Female 13 years old Reason: eval for loose body History: knee pain sports and history of synovial osteochondromatosis MENISCI: The lateral meniscus is intact. The medial meniscus is diminutive.ARTICULAR CARTILAGE AND BONE: Articular cartilage is intact.LIGAMENTS: Complete rupture of the ACL. Medial and lateral collateral ligaments are intact. PCL is intact. EXTENSOR MECHANISM: Extensor mechanism is intact.ADDITIONAL
1.Ossified loose body in the anterior joint space.2.Complete rupture of the ACL.3.Diminutive medial meniscus, raising question of chronic tearing.4.Moderate-sized joint effusion.5.Patella situated lateral to the trochlear groove suggesting patellar instability.