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Fig. 2A. —18-year-old woman soccer player with anterior knee pain. Sagittal fast spin-echo T2-weighted MR image (TR/TE, 4000/69) with fat suppression through intercondylar notch shows curvilinear high T2 signal along course of infrapatellar plica (arrow). Fluid signal immediately anterior to anterior cruciate ligament in intercondylar notch may be related to infrapatellar plica avulsion or may simply represent joint fluid. Other findings on MR imaging included discoid lateral meniscus and mediopatellar plica (not shown). At arthroscopy (not shown), infrapatellar plica was thickened and avulsed from its femoral attachment, and redundant infrapatellar plica interfered with full extension. Infrapatellar plica was resected; after surgery, patient was asymptomatic and resumed playing soccer.