Hmmm, I thought PRP was recommended for osteoarthritis, but it is sometimes recommended for a meniscus tear. If it's a significant tear in your meniscus, arthroscopy might be faster.

How do you know it's torn, or how badly it's torn? Does your knee lock up occasionally? If yes you probably need a scope. Or try PRP one more time, or try another surgeon for a 2nd opinion. Be well.