Reason: prior ACL injury, r/o tear History: pain MENISCI: There is abnormal intermediate signal intensity within the periphery of the posterior horn of the medial meniscus which extends to the tibial articular surface, seen on multiple sequential sagittal images, indicating a longitudinal tear. The extent of the signal abnormality is slightly less than that seen on the prior study, which could reflect some interval healing. However, there is a small residual fluid-filled defect along the inferior fibers of the periphery of the posterior horn, along the lateral margin of this tear. We see no definite lateral meniscus tear.ARTICULAR CARTILAGE AND BONE: There are full-thickness articular cartilage defects involving the central portion of the femoral trochlea, appearing similar to the prior study. There are also partial thickness defects of the articular cartilage of the patella which are better seen on the current study than on the prior examination.LIGAMENTS: The proximal fibers of the anterior cruciate ligament are not well visualized and furthermore the slope of the distal fibers is abnormal and there appears to be slight anterior translation of the tibia relative to the long axis of the femur, suggesting a full-thickness tear. The PCL appears intact. The LCL and MCL appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Chronic rupture of the proximal fibers of the ACL.2. Tear of the posterior horn of the medial meniscus as described above. Other findings as described above.