radialer Meniskusriss
Radial meniscal tears are a category of meniscal tear where the tear extends radially from the free edge of a meniscus across its short axis.
Terminology
Radial tears extend across the short axis of a meniscus perpendicularly to the tibial plateau and will extend in a radial orientation from the central intercondylar region. This is opposed to horizontal and vertical meniscus tears, which make up the other planes of meniscal tears. Transection is an alternative term for a complete radial tear.
Pathology
Complete radial tears will disrupt the hoop strength of the meniscus with resultant loss of function and meniscal extrusion. They tend to predominate at the:
- posterior horn of the medial meniscus
- junction of the anterior horn and body of the lateral meniscus
Radiographic features
MRI
Fluid cleft within the low signal meniscus extending from the central free edge towards the periphery, perpendicular to the articular surface.
The marching cleft sign indicates a parrot beak radial tear.
The ghost meniscus sign indicates a complete radial tear.
Treatment and prognosis
Often not repaired as will involve the central avascular zone of the meniscus and therefore in adults have a low likelihood of healing.
Differential diagnosis
A meniscal flounce can be mistaken for a radial tear .
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