Meniscal root tear (annotated MRI)
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Edema seen at medial meniscal attachment anterior to PCL. The next section shows a "ghost meniscus"(red arrow) in posterior horn with an anteriorly displaced fragment (blue arrow)
Avulsions or tears of the meniscal root are uncommon, occurring in 2.2-9.8% of patients undergoing MRI of the knee. It is important to recognize these as the incidence of secondary osteoarthritis is high.