Defect or fracture of a pars interarticularis, spondylolisthesis with greater than 4 mm of misalignment Having a glomerular filtration rate (GFR) less than 60 ml/min/1.73m 2 . Hypocalcemia, significant cardiac, hematological, renal, hepatic, metabolic, endocrinological disease Being pregnant or nursing Receiving Worker's Compensation, having a pending legal claim Weighing less than 45 kg Subjects who score 26 and above on the Beck Depression Inventory Prior pamidronate treatment patients who in the opinion of the study physician have poor oral hygiene, do not have regular dental care, had a tooth extraction or another invasive dental procedure within 3 months prior to study enrollment