42 year-old female with history of pain. LEFT KNEE: MENISCI: There is blunting of the free edge of the body of the lateral meniscus, however we see no fluid filled tears. The medial meniscus is slightly attenuated which may reflect chronic attritional tearing, but again we see no discrete fluid-filled tear.ARTICULAR CARTILAGE AND BONE: There is thinning of the articular cartilage of the patella and femoral trochlea indicating osteoarthritis. There is near full thickness degeneration of the articular cartilage of the lateral tibial plateau with relative sparing of the lateral femoral condyle and medial tibial femoral compartment. There is edema within the lateral tibial plateau extending into the intercondylar eminence of the tibia as well as the proximal tibial metaphysis. This is nonspecific, but we suspect this may be degenerative in etiology or the result of an occult subchondral fracture which is not well visualized on this study.The superior aspect of the femoral trochlea appears shallow along with prominence of the lateral facet suggesting femoral trochlear dysplasia. The tibial tuberosity to trochlear groove distance measures 14 mm, which is at the upper limits of normal. The Insall-Salvati ratio is 1.2, borderline.LIGAMENTS: The cruciate and collateral ligaments are intact. EXTENSOR MECHANISM: No significant abnormality noted.ADDITIONAL
Left Knee:1. Osteoarthritis predominantly affecting the patellofemoral and lateral tibiofemoral compartments with anatomic findings suggestive of femoral trochlear dysplasia.2. Edema within the proximal tibia is nonspecific and may be degenerative in etiology, although a small subchondral fracture is also a diagnostic consideration.Right knee:1. Osteoarthritis as above particular affecting the patellofemoral joint with anatomic findings which may predispose to patellofemoral instability.