《anatomy》cartilage
《food, cooking》nankotsu; (dish of) gristle (usu. of chicken, deep-fried)
軟骨の唐揚げ、追加でどう？
How about another order of crispy fried chicken cartilage?
膝の軟骨が少し磨り減っていますね。
The cartilage in your knee has worn down a bit.
関節の軟骨は一度減ると元には戻らない。
Once joint cartilage wears down, it doesn't recover.