Sorry to hear it, Danger, but good luck! You have been a good friend, hope to run (or hobble) into you again!
As for me and my unflappable left knee, the latest is: torn meniscus; meniscus separated from bone; torn cartilage; cartilage fragments floating around in knee joint; Large Baker's Cyst, ruptured and leaking into calf cavity; Inflamed Tibia (where the cartilage was torn off). Very painful, surgery scheduled and Ortho guys says 12 weeks recovery.
Guess it's time to resurrect my Rock'n'Roll career....bummer.
Good luck to all.
Piston