The term 'knee cartilage' could refer to either the meniscus cartilage(s) or the articular cartilage.
Clarifying the meaning of knee cartilage
Knee 'cartilages' are the menisci, or shock absorbers of the knee. They should not really be referred to as cartilages because of confusion with articular cartilage, which is the gristle covering the ends of the bones of the knee.
Synonyms:
joint cartilage
articular cartilage
hyaline cartilage
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Relevant material -
eBook - Clearing up confusion about knee cartilage
eBook explaining the difference between articular cartilage and meniscus cartilage.