18-year-old female with history of fall, knee pain, swelling, and instability. Evaluate for ACL tear. MENISCI: Increased linear signal in the posterior horn of the medial meniscus extending to the inferior articular surface compatible with meniscal tear. The lateral meniscus is normal in signal and morphology.ARTICULAR CARTILAGE AND BONE: Increased T2 signal within the lateral femoral condyle, posterior tibial plateau, and the fibular head compatible with contusions with probable underlying microtrabecular fractures.Again noted is a broad-based central exostosis of the anterior metadiaphysis of the femur consistent with an osteochondroma.LIGAMENTS: The anterior cruciate ligament demonstrates abnormal increased signal as well as abnormal morphology compatible with a tear; a few fibers appear intact at the origin.The posterior cruciate ligament is intact. Grade 1 sprain of the medial collateral ligament; otherwise, the collateral ligaments are intact.EXTENSOR MECHANISM: The extensor mechanism is intact.ADDITIONAL
1.Findings consistent with anterior cruciate ligament tear.2.Vertical tear of the posterior horn of the medial meniscus.3.Osseous contusions with probable microtrabecular fractures as detailed.4.Large knee joint effusion.5.Grade 1 sprain of the medial collateral ligament.6.Sessile osteochondroma of the distal metadiaphysis of the anterior femur.