Four years after knee arthrodesis/fusion-I have a extremely -painful tibia. Thought I wouldn't have any pain, my surgeon told me no more pain. Could I have a fracture of tibia that doesn't show on x-ray? Could I have the arthrodesis surgery again? Rod used in my fusion surgery put in a bit off center, consequently my foot is turned inward, can this be fixed if old rod is removed & a new one inserted.