Radial meniscal tear and ACL injury

Case contributed by Magdalena Chmiel-Nowak
Diagnosis certain

Presentation

A twisting injury a few weeks ago. Clinically anterior instability, extension deficit.

Patient Data

Age: 45 years
Gender: Male
This study is a stack
Sagittal
PD fat sat
This study is a stack
Coronal PD
fat sat
This study is a stack
Axial PD
fat sat
This study is a stack
Axial
T2
This study is a stack
Coronal
T1
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Info

There's a high-grade partial ACL tear, with torn fibers rolled up anteriorly to the Hoffa fat pad and concomitant bone bruises at locations typical for a pivot-shift injury. A complete radial tear of the posterior horn of the lateral meniscus is also visible, with separation of the torn edges and meniscal body extrusion.

Case Discussion

When a large radial meniscal tear transects the meniscus completely, it gives the appearance of a 'ghost meniscus' on sagittal MR images, with no visible meniscus on slices that course through the fluid gap.

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