I have noticed that the "leathers" seem to be getting thicker, they were really thin when we first got him. The way I understand it from research is that by taping them up it forces more blood into them or something. The cartiledge thing is probably right on. I have also read that they can be "broken" by other dogs chewing on them & other things when young. We are very strict to keep Wickett from chewing on Bentleys ears when they play. We also massage them whenever possible, although he doesn't hardly stay still longer enough to do any good.
It seems that if they were able to stand once they should be able to again. Maybe I am just not being patient enough...that never was one of my stronger virtues
Thanks to all of you for your ideas and experiences, keep 'em coming!!