47-year-old female with left knee pain, evaluate for a medial meniscal tear. MENISCI: There is a complex tear of the medial meniscus including a radial tear which begins along the free edge of the posterior horn and extends though the junction of the posterior horn and body. It is difficult to determine whether the peripheral-most fibers are intact or spared. There is additional signal abnormality within the body and posterior horn of the medial meniscus, indicating a combination of intrasubstance degeneration and horizontal tearing. There is also medial extrusion of the body of the medial meniscus. The meniscofemoral coronary ligament is not well-visualized and may be torn. The meniscotibial coronary ligament appears thickened likely reflecting degeneration. The lateral meniscus is intact.ARTICULAR CARTILAGE AND BONE: There is near-full-thickness to full-thickness loss of cartilage along the weightbearing surface of the medial femoral condyle between the meniscal horns. There also appears to be thinning of the articular cartilage along the far medial aspect of the medial tibial plateau, with mild edema-type signal in the underlying bone. The articular cartilage of the lateral and patellofemoral compartments is intact.LIGAMENTS: There is edema along the superficial band of the medial collateral ligament. This could represent a sprain in the correct clinical context, but we suspect that is secondary to the aforementioned medial compartment pathology. The lateral collateral ligament complex intact.EXTENSOR MECHANISM: The extensor mechanism is intact.ADDITIONAL
1. Complex tear of the medial meniscus as described above including a near-complete to complete radial component.2. Medial compartment articular cartilage degeneration.3. Large joint effusion and other findings as described above.