- Effect of once-yearly zoledronic acid on the spine and hip as measured by quantitative computed tomography: results of the HORIZON Pivotal Fracture Trial. Eastell, R., Lang, T., Boonen, S., Cummings, S., Delmas, P.D., Cauley, J.A., Horowitz, Z., Kerzberg, E., Bianchi, G., Kendler, D., Leung, P., Man, Z., Mesenbrink, P., Eriksen, E.F., Black, D.M. Osteoporos. Int (2010)