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Fig. 1. —Proven normal patellofemoral cartilage in 20-year-old woman college basketball player with knee pain after fall who was found at surgery to have tear of anterior cruciate ligament. Axial fast spin-echo proton density-weighted MR image shows anterior cruciate ligament tear, seen as absence of anterior cruciate ligament fibers at its site of attachment on lateral femoral condyle (straight black arrow). Cartilage surfaces were normal. Signal intensity of hyaline cartilage (short white arrows) is intermediate between that of joint fluid (curved arrow) and that of cortical bone (long white arrows).