Loose body on radiograph. History of patellar dislocation medial sided knee pain. MENISCI: Adjacent to the anterior horn of the lateral meniscus there is a parameniscal cyst. The menisci are otherwise unremarkable.ARTICULAR CARTILAGE AND BONE: There is focal thinning of the patellar cartilage at the lateral facet, with a subchondral cyst identified in the lateral patella. There is mild bone marrow edema at the lateral femoral condyle.LIGAMENTS: No significant abnormality noted. EXTENSOR MECHANISM: No significant abnormality noted.ADDITIONAL
1. Loose body within the anteromedial aspect of the joint, with moderate effusion.2. Thinning of the cartilage of the lateral patella with a patellar subchondral cyst and adjacent anterior parameniscal cyst.