17-year-old male with history of patella alter, patellar subluxation and instability, and OCD lesion noted recent radiograph. MENISCI: The lateral and medial menisci are intact and normal in appearance.ARTICULAR CARTILAGE AND BONE: Increased bone marrow signal intensity in the anterolateral aspect of the lateral femoral condyle compatible with bone contusion, with associated thinning and irregularity of the overlying articular cartilage. There is similar increased bone marrow signal intensity of the posteromedial aspect of the medial third of the patella with thinning of the overlying articular cartilage. The patella is currently in anatomic alignment. No fracture is seen.The tibial tuberosity trochlear groove distance is 9mm, within normal limits. The Insall-Salvati ratio is 1.4 (normal is 0.8-1.2), indicating patella alta.There is an osteochondral defect of the articular surface of the lateral femoral condyle without associated articular cartilage defect. T2 signal hyperintensity peripherally may suggest instability.LIGAMENTS: Anterior and posterior cruciate ligaments are intact. Medial collateral ligament and lateral collateral complex appear intact. The medial retinaculum of the knee appears intact.EXTENSOR MECHANISM: Quadriceps tendon and patellar tendon are intact.ADDITIONAL
Lateral femoral condyle osteochondral defect. Bone contusion to the inferomedial patella and anterolateral aspect of the lateral femoral condyle with associated articular cartilage thinning, sequelae of lateral patellar dislocation. Small-to-moderate joint effusion. 