Reason: eval for L knee meniscus vs patellofemoral pathology History: L knee medial and lateral joint line pain, + patellar apprehension MENISCI: There is globular increased signal intensity throughout the anterior horn and body of the lateral meniscus indicating severe intrasubstance degeneration. There is extension of mucoid material into the adjacent soft tissues with parameniscal cyst formation. Additionally, however, there is linear signal extending both vertically through the anterior horn of the meniscus and horizontally to the femoral articular surface indicating superimposed complex tearing. Additional intrasubstance degeneration affects the posterior horn of the lateral meniscus and there is perhaps a tiny undersurface tear in the peripheral fibers near the attachment of the ligament of Wrisberg. There is minimal intrasubstance signal of the medial meniscus of doubtful clinical significance, but we see no discrete tear.ARTICULAR CARTILAGE AND BONE: We see no articular cartilage defects. The bone marrow signal intensity is within normal limits.LIGAMENTS: The ACL appears thinned, but appears intact. The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact. The Insall Salvati ratio is within normal limits.ADDITIONAL
Complex tear of the lateral meniscus with extensive underlying mucoid degeneration and other findings as described above.