Reason: assess for meniscal vs cruciate injury, history of popping injury with minor trauma, no significant effusion, no focal tenderness, unable to fully extend. There are tricompartmental osteophytes and a small joint effusion.MENISCI: Hyperintense signal within the posterior horn of the lateral meniscus extends to the articular surface, representing a probable vertical tear of the posterior horn of the lateral meniscus.ARTICULAR CARTILAGE AND BONE: There is thinning of the medial articular cartilage with a full-thickness defect posteriorly. There is generalized thinning of the articular cartilage laterally and marked loss of articular cartilage along the medial facet of the patella.LIGAMENTS: Sequela from prior ACL repair are noted without complication. The PCL, MCL, and LCL are intact. EXTENSOR MECHANISM: No additional significant abnormalities noted.ADDITIONAL
1. Probable vertical tear of the posterior horn of the lateral meniscus.2. Multiple rounded densities posteromedially may represent multiple intra-articular loose bodies. These could be confirmed with CT examination.3. Degenerative thinning and full-thickness defects of the articular cartilage.