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Fig. 3. —38-year-old woman with skiing injury. Sagittal fast spin-echo T2-weighted MR image (TR/TE, 4000/67) with fat suppression through knee 6 months after injury shows fluid signal along course of infrapatellar plica (arrows) interpreted as torn anterior cruciate ligament with associated rupture of infrapatellar plica. At arthroscopy 2 months later (not shown), scar tissue was found in expected position of infrapatellar plica, suggesting that plica had been injured.