Meniscal extrusion

Last revised by Henry Knipe on 4 Jan 2022

Meniscal extrusion or subluxation refers to the peripheral meniscal margin extending beyond the external aspect of the tibiofemoral compartment of the knee.


This can result from disruption of collagen fibers within the meniscus that provide hoop strength 8.


Radiographic features

Meniscal extrusion can be assessed reliably on ultrasound and MRI 5 as well as on CT 7. Significant meniscal extrusion has been variably defined as ≥3 mm 1 or ≥4 mm 6

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