Reason: Evaluate left knee for medial meniscus tear vs. MCL tear History: left knee pain MENISCI: There is blunting and linear signal abnormality within the posterior horn of the medial meniscus which extends to the femoral articular surface indicating a horizontal tear, new from prior examination. The anterior horn appears intact. The lateral meniscus appears intact.ARTICULAR CARTILAGE AND BONE: There is a focal full-thickness articular cartilage defect along the weightbearing surface of the medial femoral condyle above the posterior horn of the meniscus measuring approximately 5 mm in the AP dimension. There is partial-thickness articular cartilage degeneration along the weightbearing surface of the lateral femoral condyle, posteriorly. There is a near full-thickness to full-thickness articular cartilage cleft along the medial facet of the patella. There is superficial fraying of the articular cartilage along the lateral facet of the patella. There is subjective thinning of the articular cartilage affecting the patellofemoral articulation. There is increased signal abnormality within the medial femoral condyle and fluid sensitive sequences likely representing a bone contusion. No definite fracture line is identified at this time. There are tricompartmental osteophytes.LIGAMENTS: Note is made of postsurgical changes of prior ACL graft reconstruction. The graft appears intact. There is a very minimal amount of decreased signal abnormality along the anterior aspect of the graft which may represent minimal anterior arthrofibrosis, of questionable significance. The PCL is again noted to be buckled, but appears intact. The MCL and LCL appear intact.EXTENSOR MECHANISM: The extensor mechanism appears intact. There is thickening and intermediate signal intensity within the proximal fibers of the patellar tendon likely related to the patient's history of ACL graft reconstruction.ADDITIONAL
1. Horizontal tear of the medial meniscus.2. Full-thickness articular cartilage defects and articular cartilage degeneration as described above.3. Bone contusion within the medial femoral condyle.4. Surgical changes of prior ACL graft reconstruction. The graft appears intact. Other findings as described above.