24-year-old man with injury to the right knee 3 days ago, presenting with pain, swelling and decreased range of motion. Patient has history of knee dislocation x5 and prior surgery. MENISCI: The medial and lateral menisci are normal in appearance.ARTICULAR CARTILAGE AND BONE: There is edema within the patella inferomedially, as well as within the lateral femoral condyle anterolaterally, likely representing bone contusions related to recent transient patellar dislocation. The femoral trochlea is abnormally shallow, indicating dysplasia. There is irregularity of the articular cartilage along the medial facet inferiorly, indicating tearing. There is slight depression of the underlying subchondral bone, suggesting an osteochondral fracture. There is also heterogeneity of the articular cartilage of the lateral facet of the femoral trochlea indicating degeneration or chronic tearing. There is also curvilinear low density in the lateral femoral condyle, anteriorly, representing a subchondral fracture. The articular cartilage of the tibiofemoral compartment appears relatively spared.LIGAMENTS: The cruciate and collateral ligaments appear intact. There is edema and irregularity of the medial retinacular structures suggesting injury/tearing. Specifically, the femoral attachment of the medial patellofemoral ligament is not well visualized. There is also increased signal within the fibers of the patellar attachment of the retinaculum, suggesting tearing. Thickening and irregularity of the lateral retinacular structures may be due to prior surgery.  EXTENSOR MECHANISM: The quadriceps and patellar tendons appear intact.ADDITIONAL
Findings indicating recent transient patellar dislocation with lipohemarthrosis and other findings as above. Findings were discussed with Maricela Sandoval on 6/21/2016 at 8:55am. 