"Meniscal extrusion is measured from the outer meniscal edge to the proximal tibial margin. Extrusion
of the medial meniscus more than 3 mm is considered abnormal . This degree of extrusion can
be seen in patients who have advanced meniscal
degeneration, and various types of meniscal tear.
Although extrusion of the anterior horn or
body of the lateral meniscus sometimes is considered a normal variant , others consider extrusion of the lateral meniscus more than 1 mm to
be abnormal . Damage to the meniscus and
meniscal extrusion can be associated with cartilage
abnormalities and likely predisposes to the development of osteoarthritis."
References:
1.http://www.med.nyu.edu/pmr/residency/resources/Radiology/Rads%20clinics_MRI%20knee%20meniscus.pdf
2. radiology.rsna.org
3. eorif.com
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