44 year-old male. Left knee pain-more anterolateral knee pain with some posterior pain as well. MENISCI: The anterior horn and anterior half of the body of the lateral meniscus is diminutive with branching signal abnormality consistent with complex tearing. The posterior horn is spared. The medial meniscus is intact without evidence of a tear.ARTICULAR CARTILAGE AND BONE: Diffuse articular cartilage thinning of the lateral tibiofemoral compartment with a near full thickness to full thickness defect at the posterior aspect of the femoral condyle. Medial tibiofemoral and patellofemoral compartment are intact without focal defects. Tricompartmental osteophytes. Small subchondral cyst in the tibia near the ACL insertion.LIGAMENTS: ACL, PCL, MCL, and LCL are intact.EXTENSOR MECHANISM: No significant abnormality noted.ADDITIONAL
1. Complex tearing of a diminutive anterior horn and body of the lateral meniscus.2. Cartilage degeneration in the lateral tibiofemoral compartment.3. Small Baker's cyst.