Reason: Assess for lateral meniscal tear; assess ligament integrity History: Lateral knee pain on deep flexion, positive McMurray test MENISCI: There is a large fluid-filled complete longitudinal tear of the posterior horn of the medial meniscus extending into the body of the medial meniscus seen on 6 consecutive sagittal images. The anterior horn of the medial meniscus is intact. There is a thin band of linear intermediate signal intensity within the peripheral fibers of the posterior horn of the lateral meniscus extending to the femoral articular surface. Although the signal is continuous with the interface of the meniscofemoral ligament of Wrisberg and the posterior horn of the lateral meniscus, its lateral extension through the meniscus is suggestive of a true longitudinal tear (Wrisberg rip). Of note, the suspected tear is of intermediate signal intensity and may be healed. The anterior horn and body of the lateral meniscus appears normal.ARTICULAR CARTILAGE AND BONE: We see no articular cartilage defects.LIGAMENTS: The proximal fibers of the ACL are indistinct, which may represent an old tear; however there are no bone contusions to indicate a recent tear. The PCL and LCL complex are intact. EXTENSOR MECHANISM: The quadriceps and patellar tendons appear intact.ADDITIONAL
1. Large and likely unstable complete longitudinal tear of the medial meniscus.2. Poor definition of the proximal fibers of the ACL suggests prior injury/tear although we see no bone contusion on the current study to suggest recent injury.3. Findings suggestive of a partial thickness peripheral tear of the posterior horn of the lateral meniscus (Wrisberg rip). This tear is not fluid-filled and may be healed.