Cadaver bone graft rejection symptoms in ankle?!? can this happen and what are the signs and symptoms?

Unlikely: Bone graft materials are not living tissues, rather they are processed bone fragments or powder and function only to allow ingrowth of new bone following a procedure. In this case, the bone is not antigenic and thus not prone to rejection (theoretically possible, but very unlikely). I would think that if you are having problems, you should see your orthopedic surgeon to assess the healing status