Abstract
Both hormone replacement therapy (HRT) and bisphosphonates are efficacious in the prevention and treatment of postmenopausal osteoporosis. Combined therapy with bisphosphonate and HRT is likely to be used in clinical practice, and limited data are available regarding its efficacy and safety. This was a 1-yr, double blind, placebo-controlled study in which 524 postmenopausal women received daily treatment with conjugated equine estrogens (0.625 mg) alone or in combination with risedronate (5 mg). Women who had not undergone hysterectomy received medroxyprogesterone acetate (up to 5 mg, daily or cyclically) at the discretion of the investigator. The primary efficacy end point was the percent change from baseline in mean lumbar spine bone mineral density (BMD) at 1 yr. Changes in BMD at the proximal femur and forearm, bone turnover markers, and histology and histomorphometry were also assessed. At 12 months, significant (P < 0.05) increases from baseline in lumbar spine BMD were observed in both treatment gr...
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