Reason: rule out ligamentous/meniscal injury History: pain after twisting injury MENISCI: The medial and lateral meniscus appear intactARTICULAR CARTILAGE AND BONE: There is increased bone marrow signal abnormality within the medial aspect of the patella and lateral femoral condyle indicating prior transient lateral dislocation of the patella. The medial facet of the femoral trochlea is small relative to the lateral facet. Additionally the femoral trochlea appears shallow superiorly, indicating femoral trochlear dysplasia.LIGAMENTS: The cruciate and collateral ligaments appear intact EXTENSOR MECHANISM: The quadriceps and patellar tendons appear intact. The posterior and mid substance fibers of the MPFL are indistinct with associated increased signal abnormality on fluid sensitive sequences, indicating partial thickness tearing/sprain. Some of the fibers of the MPFL appear intact.ADDITIONAL
1. Findings consistent with prior transient patellar dislocation and partial thickness tearing/sprain of the MPFL.2. Patella alta, borderline tibial tubercle to trochlear groove distance, femoral trochlear dysplasia, and edema within the superolateral aspect of Hoffa's fat pad can be seen in patellofemoral instability.