19 year old male with lateral knee pain. MENISCI: The medial meniscus appears intact. There is a linear branching signal abnormality within the posterior horn of the lateral meniscus which extends to the tibial articular surface consistent with a complex tear including a horizontal and longitudinal component which extends to involve the body and anterior horn of the meniscus in a horizontal fashion.ARTICULAR CARTILAGE AND BONE: There is increased bone marrow signal abnormality within the lateral aspect of the tibial plateau consistent with a bone contusion. No full-thickness or near full-thickness articular cartilage defects are identified.LIGAMENTS: The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Complex tearing of the lateral meniscus and bone contusion of the tibial plateau as described above.2. Small joint effusion.3. Increased signal abnormality within the muscle belly of the popliteus, suggesting a muscle strain.