32-year-old female patient with knee pain, effusion, clinical instability. Assess for ACL tear and MCL sprain. MENISCI: There is a complex, branching tear of the posterior horn of the lateral meniscus with truncation of the free edge indicating a radial tear as well as a large horizontal component that transects the meniscus from the periphery to the truncated free edge. The tear appears to extend to the root of the meniscus. The body and anterior horn of the lateral meniscus appear intact. The medial meniscus appears intact.ARTICULAR CARTILAGE AND BONE: There are contusions within the posterior aspect of the lateral tibial plateau and more anteriorly within the lateral femoral condyle. Additional contusion is noted of the posterior aspect of the medial tibial plateau. A cortically based intermediate signal intensity focus along the posterior aspect of the proximal tibial metaphysis may represent a healed nonossifying fibroma.There is focal increased signal intensity of the articular cartilage of the medial facet of the patella representing degeneration. Otherwise, the articular cartilage of the medial and lateral femoral compartments appears intact.LIGAMENTS: There is complete rupture of the anterior cruciate ligament. The posterior cruciate ligament is intact. There is also complete tear of the medial collateral ligament at the femoral attachment with surrounding edema. Edema extends distally along the medial retinacular structures. We do not confidently see the medial patellofemoral ligament or posterior oblique ligament and cannot confirm their integrity. Furthermore although the meniscotibial coronary ligament is visualized, the meniscofemoral coronary ligament is not seen and may be torn. There is mild increased signal intensity adjacent to and within the fibers of the lateral collateral ligament proper suggesting a sprain, but the distal fibers are intact and insert normally with the conjoined fascia of the biceps femoris. Mild edema is noted within the soft tissues medial to the fibular head but we see no discrete structural abnormality.EXTENSOR MECHANISM: Mild edema is noted within the subcutaneous tissues anterior to the tibial tuberosity, but the extensor mechanism is intact.ADDITIONAL
1. Tears of the anterior cruciate ligament and medial collateral ligament as described above.2. Complex tear of the lateral meniscus.3. Other findings as described above.