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MRI Appearance of Wrisberg Variant of Discoid Lateral Meniscus

Kush Singh1, Clyde A. Helms1, M. Todd Jacobs1 and Laurence D. Higgins2

1 Department of Radiology, Duke University Medical Center, Box 3808, Durham, NC 27710.
2 Department of Orthopaedic Surgery, Duke University Medical Center, Durham, NC.


Figure 1
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  		Fig. 1A —15-year-old boy with knee pain. Sagittal proton density-weighted image (TR/TE, 2,000/20; slice thickness, 4 mm; interslice gap, 0.4 mm; field of view, 14-16 cm; matrix, 256 x 192) of lateral discoid meniscus shows no normal meniscocapsular attachments (arrow).

 

Figure 2
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  		Fig. 1B —15-year-old boy with knee pain. Sagittal proton density-weighted image (using same parameters as for A) through posterior horn of lateral meniscus adjacent to A shows another body segment, consistent with discoid meniscus. Again note lack of normal meniscocapsular attachments (arrow).

 

Figure 3
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  		Fig. 1C —15-year-old boy with knee pain. Arthroscopic image shows posterior horn of lateral meniscus (M). Surgical probe is seen pulling on Wrisberg's ligament (W) and displacing hypermobile posterior horn of lateral meniscus off tibial plateau.

 

Figure 4
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  		Fig. 2A —62-year-old woman with lateral knee pain and joint line tenderness. Sagittal fast spin-echo T2-weighted image with fat satuation (TR/TE, 4,000/75; slice thickness, 4 mm; interslice gap, 0.4 mm; field of view, 14-16 cm; matrix, 256 x 192) shows vertically oriented posterior horn of lateral meniscus (arrow), indicating absence of attachment by meniscotibial (coronary) ligaments.

 

Figure 5
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  		Fig. 2B —62-year-old woman with lateral knee pain and joint line tenderness. Coronal fast spin-echo T2-weighted image with fat satuation (same parameters as for A) shows popliteal tendon (arrow) as it passes between posterior horn of meniscus and joint capsule. Note absence of meniscal struts or fascicles that should normally attach meniscus to capsule.

 

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