A discoid meniscus is an unusual meniscus variant, and is wider than the normal crescentic shape. Its presence may or may not be associated with symptoms.

discoid meniscus Discoid menisci are usually found on the lateral (outer) side of the knee. It may be present in just the one knee or both knees, and it is generally understood that the condition is genetic. Discoid menisci may cause 'snapping' sounds in the knee. Because their structure is also anomolous, they are more inclined to tear than a normal meniscus.
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A simple overview of the discoid meniscus and its clinical issues.

Discoid meniscus

An unusual anatomical variant.

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CLINICAL PUBLICATIONS

Discoid meniscus in children: treatment and outcome. Davidson D, Letts M and Glasgow R. Can J Surg. 2003 Oct; 46(5): 350–358.

Diagnosis and Treatment of Discoid Meniscus. Kim J-G, Han S-W and Lee D-H. Knee Surg Relat Res. 2016 Dec; 28(4): 255–262.