discoid meniscus

discoid meniscus
discoid lateral meniscus a semilunar lateral meniscus of the knee that has been transformed into a thickened, irregular discoid mass as a result of excess motion of the meniscus, which in turn results from congenital absence of attachment of the posterior horn of the meniscus to the tibial plateau. The excess motion also causes a clicking sound on flexion and extension of the knee. Occasionally, a discoid medial meniscus is observed. Called also congenital discoid meniscus.

Medical dictionary. 2011.

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