20-year-old male with blunt force trauma to the knee 4 weeks ago. Persistent lateral knee pain and effusion. Evaluate for meniscal or chondral damage. MENISCI: The medial and lateral menisci are morphologically normal.ARTICULAR CARTILAGE AND BONE: There is abnormal marrow signal along the medial tibial plateau anteriorly and posteriorly as well as within the medial femoral condyle posteriorly. There is a joint effusion about the knee extending to the suprapatellar space. The articular cartilage is morphologically normal forLIGAMENTS: There is laxity of the lateral collateral ligament with surrounding intermediate signal intensity representing at least a partial thickness tear. There is discontinuity of a portion of the posterior cruciate ligament with surrounding fluid signal compatible with a at least a partial-thickness tear. The medial collateral ligament appears normal. The anterior cruciate ligament appears normal.EXTENSOR MECHANISM: The extensor mechanism is intact.ADDITIONAL
1. Findings compatible with at least a partial thickness tear of the posterior cruciate ligament and lateral collateral ligament.2. Bone marrow contusion pattern along the medial femoral condyle and medial tibial plateau.