35-year-old female with pain on walking. Knee "gives away." Evaluate for torn meniscus or ligament. MENISCI: Lateral and medial menisci are intact.ARTICULAR CARTILAGE AND BONE: There is bone marrow edema within the anterior aspect of the lateral tibial plateau as well as subchondral edema within the lateral aspect of the lateral femoral condyle which likely represents bone contusion. There is a poorly defined, band-like focus of low signal intensity within the subchondral lateral femoral condyle which may represent a small, nondisplaced subchondral fracture, but this is equivocal. Overlying cartilage appears intact as well as the articular cartilage of the knee.LIGAMENTS: The ACL is intact. The PCL is intact. The MCL is intact. The LCL is intact. There is mild edema within the fat deep to the iliotibial band which likely represents direct contusion. EXTENSOR MECHANISM: The extensor mechanism is intact.ADDITIONAL
Edema within the lateral femoral condyle and lateral tibial plateau suggests bone contusion with a small, equivocal subchondral fracture of the lateral femoral condyle and other findings as above. We see no meniscal or ligamentous injury.