Is previous hyperthyroidism still a risk factor for osteoporosis in post-menopausal women?
OBJECTIVE: Hyperthyroidism is a risk factor for osteoporosis, but the relative contributions of the episode of hyperthyroidism and thyroxine replacement for subsequent hyperthyroidism remain uncertain. In this study we have measured bone mineral density (BMD) in post-menopausal women with a previous history of hyperthyroidism, comparing those requiring thyroxine therapy with those remaining euthyroid and with an historical local control population. DESIGN: Cross-sectional study. PATIENTS: One hundred and six post-menopausal women with a previous history of hyperthyroidism. These were divided into four groups: treated with radioiodine, remaining euthyroid (group RU, n = 15); treated with radioiodine, receiving thyroxine for at least 5 years (group RT, n = 46); treated with surgery, remaining euthyroid (group SU, n = 21); treated with surgery, receiving thyroxine for at least 5 years (group ST, n = 24). There were 102 control subjects. MEASUREMENT: Forearm bone mineral density at distal
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