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A 25-year-old male with knee pain. (a) Proton density coronal image (repetition time, 3000 ms; echo time, 35 ms) of the knee at the mid-point demonstrates no definite extrusion of the medial meniscus. A medial collateral ligament tear is seen. (b) A proton density coronal image (repetition time, 3000 ms; echo time, 35 ms) 15 mm behind (a) shows a 26.2 mm transverse meniscus length. The meniscal extrusion transverse ratio was 0. An intact medial meniscus was confirmed arthroscopically.
