Reason: Evaluate left knee for lateral meniscus tear, loose body. History: left knee pain MENISCI: We see no discrete lateral meniscal tear. There is attenuation of the posterior horn of the medial meniscus with increased signal intensity throughout its substance likely reflecting extensive degeneration and tearing. The root of the posterior horn of the meniscus is not clearly identifiable. There is poorly defined increased signal intensity within the body of the meniscus also likely representing degeneration and perhaps degenerative tearing. The body of the meniscus is extruded medially. Additionally, there is low signal intensity beneath the extruded meniscus which could represent displaced meniscal tissue or a thickened meniscotibial ligament.ARTICULAR CARTILAGE AND BONE: There is severe degeneration of the articular cartilage of the medial tibiofemoral compartment with areas along the weightbearing portion of the medial femoral condyle and medial tibial plateau essentially devoid of articular cartilage with associated degenerative subchondral signal abnormality and cyst formation. There is also heterogeneity of the articular cartilage of the lateral compartment indicating relatively mild degeneration. There is also near full-thickness to full-thickness fissuring of the articular cartilage of the femoral trochlea, centrally. There are tricompartmental osteophytes.LIGAMENTS: There is thickening and increased signal intensity of the ACL and PCL likely representing mucoid degeneration. The collateral ligaments appear intact.EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Severe osteoarthritis of the knee particularly affecting the medial tibiofemoral compartment with extensive tearing of the medial meniscus. We see no discrete lateral meniscal tear or loose body.2. Mucoid degeneration of the cruciate ligaments and other findings as described above.