55 year-old female. Knee pain, instability, falls. MENISCI: Complete radial tear of the medial meniscal body with 4 mm of medial extrusion . Globular signal abnormality within this meniscus consistent with underlying degeneration. Lateral meniscus is intact.ARTICULAR CARTILAGE AND BONE: Full thickness cartilage loss of the medial femoral condyle. Near full thickness to full thickness articular cartilage loss of the medial tibia. Diffuse cartilage thinning of the lateral tibiofemoral compartment with no focal defect. Patellofemoral compartment cartilage is markedly thinned with fraying in the medial lateral facet. Small degenerative cyst in the lateral facet. Tricompartmental osteophytes. Patchy edema signal in the distal femur and proximal tibia, most likely degenerative in etiology.LIGAMENTS: ACL and PCL are intact.EXTENSOR MECHANISM: Intact.ADDITIONAL
1. Complete radial tear of a degenerated medial meniscus with associated extrusion.2. Moderate osteoarthritis most severe in the medial tibiofemoral compartment with areas of full thickness cartilage loss.3. Moderate knee joint effusion.