Symphysis, fibrocartilage, & the knee?

[Lindyhopper]

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Hi,
I've been researching but can't figure this out. If anyone can clear my confusion, I'm appreciative.
It seems that fibrocartilage is found in the knee, the pubic bones, & between vertebral bones. The pubic & vertebral bones are connected by a symphysis articulation. My confusion is the role the fibrocartilage in the synovial joint of the knee.
Thanks

 

[Lindyhopper]

Sorry I failed to notice that the meniscus is fibrocartilage. But feel more than free to elaborate.