63-year-old female. Knee pain, catching, locking. Evaluate for meniscus tear. MENISCI: The lateral meniscus is completely torn from the tibiofemoral compartment articular surface from the posterior half of the body to nearly the entire posterior horn except for a small residual fragment that remains at the root. A piece of displaced meniscus is present in the lateral gutter (series 901, image 16). No evidence of a tear in the medial meniscus. ARTICULAR CARTILAGE AND BONE: Marked lateral tibiofemoral compartment diffuse cartilage thinning with near full to full thickness focal cartilage defects at the weight-bearing surface, tibial worse than femoral (series 1001, image 15). There is underlying degenerative sclerosis and edema. High signal of the patellofemoral cartilage and mild diffuse thinning consistent with chondromalacia; no focal defect.Small degenerative cysts at the ACL insertion on the tibia.LIGAMENTS: MCL, LCL, ACL, and PCL are intact.EXTENSOR MECHANISM: No significant abnormality noted.ADDITIONAL
1. Extensive complete, displaced tear of the posterior horn and posterior body of the lateral meniscus. The displaced fragment appears to be in the lateral gutter.2. Severe lateral tibiofemoral compartment cartilage thinning with full thickness cartilage defects, tibial worse than femoral articular surface.