36-year-old female. Pain with popping sensation and knee. ? meniscal tear. Due to the patient's body habitus, a knee coil could not be used. A flex coil was used instead, which results in slightly suboptimal image quality. Additionally, there is limited evaluation of multiple sequences due to motion artifact.MENISCI: The lateral half of the posterior horn of the medial meniscus is replaced with abnormal signal intensity indicating a large tear, likely a root avulsion. This is associated with mild medial extrusion of the body of the medial meniscus. A focus of fat signal intensity within the remaining fibers of the posterior horn may represent a meniscal ossicle. The anterior horn of the medial meniscus appears intact. The lateral meniscus appears intact.ARTICULAR CARTILAGE AND BONE: Evaluation of the articular cartilage is suboptimal due to the aforementioned limitations. Moderate to severe osteoarthritis affects the patellofemoral joint with findings suggestive of full-thickness cartilage loss along the patella. There also appears to be near full thickness to full thickness cartilage loss along the medial femoral condyle and medial tibial plateau anterior to the posterior horn of the medial meniscus. Relatively mild cartilage degeneration affects the lateral tibiofemoral compartment cartilage. Foci of edema within the tibial plateau are likely degenerative in etiology.LIGAMENTS: The ACL is thickened and of increased signal intensity; we suspect this reflects mucoid degeneration with a tear considered less likely. The PCL is intact. Edema along the superficial band of the MCL could represent a sprain in the correct clinical context but may also be seen in patients with underlying meniscal tears and osteoarthritis. The lateral collateral ligamentous complex appears intact.EXTENSOR MECHANISM: The patellar and quadriceps tendons are intact. There is nonspecific edema in the subcutaneous fat anterior to the patellar tendon.ADDITIONAL
1. Limited study, as described above.2. Large tear of the posterior horn of the medial meniscus, as described above, suggestive of a root avulsion.3. Osteoarthritic changes and other findings, as described above.