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## Abstract ## Purpose To correlate MR exams showing meniscal extrusions >3 mm beyond the tibial margin with arthroscopic findings. Meniscal extrusion (>3 mm extension beyond the tibial margin) has been described on previous studies as having a high index of association with meniscal root tears. These previous studies were limited by a lack of exact arthroscopic correlation. We also assessed the prevalence of meniscal root tears on MR examinations without meniscal extrusions. ## Materials and Methods A retrospective review was performed of 300 consecutive knee MR exams of patients who went on to arthroscopy. All patients had a complete MR exam performed on a 3T GE MR scanner. MR exams were reviewed for medial meniscal extrusion >3 mm from the tibial margin. The exams with medial meniscal extrusion were reviewed for meniscal tears on MR exam. The exams without meniscal extrusion were reviewed for meniscal root tears. Results were subsequently correlated with arthroscopy. ## Results Of the 300 MR exams, 42 demonstrated medial meniscal extrusion >3 mm from the tibial margin. Of these 42 patients, 34 had meniscal degeneration, complex tear, or a large radial tear near to or involving t

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Author

Thomas Magee

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 1053-1807)

Published

2008

Language

EN

Field

Medicine (Health Sciences)