Lateral miniscus

About 17 years ago, at the age of 21, I had surgery on my left knee to repair a tear in the lateral miniscus. Apparently I had ripped it in a knee-twisting ski accident and ragged edges were causing pain when I walked and ran. The surgery was a complete success. I recovered quickly and have been very active running, bicycling and swimming since then. 2 years ago I began running much more, exclusively outside and on trails or cross-country primarily to avoid the stress of pavement of my body. I run on average 20 to 25 miles/week. Sometimes a bit more. And never extremely intensely. Everything had been going very well until about 2 weeks ago when I began having the same sort of pain from before the surgery 17 years ago.
I have not been doing anything out of the ordinary, no mileage increases or new terrain. I’ve always made a point of doing a fair amount of hill running but I’ve not increased the intensity lately.
What I am afraid of is that what cartilage was left (and the surgeon told me they shaved off about half of it) is wearing out or has roughened around the edges again. And I’m afraid i’ll have to stop running. What are my options nowdays? Surely the technology has changed in 17 years.
Is there synthetic cartilage available? I’ve heard about cadaver cartilage is there an issue with tissue matching? How long does it last? 17 years was not long enough I need 40 to 50 years. And what is the cost? I have good insurance which would probably pay for this but I feel a little guilty increasing medical costs for this sort of thing. On the other hand, I HAVE to be able to run and stay healthy for the rest of my life. Thank you,Amy