The nondisplaced component of a flap tear may demonstrate a changing slope contour of its superior surface.
Criteria for diagnosis of a flap tear based on sagittal images include:
* A vertical tear encompassing the inner third of the meniscus,either coapted or noncoapted
* Relative deficiency of the inner third of the inferior meniscal surface with associated blunting of the remaining inferior leaf
* A blunted free edge of the meniscus with displaced meniscal tissue inferior to the periphery of the meniscus A change in the slope of the superior surface of the meniscus,indicating a change in the direction of the tear that creates the flap.
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