Ab initio Investigation of Adsorption Characteristics of Bisphosphonates   on Hydroxyapatite (001) Surface
  The structures of some bisphosphonates (clodronate, etidronate, pamidronate, alendronate, risedronate, zoledronate, minodronate) were obtained and analyzed, and their adsorption energies onto hydroxyapatite (001) surface were compared to find out ranking order of binding affinity, which shows that the adsorption energy is the largest for pamidronate, followed by alendronate, zoledronate, clodronate, ibandronate, the lowest for minodronate and etidronate. 
Mun-Hyok Ri and Yong-Man Jang and Chol-Jun Yu and Song-Un Kim
physics.chem-ph cond-mat.mtrl-sci