Sodium monofluorophosphate increases vertebral bone mineral density in patients with corticosteroid-induced osteoporosis
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Corticosteroid-induced osteoporosis, which particularly affects the axial skeleton and the proximal femur, is characterized by a state of low bone remodelling. Fluoride is a potent stimulator of trabecular bone formation which could potentially be useful in the treatment of corticosteroid-induced osteoporosis. We investigated the effects of sodium monofluorophosphate (26 mg/day of fluoride) combined with 1000 mg of calcium (MFP-calcium-treated group), or of calcium alone (control), given for 18 months, on bone mineral density (BMD) of lumbar spine (LS), femoral neck (FN) and midfemoral shaft (FS) in 48 patients with corticosteroid-induced osteoporosis. Mean ages were 49.4±3.1 and 51.6±3.0 years (mean± SEM), duration of corticosteroid therapy 7.5±1.8 and 9.3±1.7 years, and mean daily dose of prednisone 18.2±2.3 and 12.1±1.1 mg in the MFP-calcium-treated group and controls, respectively. Initial BMDs (expressed as theZ-score, i.e. the difference in standard deviations from age- and sex-matched normal subjects) were −1.5±0.2 and −1.2±0.2 for LS, −1.4± 0.2 and −1.3±0.2 for FN, and −0.8±0.3 and −0.6±0.3 for FS, in the MFP-calcium-treated group and controls, respectively. Analysis by linear regression of 6-monthly measurement values revealed BMD changes of +7.8 ±2.2 versus + 3.6±1.3% (p<0.02) for LS, −1.5±1.8 versus +0.9 ±1.8% for FN, and −1.1±1.1 versus −0.5±1.4% for FS after 18 months of follow-up in the MFP-calcium-treated group and controls, respectively. For comparison, 17 patients with idiopathic osteoporosis (mean age 63.9±2.0 years), with initial BMDs of −1.3±0.4, −1.6±0.3 and −0.8±0.4 (Z-score for LS, FN and FS, respectively), received MFP and calcium for 22.1±1.7 months. BMD changes in idiopathic osteoporosis were +9.3±2.7% (p<0.005), −1.3±2.0% and +0.6± 0.9% for LS, FN and FS, respectively. These results indicate that the combination sodium monofluorophosphate and calcium was more efficient than calcium alone in increasing lumbar spine BMD in patients with corticosteroid-induced osteoporosis; neither femoral neck nor femoral shaft BMD was affected. Moreover, these effects were similar in patients with corticosteroid-induced and idiopathic osteoporosis.
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- Sodium monofluorophosphate increases vertebral bone mineral density in patients with corticosteroid-induced osteoporosis
Volume 5, Issue 1 , pp 39-46
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- 1. Division of Clinical Pathophysiology (World Health Organization Collaborating Center for Osteoporosis and Bone Disease), Department of Medicine, University Hospital of Geneva, Geneva, Switzerland
- 2. Division of Nuclear Medicine, Department of Radiology, University Hospital of Geneva, Geneva, Switzerland