72-year-old male with right knee instability and giving way episodes. Evaluate right knee for loose body versus unstable meniscal tear. MENISCI: There is marked signal abnormality and degeneration of the medial meniscus. A portion of the medial meniscus appears partially adherent along the posterior and anterior insertion. There is a horizontal tear through the body of the lateral meniscus with continuation into the posterior horn. The tear extends to the inferior articular surface with fraying of the inner edge. ARTICULAR CARTILAGE AND BONE: There is minimal bone marrow edema along the medial tibial plateau. The articular cartilage is absent along the medial compartment. There is abnormal signal and thinning within the articular cartilage of the lateral compartment with numerous defects throughout. The articular cartilage of the patellofemoral compartment is thinned with abnormal signal and fraying.LIGAMENTS: There is degeneration of the ACL with complete tear. The PCL is thickened with increased signal. The PCL appears deformed with buckling. The MCL is intact, however, there is increased signal within it. The lateral collateral ligament appears intact. EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
Complete tear of the ACL with cartilage and meniscal defects as above.