGAMENTS: The PCL appears intact. The ACL is indistinct with associated foci of lobulated fluid signal abnormality. These findings likely represent a combination of chronic tearing as well as mucoid degeneration. There is thickening of the proximal fibers of the superficial band of the MCL which may reflect prior injury or sprain. The MCL and LCL appear intact.EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Degenerative tearing of the medial and lateral meniscus with parameniscal cyst formation as described above.2. Findings consistent with disruption of the ACL.3. 14 mm loose body within the joint as described above.4. Full-thickness articular cartilage degeneration most pronounced along the patellofemoral and lateral tibiofemoral compartments.5. Nonspecific subcutaneous edema along the anterior medial aspect of the knee.