Reason: meniscal tear History: knee instability with periodic locking or giving way with minimal activity. MENISCI: Branching signal abnormality within the posterior horn of the lateral meniscus extending to the body of the meniscus indicating a complex tear. This tear consists of a vertical-longitudinal component that extends to the periphery of the posterior horn, contacting the tibial articular surface on multiple consecutive sagittal images. The anterior horn of the lateral meniscus is intact without discrete tear. The medial meniscus is intact without discrete tear.ARTICULAR CARTILAGE AND BONE: We see no articular cartilage defect. Bone marrow signal intensity is within normal limits.LIGAMENTS: The proximal fibers of the anterior cruciate ligament are indistinct, likely representing a full-thickness tear, presumably chronic given the lack of bone contusions. The posterior cruciate ligament is intact. The medial collateral ligament is intact. The lateral collateral ligament complex is intact.EXTENSOR MECHANISM: The extensor mechanism is intact. ADDITIONAL
Chronic ACL tear and complex tear of the lateral meniscus as described above.