12-year-old female status post patellar dislocation. Assess for loose bodies. MENISCI: Again seen is a thin linear band of horizontally oriented intermediate signal abnormality within the posterior horn and body of the lateral meniscus which extends to the tibial articular surface within the posterior horn, and to the femoral articular surface within the body, compatible with a tear, which appears identical to the prior study. The anterior horn appears intact. The medial meniscus appears intact. ARTICULAR CARTILAGE AND BONE: Again seen is an osteochondral defect along the lateral aspect of the medial femoral condyle which appears similar to the prior study. The overlying articular cartilage appears slightly thinned but is otherwise intact. There are tiny cysts adjacent to the defect, but we see no fluid signal intensity along the defect to suggest instability. The articular cartilage of the lateral tibiofemoral compartment appears intact. There is edema within the inferomedial patella as well as within the anterolateral aspect of the lateral femoral condyle likely reflecting recent patellar dislocation. The superior aspect of the femoral trochlea is convex indicating femoral trochlear dysplasia. The tibial tubercle to trochlear groove distance is 12 mm which is within normal limits. We see no fluid-filled articular cartilage defects.LIGAMENTS: The patellar attachment of the medial patellofemoral ligament appears intact. The femoral attachment is not well visualized, but we see no edema within the vicinity of the ligament to indicate an acute tear. The cruciate and collateral ligaments appear intact.EXTENSOR MECHANISM: The quadriceps and patellar tendons are intact. The Insall-Salvati ratio is 1.3, indicating mild patella alta.ADDITIONAL
1. Findings indicating recent patellar dislocation, as described above, with associated femoral trochlear dysplasia and mild patella alta. We see no loose body within the joint.2. Osteochondral defect of the medial femoral condyle appearing similar to the prior study.3. Horizontal tear of the lateral meniscus appearing similar to the prior study, which is of uncertain current clinical significance.