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Accuracy of 3-T MRI Using Fast Spin-Echo Technique to Detect Meniscal Tears of the Knee

R. Richard Ramnath1, Thomas Magee1, Nik Wasudev2 and Robert Murrah3

1 Neuroskeletal Imaging, 1344 S Apollo Blvd., Ste. 406, Melbourne, FL 32901.
2 Neuroskeletal Imaging, Orlando, FL.
3 Murrah Orthopedics, Orlando, FL.


Figure 1
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  		Fig. 1 —Sagittal proton density fast spin-echo image (TR/TE, 3,600/16; echo-train length, 6; 2-mm slice thickness; 0.2-mm gap; matrix, 416 x 256; auto-zero-fill interpolation [ZIP], 512; number of excitations [NEX], 2; 15-cm field of view) showing vertical tear (arrow) of posterior horn of medial meniscus confirmed at arthroscopy.

 

Figure 2
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  		Fig. 2A —A tear of medial meniscus not reported on MRI, but described as "tear" of posterior one half of meniscus at arthroscopy. Sagittal proton density fast spin-echo image (TR/TE, 3,600/16; echo-train length, 6; 2-mm slice thickness; 0.2-mm gap; matrix, 416 x 256; auto-zero-fill interpolation [ZIP], 512; number of excitations [NEX], 2; 15-cm field of view) showing fraying of free edge of posterior horn of medial meniscus (arrow), which was called tear at surgery, but not on MRI interpretation.

 

Figure 3
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  		Fig. 2B —A tear of medial meniscus not reported on MRI, but described as "tear" of posterior one half of meniscus at arthroscopy. Coronal T2-weighted fat-saturated fast spin-echo image (TR/TE, 3,400/55; echo-train length, 12; 4-mm slice thickness; 1-mm gap; matrix, 384 x 320; auto-ZIP, 512; NEX, 2; 16-cm field of view) showing fraying and mild blunting of free edge of body of medial meniscus (large arrow); this finding was seen only on one image. Horizontal tear of lateral meniscus (small arrow) was seen at MRI and arthroscopy.

 

Figure 4
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  		Fig. 3 —Sagittal proton density fast spin-echo image (TR/TE, 3,600/16; echo-train length, 6; 2-mm slice thickness; 0.2-mm gap; matrix, 416 x 256; auto-zero-fill interpolation [ZIP], 512; number of excitations [NEX], 2; 15-cm field of view) showing vertical signal abnormality in anterior horn of medial meniscus extending to both superior and inferior articular surfaces (arrow); this finding was seen on more than one image. This was described as vertical tear on MRI, but was not reported surgically. Patient motion slightly degrades image.

 

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