Medial Meniscus Extrusion on Knee MRI: Is Extent Associated with Severity of Degeneration or Type of Tear?

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Abstract
OBJECTIVE. The meniscus is considered “extruded” when it extends beyond the tibial margin. We hypothesize that severe degeneration, large radial tears, complex tears, and tears involving the meniscal root would alter meniscal stability and cause more substantial extrusion.MATERIALS AND METHODS. The knee MRI database at Thomas Jefferson University Hospital was searched for reports describing meniscal extrusion; MR images were reviewed retrospectively. On mid coronal images, extrusion of the medial meniscus was quantified in millimeters. A separate, independent review of the meniscus evaluated degeneration severity and tear (type and extent). Radial tears were divided into those involving more (large) or less (small) than 50% of the meniscal width. Tears that involved the “root” at the tibial spine were recorded. Chi-square analysis compared these findings with extrusion extent, divided into minor (≤ 3 mm) and major (> 3 mm) extrusion.RESULTS. One hundred five knees were reviewed (12 men and 93 women; age r...

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