Juvenile osteochondritis dissecans
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There is a large crater (osteochondral defect) seen in the medial femoral condyle filled by joint effusion associated with subchondral cystic changes as well as focal bone marrow edema.
Osteochondral fragment seen in the intercondylar area just anterior to ACL root.
Large joint effusion reaching the suprapatellar bursa.
Juvenile osteochondritis dissecans occurs in pediatric and adolescent age groups before the closure of growth plates. Many etiologies are hypothesized such as genetic causes, repetitive trauma, inflammation and ischemia. Knee is the commonest site, particularly the posterolateral aspect of the medial femoral condyle. Bilateral involvement is common.