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Identifying subtle instability of the discoid lateral meniscus on sagittal magnetic resonance imaging in the absence of obvious displacement. (A) Absence of popliteomeniscal fascicle (blue arrowhead) indicates insufficiency of the meniscocapsular attachment posteriorly. (B) Increased signal adjacent to the posterior horn alone with popliteomeniscal fascicle (yellow arrow) is not a sign of posterior instability.
