Reason: acl tear? Meniscal pathology? History: pain after popping injury on 4/14 MENISCI: There is globular signal without a discrete linear component seen in the posterior horn of the lateral meniscus, consistent with intrasubstance degeneration. The medial meniscus is intact.ARTICULAR CARTILAGE AND BONE: There is patchy red marrow signal within the distal femur and proximal tibia, which appears appropriate for the patient's age. There is a partial-thickness tear of the articular cartilage at the apex of the patella. There is thinning and heterogeneous signal within the articular cartilage of the medial femoral condyle with underlying bone changes. More pronounced thinning is seen along the anterior aspect of the lateral femoral condyle. Multiple well-defined cystic areas are seen within the lateral femoral condyle and proximal tibia, which likely represent subchondral cysts. Edema-type signal is seen within the lateral tibial plateau, consistent with a bone contusion.LIGAMENTS: There is complete disruption of the ACL with retraction. Thickening of the MCL with surrounding fluid signal is consistent with a sprain. Otherwise, the remaining ligaments are intact.EXTENSOR MECHANISM: No significant abnormality noted.ADDITIONAL
1. Complete tear of the ACL with moderate joint effusion and bone contusion.2. MCL sprain. 3. Moderate to near severe osteoarthritis of the knee. 