15-year-old male with medial joint line pain and swelling. Evaluate for meniscus tear. MENISCI: The medial and lateral meniscus appear intactARTICULAR CARTILAGE AND BONE: There is mild edema within the medial aspect of the patella. While this can be seen in patient's who recently sustained transient patellar dislocation, there is no edema within the medial retinacular structures or the lateral femoral condyle to support this, and this finding may represent a direct contusion to bone. There is also mild edema within the anteromedial aspect of the medial femoral condyle that may represent a direct bone contusion. The articular cartilage appears intact. The medial facet of the femoral trochlea appears mildly hypoplastic, relative to the lateral facet, which may reflect mild femoral trochlea dysplasia. There is slight lateral translation of the patella relative to the femoral trochlea. The tibial tubercle to trochlear groove distance measures 14 mm, within normal limits.LIGAMENTS: The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: The quadriceps and patellar tendon appear intact. The Insall-Salvati ratio is within normal limits.ADDITIONAL
1. Normal appearing menisci.2. Edema within the medial aspect of the patella and medial femoral condyle may represent bone contusions. While edema within the medial aspect of the patella can be seen in transient dislocation of the patella, there is no edema within the medial retinacular structures or lateral femoral condyle to support this.3. Edema within the superolateral aspect of Hoffa's fat pad can be seen in patellofemoral instability. There is also slight lateral translation of the patella relative to the femoral trochlea. The medial facet of the femoral trochlea appears slightly hypoplastic suggesting mild dysplasia.