17-year-old female with laxity of the MCL. Right knee pain. MENISCI: The medial meniscus appears intact. The lateral meniscus appears intact.ARTICULAR CARTILAGE AND BONE: There is edema within the lateral aspect of the lateral femoral condyle and to a lesser degree within the medial patella, likely reflecting recent transient patellar dislocation. There is increased signal intensity within the articular cartilage along the median eminence of the patella indicating a full-thickness defect which measures approximately 14 mm in diameter. There are multiple cartilage fragments within the anterior knee joint, the largest measuring up to 14 mm located within the suprapatellar pouch. There may also be a smaller defect of the articular cartilage along the far lateral aspect of the weightbearing portion of the lateral femoral condyle, overlying the aforementioned bone contusion. The articular cartilage of the medial compartment appears intact.LIGAMENTS: The ACL and PCL appear intact. The MCL and LCL appear intact. There is edema along the medial retinaculum. The femoral attachment of the medial patellofemoral ligament is not well visualized and is likely torn. There is also edema along the lateral retinaculum.EXTENSOR MECHANISM: The quadriceps and patellar tendons appear intact.ADDITIONAL
Findings indicating recent transient dislocation of the patella with bone contusions, chondral defects, loose chondral fragments within the joint, and likely tear of the medial patellofemoral ligament.