Male 11 years old Reason: left knee injury/patellar dislocation History: knee pain and swelling MENISCI: The menisci are intact.ARTICULAR CARTILAGE AND BONE: There is a bone contusion of the medial patella as well as the lateral femoral condyle in a pattern consistent with transient patellar dislocation. The medial patellofemoral ligament is partially torn from the medial facet of the patella. No patellofemoral articular cartilage or other articular cartilage defects are present.LIGAMENTS: The ACL, PCL, MCL, and LCL complex are intact. EXTENSOR MECHANISM: Extensor mechanism is intact.ADDITIONAL
1.Transient patellar dislocation bone contusion pattern with associated partial medial patellofemoral ligament tear.2.Moderate to large joint effusion.