15-year-old female with knee pain after sports. Evaluate for fracture. MENISCI: There is increased linear T2 signal in the posterior horn of the lateral meniscus extending to both articular surfaces (series 5, image 21) compatible with a tear. Additionally, there is diffusely increased signal within the posterior horn of the lateral meniscus as well as fluid tracking within the meniscus compatible with maceration. There is increased signal without evidence of extension to the articular surfaces in the anterior horn of the lateral meniscus compatible with degeneration.The medial meniscus is normal in signal and morphology.ARTICULAR CARTILAGE AND BONE: There is increased T2 signal within the femoral condyles, posterior tibial plateau, as well as the fibular head compatible with contusions with probable underlying microtrabecular fractures.LIGAMENTS: The anterior cruciate ligament is increased in signal and thickened in morphology compatible with a tear. Posterior cruciate ligament and the collateral ligaments are intact.EXTENSOR MECHANISM: The extensor mechanism is intact.ADDITIONAL
1.Torn anterior cruciate ligament.2.Macerated posterior horn of the lateral meniscus with evidence of a tear.3.Degeneration of the anterior horn of the lateral meniscus.4.Multiple osseous contusions with probable underlying microtrabecular fractures.5.Moderate-sized knee joint effusion.