Allan:
I don't understand why your pharmacist said there is no bone growth in adults--they may not get longer (you don't get taller), but bone is living tissue and there is (or should be) turnover in the cells (like skin).
I have had an increase in bone density as measured by DEXA with Actonel and calcium and vitamin D supplements and my PCP said that he has patients with greater increases than mine.
I have not done the research but I too would question the effects of a once-a-year massive dose as opposed to weekly dosage. Your numbers seem to be right on the border between osteopenia and osteoporosis--I know you can be obsessive about these things (
), but maybe a consult with a rheumatologist to ask about options?