MRI of discoid lateral meniscus

We retrospectively reviewed the MR examinations of 10 patients (17 knees) with surgically documented discoid lateral meniscus of the knee joint. As MRI of the knee is being used more often, the criteria for diagnosis of this entity with MRI need to be established. We tried to define MRI criteria for...

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Bibliographic Details
Published inNihon Igaku Hoshasen Gakkai zasshi. Nippon acta radiologica Vol. 51; no. 10; p. 1189
Main Authors Araki, Y, Ootani, M, Furukawa, T, Yamamoto, T, Tomoda, K, Tsukaguchi, I, Mitomo, M
Format Journal Article
LanguageJapanese
Published Japan 25.10.1991
Subjects
Adolescent
Adult
Child
Female
Humans
Japan - epidemiology
Knee Joint - pathology
Magnetic Resonance Imaging
Male
Middle Aged
Retrospective Studies
Japan
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Summary:We retrospectively reviewed the MR examinations of 10 patients (17 knees) with surgically documented discoid lateral meniscus of the knee joint. As MRI of the knee is being used more often, the criteria for diagnosis of this entity with MRI need to be established. We tried to define MRI criteria for the detection of discoid menisci by performing numerical measurements of MR images on a display screen. The transverse diameter of the midbody of a discoid lateral meniscus averaged 21.9 mm (normal control: 8.6 mm), and its proportion to the transverse width of the tibia averaged 29.4% (normal control: 12.0%). The measurable difference in height between the discoid and the medial meniscus was negligible. The number of sagittal sections on which the anterior and posterior horns connected varied from two to five in cases of discoid lateral meniscus, and from zero to two in normal controls. Among these parameters, the transverse diameter and its proportion of the transverse width of the tibia proved to be the most reliable. We concluded that a discoid meniscus is indicated if a transverse diameter of a lateral meniscus exceeds 15 mm (proportion to the tibia: 20%).
ISSN:0048-0428