The meniscus is relatively avascular in adults, except for the peripheral 10% to 25% of the meniscus supplied by the perimeniscal capillary plexus.
Notice, on sagittal fat-suppressed PD images, this focal high signal intensity of the peripheral portion of the medial meniscus is not torn, but perimeniscal capillary plexus.
The meniscus can be divided into red-red, red-white, and white-white zones.
- The #The red-red zone is the outer third of the meniscus and the peripheral 3mm of the meniscus, maintains an excellent blood supply.
- The #red-white zone is the mid-third of the meniscus, demonstrates variable vascularity, and receives nourishment from both blood supply and synovial fluid.
- The #white-white zone extends beyond 5mm from the periphery and represents the avascular inner portion (including the free edge) of the meniscus
- The white-white zone is avascular and receives its nutrition by the diffusion of synovial fluid
It's not a real patient's MRI, but they are virtual images very similar to the images in the journals. The images will be created for educational purposes.
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