31-year-old female with right knee locking. MENISCI: There is marked attenuation of the medial meniscus, particularly of the body and posterior horn. This may be due to extensive partial meniscectomy, but if there is no history of prior surgery then this represents extensive tearing of the medial meniscus. We see no fluid signal entering the remainder of the medial meniscus to confirm a tear if there has been prior meniscectomy. A small focus of intermediate signal intensity along superior aspect of the remainder of the posterior horn of the medial meniscus may represent scar tissue or additional degenerated meniscal tissue. The lateral meniscus appears intact.ARTICULAR CARTILAGE AND BONE: We see no fluid-filled articular cartilage defect. The bone marrow signal is within normal limits..LIGAMENTS: The ACL is intact. Fibers of the PCL can be traced from the femur to the tibia, but the PCL appears attenuated, likely from prior tear. The LCL and MCL are intact.EXTENSOR MECHANISM: The quadriceps and patella tendons are intact. Subjectively the femoral trochlea appears shallow, suggesting dysplasia with slight lateral translocation of the patella relative to the center of the trochlea. The medial retinacular structures appear normal. Mild thickening of the iliotibial band may reflect prior surgical scarring.ADDITIONAL
1. Medial meniscal abnormalities as described above, either reflecting prior meniscectomy or extensive tearing; please correlate with surgical history.2. Thinning of the PCL, which may reflect prior injury.3. Findings suggestive of mild femoral trochlear dysplasia with mild lateral translation of the patella.