Meniscal root tear
Meniscal root tears are a type of meniscal tear in the knee where the tear extends to either the anterior or posterior meniscal root attachment to the central tibial plateau. They often tend to be radial tears extending into the meniscal root.
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Epidemiology
According to one source, they are thought to account for ~10% of all arthroscopic meniscectomies 5.
Pathology
While they can arise from a number of mechanisms, root tears are generally thought to be chronic 5.
Associations
- ACL tears are associated with posterior horn root tears of the lateral meniscus
Radiographic features
MRI
Best assessed on T2 weighted sequences. When it involves the posterior root, medial root tears are easier to diagnose than lateral root tears.
On medial posterior root tears there is often 2:
- shortening or absence of the root on sagittal images
- vertical fluid cleft on coronal fluid-sensitive (T2) images
On posterior root radial tears of the lateral meniscus, the appearance may be similar to radial tears in other locations.
For root tears in general, sagittal imaging may demonstrate a meniscal ghost sign.
Other features include:
- truncation sign on coronal images 4
- features meniscal extrusion on coronal plane 4
History and etymology
They were first described by M J Pagnani et al. in 1991 6.
Related Radiopaedia articles
Knee pathology
The knee is a complex synovial joint that can be affected by a range of pathologies:
- bone and cartilage
-
knee fractures
- distal femoral condyle fracture
- tibial plateau fracture (classification)
- patella fracture
-
avulsion fractures of the knee
- arcuate complex avulsion fracture (arcuate sign)
- anterior cruciate ligament avulsion fracture
- biceps femoris avulsion fracture
- iliotibial band avulsion fracture
- patella fracture
- posterior cruciate ligament avulsion fracture
- reverse Segond fracture
- Segond fracture
- semimembranosus tendon avulsion fracture
- Stieda fracturechronic avulsion injuries
- dislocation
- chondromalacia patellae
- osteoarthritis of the knee
- osteochondral defects
- osteochondritis dissecans of the knee
- patterns of bone bruise in knee injury
-
knee fractures
- ligaments
- anterior cruciate ligament tear
- anterior cruciate ligament ganglion cyst
- anterior cruciate ligament mucoid degeneration
- posterior cruciate ligament tear
- medial collateral ligament tear
- lateral collateral ligament tear
- medial patellofemoral ligament tear
- posterolateral corner injury
- posteromedial corner injury
- tendons
- meniscal lesions
- bursosynovial lesions
- fat pad
- popliteal fossa
- fascia
- alignment
- knee
- patellofemoral
- gamut