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- W1531886711 abstract "Despite only limited reports of a greater number of fractures during childhood or adulthood, osteoporosis historically has been described as a feature in Turner syndrome, because of the frequent observation of radiographic osteopenia and the coarse trabecular pattern of the carpal bones on radiographs. The pathogenesis of the skeletal demineralization remains unclear, but the data support the concept of an intrinsic bone defect that is then exacerbated by a number of hormonal factors, including the growth-regulating hormones, the gonadal steroids, and possibly the calcium-regulating hormones. The advent of more refined methods, such as single- and dual-photon absorptiometry and dual energy x-ray absorptiometry, has led to improved insights into bone mineral density (BMD) status in Turner syndrome (TS). A major limitation of these projection methods is that they report areal and not true volumetric BMD, resulting in an underestimation of the true BMD in smaller subjects. In assessing BMD in TS, various methods have been used to eliminate the confounding effect of bone size. Some consistent patterns do emerge in persons with TS who are not treated with long-term growth hormone (GH) or estrogen therapy. A significant deficit in cortical bone commonly appears in childhood and usually is associated with a low bone-turnover state. Significant osteopenia at predominantly trabecular sites develops during mid- to late adolescence and persists into adulthood, when it is associated with increased bone turnover. Preliminary BMD data on patients after long-term GH therapy show an absence of osteopenia. With respect to the impact of long-term estrogen therapy, the BMD deficit in adults with TS who have been treated adequately with estrogen, but who have not been treated with GH, is less than it is in those who have been insufficiently treated or not treated at all with estrogen. The available data indicate that long-term GH treatment during the prepubertal and early to midpubertal years optimizes BMD and improves the prognosis for adequate peak bone mass being achieved after a puberty that, most often, has been induced with exogenous estrogen. Long-term treatment with estrogen and progestin that is initiated during mid- to late adolescence and is continued throughout adulthood appears necessary for a normal peak bone mass to be achieved and the BMD to be preserved well beyond the time of peak bone mass. Additional measures to prevent osteoporosis must be used, such as ensuring adequate calcium intake and ample weight-bearing activities, focusing on preventing injuries and avoiding overtreatment with thyroid hormones. Long-term surveillance with measurement of BMD and of bone turnover in a large TS population into their later adult years is necessary before it can be concluded that the osteopenia observed in TS is a nonprogressive asymptomatic bone defect of no clinical consequences." @default.
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- W1531886711 date "1998-08-01" @default.
- W1531886711 modified "2023-10-05" @default.
- W1531886711 title "Turner Syndrome and Osteoporosis: Mechanisms and Prognosis" @default.
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- W1531886711 doi "https://doi.org/10.1542/peds.102.s3.481" @default.
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