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Radial Meniscal Tears: Significance, Incidence, and MR Appearance

Keith W. Harper1,2, Clyde A. Helms1, H. Stanley Lambert, III3 and Laurence D. Higgins4

1 Department of Radiology, Division of Musculoskeletal Radiology, Duke University Medical Center, Durham, NC 27701.
3 Department of Radiology, Duke University Medical Center, Durham, NC.
4 Department of Surgery, Division of Orthopedic Surgery, Duke University Medical Center, Durham, NC.



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  		Fig. 1A —Schematic diagrams show four signs for detecting radial meniscal tears. Truncated triangle sign.

 


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  		Fig. 1B —Schematic diagrams show four signs for detecting radial meniscal tears. Cleft sign.

 


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  		Fig. 1C —Schematic diagrams show four signs for detecting radial meniscal tears. Marching cleft sign.

 


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  		Fig. 1D —Schematic diagrams show four signs for detecting radial meniscal tears. Ghost meniscus sign.

 


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  		Fig. 2 —Truncated triangle sign indicates radial meniscal tear. T2-weighted fast spin-echo sagittal image (TR/TE, 4,000/70) with fat saturation shows abrupt termination (arrow) of normal triangular meniscal contour at tip of free edge of meniscus indicating radial tear in 49-year-old man.

 


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  		Fig. 3A —Cleft sign indicating radial meniscal tear. T2-weighted fast spin-echo coronal images (TR/TE, 4,000/70) with fat saturation show vertical high signal extending through menisci (arrows), revealing radial tears.

 


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  		Fig. 3B —Cleft sign indicating radial meniscal tear. T2-weighted fast spin-echo coronal images (TR/TE, 4,000/70) with fat saturation show vertical high signal extending through menisci (arrows), revealing radial tears.

 


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  		Fig. 3C —Cleft sign indicating radial meniscal tear. T2-weighted fast spin-echo coronal images (TR/TE, 4,000/70) with fat saturation show vertical high signal extending through menisci (arrows), revealing radial tears.

 


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  		Fig. 4A —Marching cleft sign in discoid lateral meniscus indicates radial meniscal tear in 21-year-old man. Conventional sagittal proton density image (TR/TE, 2,000/20) with fat saturation shows partial cleft (arrow) in most peripheral body segment.

 


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  		Fig. 4B —Marching cleft sign in discoid lateral meniscus indicates radial meniscal tear in 21-year-old man. Conventional sagittal proton density images (2,000/20) with fat saturation show vertical high signal (arrows) extending through adjacent two body segments, indicating cleft marching centrally and anteriorly indicating radial tear.

 


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  		Fig. 4C —Marching cleft sign in discoid lateral meniscus indicates radial meniscal tear in 21-year-old man. Conventional sagittal proton density images (2,000/20) with fat saturation show vertical high signal (arrows) extending through adjacent two body segments, indicating cleft marching centrally and anteriorly indicating radial tear.

 


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  		Fig. 5A —Ghost meniscus sign indicates radial meniscal tear. T2-weighted fast spin-echo sagittal image (TR/TE, 4,000/70) with fat saturation shows abnormal high signal in triangular shape (arrow) in place of normally low-signal posterior horn of meniscus.

 


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  		Fig. 5B —Ghost meniscus sign indicates radial meniscal tear. Conventional sagittal proton density image with fat saturation shows similar findings of high signal in shape of posterior horn of meniscus.

 


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  		Fig. 5C —Ghost meniscus sign indicates radial meniscal tear. T2-weighted fast spin-echo coronal image (4,000/70) shows cleft of high signal (arrows) traversing posterior horn of meniscus corresponding to same radial tear seen in orthogonal plane.

 


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  		Fig. 6 —Chart shows distribution of radial meniscal tears at arthroscopy. MED = medial, LAT = lateral.

 

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