Long-term disuse osteoporosis seems less sensitive to bisphosphonate treatment than other osteoporosis.
Li CY, Price C, Delisser K, Nasser P, Laudier D, Clement M, Jepsen KJ, Schaffler MB. Long-term disuse osteoporosis seems less sensitive to bisphosphonate treatment than other osteoporosis. J Bone Miner Res. 2005 Jan; 20(1):117-24.