Double ACL sign
*Pathology:  Meniscal bucket handle tear, with inner meniscal fragment displaced into the intercondylar notch, anterior and lateral to the ACL.  Double ACL sign commonly occurs with lateral meniscal bucket handle tears.
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*Imaging findings:  Band of low signal intensity, anterior and lateral to the ACL (sagittal view).  Because of the oblique orientation of the ACL, the meniscal fragment may parallel and simulate the ACL when viewed on oblique sagittal orientation.  Band of low signal intensity may be seen within the intercondylar notch, parallel to the ACL; associated truncation of triangular configuration of peripheral meniscus (coronal view).
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*Note: The double ACL sign tear may be considered as a subset of fragment-in-notch type meniscal tears, in which the displaced fragment lies in the same sagittal plane as the PCL.