Pathology:Meniscal bucket handle tear, with inner
meniscal fragment displaced into the intercondylar notch,
anterior to the PCL.Double PCL sign
occurs with medial meniscal tears only; the ACL prevents displacement
of lateral meniscal fragments into the intercondylar notch, anterior to
the PCL.
•
Imaging
findings:Band of low signal
intensity, anterior and parallel to the PCL, simulating the PCL (sagittal
view).Band of low signal intensity
within the intercondylar notch, between the PCL and tibial plateau;
associated truncation of triangular configuration of peripheral meniscus
(coronal view).
•
Note: The double
PCL sign tear may be considered as a subset of fragment-in-notch
type medial meniscal tears, in which the displaced fragment lies
in the same sagittal plane as the PCL.