AlendronateAbsorptionBone Density Conservation AgentsIntestinal AbsorptionOsteoporosis, PostmenopausalEtidronic AcidDiphosphonatesBone DensityOsteoporosisBone RemodelingFractures, BoneTeriparatideFemoral FracturesBone ResorptionFemurBone and BonesSpinal FracturesAdministration, OralHydroxycholecalciferolsSkin AbsorptionRaloxifeneBiological AvailabilityFractures, SpontaneousTibiaCollagen Type IDrugs, GenericBone Diseases, MetabolicSpineBone Demineralization TechniqueLumbar VertebraeGeranyltranstransferaseClodronic AcidCalcification, Physiologic