I had a bit of a setback, let it rest, then started doing rehab exercises, and in the last few days have started using my Vasa Trainer, a pulley type device for swimmers and surfers, which approximates paddling, and it felt OK. I'm gonna be able to surf again, not just sit on the beach or cliff and wistfully watch the action.
It was a dramatic change, in both function and mood.
The recoverability of the human body is awesome. Dr. Henry Bieler, in his great book "Food Is Your Best Medicine," has a chapter titled "The Magnificent Human Body." And so it is.
As to knees, I've had them both operated on. If I'd understood a few principles earlier on, I'd still be running The Dipsea Race. I wrecked the meniscus in each knee by too much fast downhill running. If' I'd saved the kamikaze downhilling for races, it would have been fine. But once I developed the coordination, I pounded every down hill, a lot of times racing friends, at times, hate to admit it, showboating.
Maybe you know this, but if not: the meniscus is a disc of cartilage in between the tibia and femur. It's a shock absorber and it can get shredded from overuse. When you hear someone talking about "bone on bone," they mean the meniscus is gone.
SO, brother and sister runners: respect thy meniscus. Get an MRI (free if you're over 65) to see what shape it's in. I quit racing because I want to be walking when I'm 100.