Oh that's terrible - your poor husband having the joy of running taken away like that.
I'm lucky in that I found out how to fix my knee problems, and it looks like they are fixed for good. That's 20 years of pain that I didn't have to go through if only I had know how to fix it, gone.
Hopefully I won't have to go through what your poor hubby is going through. Give him a hug from me ;-)