In reply to IanJackson: If you google for 'bone healing diets' or similar, there are other things you need in addition to calcium - and to help with Ca absorption. Boron (from apples), various vitamins, yeast and other stuff. The list is a bit scary as it prohibits a lot of stuff too - salt, sugar, alcohol, nicotine, fat, caffeine and more....
I did try a special diet for the first 2 weeks but it had no visible effect at my next x ray, so I went back to the usual unhealthy lifestyle...glad I'm not a smoker though - smoking seems to be the worst possible thing when you're trying to promote bone growth.