21-year-old male with knee dislocation which was reduced during football yesterday. Previous patellar dislocation and MCL injury. Evaluate for knee damage. MENISCI: The medial and lateral meniscus appear intact.ARTICULAR CARTILAGE AND BONE: There is heterogeneity of the articular cartilage of the lateral facet and median eminence of the patella indicating degeneration. There is also focal degeneration of the articular cartilage of the lateral aspect of the lateral facet of the femoral trochlea with underlying subchondral cyst formation. There are small foci of bone marrow edema, likely representing contusions within the lateral tibial plateau and lateral femoral condyle, just above the anterior horn of the lateral meniscus. The cartilage overlying the femoral contusion appears slightly thin.LIGAMENTS: There is rupture of the ACL through its mid/distal substance. There is perhaps slight thickening of the superficial band of the MCL perhaps representing prior injury. The PCL appears intact. The LCL appears intact.EXTENSOR MECHANISM: The medial patellofemoral ligament appears slightly thickened at its femoral attachment suggesting prior injury, but we see no increased signal abnormality to suggest an acute injury. The extensor mechanism appears intact.ADDITIONAL
1. ACL tear with bone contusions.2. Patellofemoral cartilage degeneration.3. Joint effusion, Baker's cyst, and other findings as described above.