The purpose of this study is to investigate whether these drugs slows bone healing, and what the relationship is between various bone studies - DEXA scanning, biochemical bone marker tests, radiographic controls and tissue examination of newly formed bone under a microscope. How sensitive and specific, each of the above study methods? If they are just as sensitive, the cheapest of them recommended as a routine investigation on suspicion of bone effects. Furthermore, to compare the benefit (pain-relieving effect, influence on rehabilitation) of these drugs and their possible harmful side effects (affected and delayed bone healing).