Get it fixed Bob. I've torn the medial meniscus in both knees. I know whereof I speak.
Tear 1, June 2006. I day post op
Start isometric exercises 2 days post op. Stationary bike 4 weeks post op. Gentle walking 8 weeks post op. First easy hike 3 months post op. First real hike 6 months post op. Full recovery, when I went out and stopped worrying ~ 1 year.
Tear 2, November 2007. 1 day post op
Same successful recovery schedule. No reoccurence after 3 years.
I had tons of warning for the first tear and ignored it all. Locking sensation. Soreness. Luckily I was at home when it finally (and agonisingly) tore. Not so lucky the second time when I had neither symptoms nor warning but identical agony. I told the story on SP you might remember. See http://www.summitpost.org/marooned-in-t ... ess/362627
This last could have cost me my life if we had been trapped by the same storm that had tragic consequences for the party ahead of us.
You do a lot of solo travel. Don't take the risk. Right now, you have a partial tear but it will get worse. Bite the bullet and get it seen to. I'm 64 and healed fine. A young whipper snapper like your should heal even faster.