Reason: ligament tear? History: reduced ROM, effusion, knee pain with walking after ski trip MENISCI: The lateral meniscus appears intact. There is increased signal abnormality within the posterior horn of the medial meniscus which extends to the tibial articular surface indicating an oblique tear.ARTICULAR CARTILAGE AND BONE: There is increased signal abnormality within the lateral femoral condyle and lateral aspect of the tibial plateau indicating bone contusions. There are also bone contusions within the medial femoral condyle and posterior aspect of the medial tibial plateau. There is decreased linear signal abnormality and bone marrow edema in the proximal fibula at the level of the insertion of the conjoined tendon, indicating a small nondisplaced avulsion fracture, best seen on image 27 of series 601. There is a subchondral impaction fracture in the lateral femoral condyle indicating a lateral notch sign. There is also linear decreased signal abnormality within the lateral aspect of the lateral tibial plateau which may represent a small nondisplaced subchondral fracture (image 19; series 601). There is superficial fraying of the articular cartilage along the medial facet of the patella. There is linear decreased signal abnormality along the medial facet of the patella likely representing a full-thickness articular cartilage cleft best seen on image 15 of series 401.LIGAMENTS: There is disruption of the ACL through its mid substance fibers. The PCL appears intact. There is increased signal abnormality and thickening of the MCL indicating a sprain. Other than the aforementioned small avulsion fracture of the fibula at the insertion of the conjoined tendon, the LCL appears intact.EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Disruption of the ACL through its mid substance fibers.2. Impaction fracture of the lateral femoral condyle with probable small nondisplaced subchondral fracture of the lateral tibial plateau.3. Small nondisplaced avulsion fracture of the fibula at the level of the insertion of the conjoined tendon.4. Oblique tear of the posterior horn of the medial meniscus.5. Full-thickness articular cartilage cleft along the medial facet of the patella.6. Moderate size joint effusion.7. MCL sprain and other findings as described above.