14-year-old female with left knee pain with a history of patellar instability. MENISCI: The medial and lateral menisci appear intact.ARTICULAR CARTILAGE AND BONE: There is lateral translation of the patella relative to the femoral trochlea. The femoral trochlea is abnormally shallow, indicating dysplasia. There is a full-thickness articular cartilage defect of the patella along the inferior aspect of the median eminence with edema type signal within the underlying bone marrow. There is also near full-thickness to full-thickness cartilage loss along the medial facet of the patella. There is edema within the lateral aspect of the lateral femoral condyle likely representing a contusion from transient patellar dislocation. The articular cartilage along the anterior lateral aspect of the lateral femoral condyle is slightly increased in signal intensity likely reflecting posttraumatic degeneration. LIGAMENTS: The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: The quadriceps and patellar tendons are intact. The tibial tuberosity trochlear groove distance is approximately 15 mm.ADDITIONAL
Findings compatible with the stated history of patellar instability with femoral trochlear dysplasia, lateral displacement of the patella, and articular cartilage defects/degeneration as well as other findings as described above.