I will ask that posters refrain from posting specifics about Sam's (or any player's) personal medical information. Federal privacy laws protect such information, and I am not aware that any specific diagnosis or information about Sam's ankle problems have ever been released publically. So to speculate with such rumors as "no one specifically knows what is wrong", and "the ankles were "stable" IOW no structural damage" are not fair to Sam, and from what I have heard, are not even accurate.
Unless posters can verify the source for such information, rumors regarding Sam's medical issues will be limited to what is publically released.