MSK MRI

Meniscal ramp lesions can be defined as longitudinal vertical and/or oblique peripheral tears in the posterior horn of medial meniscus, in a mediolateral direction of less than 2.0 cm, that may lead to meniscocapsular or meniscotibial disruption with a concomitant ACL injury. There are few classifications regarding meniscal ramp lesions. Thaunat et al. approached a more comprehensive classificat..

The subtype 4A is a complete longitudinal vertical tear of the red-red zone of the meniscus, The subtype 4B involves a complete tear of the junction itself where the meniscocapsular and meniscotibial fibers attach to the posterior horn. A very peripheral meniscal tear(ramp type 4A lesion) can mimic ramp type 4B lesion. (Type 4B ramp lesion) There are edema and irregularity of the meniscocapsular..

https://youtu.be/HLYXPEdQ9Mc The perimeniscal fluid, edema of the posterior capsule, or even normal structures can be mistaken for a ramp lesion. Let's look at the normal meniscocapsular junction and find out the difference between these lesions and ramp lesions. The meniscocapsular junction of the posterior horn of medial meniscus is composed of the meniscocapsular ligament superiorly and the m..

Finally, look at the type 5 ramp lesion. In this tear pattern, there are two separate tears within the red- red zone of the meniscus. So this is called a double tear. Type 5 ramp lesions are similar to type 4a. The subtype 4A is a complete longitudinal vertical tear of the red-red zone of the meniscus, with the meniscocapsular and meniscotibial ligaments intact but connected to a portion of the ..

Type 4 lesions involve a complete longitudinal vertical tear in the posterior horn of the meniscus, leading to meniscotibial ligament instability. There are two different subtypes of type 4 lesions in order to account for the instability pattern. The subtype 4A is a complete longitudinal vertical tear of the red-red zone of the meniscus, The second pattern (subtype 4B) involves a complete tear o..

Type 4 lesions as described by Thaunat et al. involve a complete longitudinal vertical tear in the posterior horn of the meniscus, leading to meniscotibial ligament instability as seen with type 3 lesions. To better account for the instability pattern seen with complete tears, Grief et al proposed further two subtypes of this type 4 ramp lesion. The subtype 4A is a complete longitudinal vertical..

Longitudinal tears of the posterior horn or meniscocapsular junction can propagate anteriorly into the meniscal periphery at the junction of body and posterior horn. There is only a partial separation of the meniscocapsular junction occurring as a continuation of a meniscal tear, producing a corner lesion. In this case, the sagittal image demonstrates the type 3A Ramp lesion, but this tear propa..

Meniscocapsular Separation is the tear of the supporting meniscotibial (coronary) or meniscofemoral ligaments typically at attachment to meniscus. Occasionally, there is only a partial separation of the meniscocapsular junction occurring as a continuation of a meniscal tear, producing a corner lesion. Left image: This meniscocapsular separation is type 3A ramp lesion which is partial peripheral ..

https://youtu.be/wGrw05qFUh0 There are two different subtypes of type 3 lesions in order to account for the meniscotibial ligament instability. Type 3A represents a vertical peripheral tear of the inferior margin of the posterior horn containing the attachment of the meniscotibial ligament. The other subtype (type 3B) is a tear of the meniscotibial ligament itself from its attachment to the post..

Type 3 lesions, also known as “hidden lesions,” occur in the most inferior portion of the posterior horn and are associated with meniscotibial ligament instability. They are not visible with the transnotch approach, but they may be suspected in case of mobility at probing. There are two different subtypes of type 3 lesions in order to account for the meniscotibial ligament instability. Type 3A r..