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of the Knee
– Broad and
– Frequent in Asian population 20%;
frequent in whites 0.5%
– 15-35 years; men
– More frequent laterally versus
– Different structure from the normal
– Different classification of discoid
An asymptomatic discoid meniscus does not need surgery|
Patients in MR: symptomatic – surgery
Is discoid? Lateral or medial?
• Tear or not?
Peripheral or not?
• Fixed or mobile meniscus?
• Visualization of the entire
meniscus (difficult to assess during arthroscopy)
Visualization of horizontal and inferior tears that can be missed by
MR criteria of diagnosis
diameter of lateral meniscus 11-12 mm
2 adjacent sagittal images (5 mm) that displays equal or nearly equal
– 3 adjacent sagittal images (5 mm)
that displays continuity between anterior and posterior horn
abnormal shape on coronal images (height)
structure and clinical impact|
The number and the orientation of the collagen fibers
responsible for tears and degeneration
Atay OA et al. Am J
Sports Med 2007;35:475
– Normal meniscus:
dense collagen fibers centrally circular oriented
at the outer surface radially oriented fibers – anchor to
– Discoid meniscus:
lower collagen concentration=degenerated meniscus
loss of normal orientation
Clinical impact: 38-88% tears in
Treatment: partial meniscetomy
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